Expand Section 7.3 — Tree Nut Butter Comparison: comprehensive lipid and antinutrient deep-dive. Replaces brief stub with structured comparison covering hazelnut, cashew, almond (full per-nut profiles), plus walnut/pecan/pistachio/Brazil. Lipid profile table for all 5 main nut butters with bis-allylic/peroxidation theory (4-HNE, MDA, isoprostanes, cardiolipin damage cycle). Antinutrient mechanism deep-dives: phytate (IP6 chelation chemistry, mineral binding constants, phytate:zinc ratios, mitigation), oxalate (kidney stones + PDH/Complex II inhibition + Oxalobacter formigenes microbiome interaction), lectins (PNA T-antigen binding), tannins, mycotoxin sources (aflatoxin B1 hepatocarcinogenesis, TP53 R249S signature). Hazelnut: oleic dominance, source-dependent aflatoxin (Turkey vs Italy/Oregon). Cashew: high SFA/stearic mitochondrial fusion benefit, oxalate concern. Almond: borderline-to-avoid analysis (24% PUFA, 469mg/100g oxalate, 140:1 phytate:zinc ratio, LDL-trial framing critique). Final ranking table 1-5 with mitigation strategies for sub-optimal choices. 15 references.

DIET.md

@@ -2231,25 +2231,345 @@ From a cost-per-health-benefit standpoint, the case is strong: you are removing
 
 ---
 
-### 7.3 Other Tree Nuts — Almonds, Walnuts, Cashews, Pecans, Hazelnuts, Pistachios
+### 7.3 Tree Nut Butter Comparison — Lipid Profiles and Antinutrients
 
-**Detailed analysis:** Pending
+Beyond peanut butter (Section 7.1) and macadamia butter (Section 7.2), the most commonly consumed tree nut butters are hazelnut, cashew, and almond. Each occupies a distinct niche in the framework — hazelnut is the runner-up to macadamia, cashew is a moderate compromise, and almond is borderline-to-avoid despite its dominant cultural status as the "healthy" nut. Walnut, pecan, and pistachio butters complete the tree nut category but are best treated as occasional foods, not staples. This section establishes the comparative framework across both lipid composition and antinutrient burden, then provides per-nut deep dives.
 
-*Brief:* Tree nuts vary enormously in fatty acid profile. Ranked by framework alignment (omega-6 content):
+#### 7.3.1 Comprehensive Lipid Profile (per 100g nut butter)
 
-| Nut | Oleic acid (MUFA) | Linoleic acid (n-6) | Framework alignment |
-|-----|-------------------|--------------------|--------------------|
-| **Macadamia** | ~60% | **~2%** | **Strongly aligned** (see Section 7.2) |
-| **Hazelnut** | ~78% | ~13% | Good — high oleic, moderate LA |
-| **Cashew** | ~60% | ~17% | Acceptable — moderate LA |
-| **Almond** | ~66% | ~25% | Borderline — significant LA |
-| **Pistachio** | ~51% | ~31% | Poorly aligned — high LA |
-| **Pecan** | ~40% | ~32% | Poorly aligned — high LA |
-| **Walnut** | ~13% | **~52%** | **Avoid as a fat source** — seed oil in shell form |
+| Nut Butter | Total Fat | SFA | MUFA | PUFA (mostly LA) | PUFA % of fat | Notes |
+|------------|-----------|-----|------|-----------------|---------------|-------|
+| **Macadamia** | 76g | 12g (16%) | 59g (78%) | 1.5g | **~2%** | Lowest PUFA of any common nut; ~16-21% palmitoleic acid (lipokine) |
+| **Hazelnut** | 61g | 4.5g (7%) | 46g (76%) | 8g | ~13% | Highest oleic % of any nut (~78% of fat as oleic) |
+| **Cashew** | 46g | 9g (20%) | 27g (60%) | 8g | ~17% | Highest SFA of nuts considered here; lower total fat |
+| **Almond** | 55g | 4.2g (8%) | 35g (63%) | 13g | ~24% | Significant LA contribution per serving |
+| **Peanut** | 50g | 10g (20%) | 25g (50%) | 16g | **~32%** | Highest PUFA; legume not nut; aflatoxin-prone (Section 7.1) |
+| Walnut (ref) | 65g | 6g (9%) | 9g (14%) | **47g** | **~72%** | Essentially walnut oil in nut form — avoid |
+| Pecan (ref) | 72g | 6g (8%) | 41g (57%) | 22g | ~31% | Pecan butter ~31% PUFA, similar to peanut |
+| Pistachio (ref) | 46g | 5.5g (12%) | 24g (52%) | 14g | ~31% | Equivalent PUFA to peanut |
 
-**Brazil nuts** are a special case — modest fat profile (~25% LA) but the richest food source of selenium (1-2 nuts provide ~100-200 mcg, sufficient for GPx4 selenoprotein synthesis). Worth including for selenium regardless of the PUFA.
+**Mechanistic foundation — why PUFA matters:**
 
-No tree nut has the aflatoxin susceptibility of peanuts (though almonds can occasionally be contaminated). No tree nut has a lectin as problematic as PNA.
+Linoleic acid (LA, 18:2 omega-6) is the dominant PUFA in tree nuts. The framework concern is not the omega-6:omega-3 ratio in isolation but the **absolute incorporation of LA into mitochondrial membrane phospholipids** — particularly cardiolipin, the inner mitochondrial membrane phospholipid that organises the electron transport chain supercomplexes. Tetralinoleoyl-cardiolipin (containing 4 LA chains) is the dominant cardiolipin species in human cardiac mitochondria. When this LA undergoes peroxidation (initiated by the very ROS generated at Complex I/III), it produces:
+
+- **4-Hydroxynonenal (4-HNE)** — a reactive aldehyde that forms Michael adducts with cysteine, lysine, and histidine residues on Complex IV (cytochrome c oxidase) and ANT (adenine nucleotide translocator)
+- **Malondialdehyde (MDA)** — a similar aldehyde that crosslinks proteins
+- **Isoprostanes** — non-enzymatic prostaglandin analogues that contribute to vasoconstriction and platelet activation
+
+The reaction is autocatalytic: peroxidation of one LA chain in cardiolipin generates ROS that propagate to neighbouring chains. The damaged cardiolipin loses its capacity to organise supercomplexes, electron leak increases, ATP synthesis declines, and the cycle accelerates. Macadamia (~2% PUFA) sits in a class of its own; hazelnut (~13%) is acceptable; almond (~24%) and peanut (~32%) measurably increase the LA load with daily consumption.
+
+**Bis-allylic positions and oxidisability:** The relative rate of peroxidation scales with the number of bis-allylic methylene groups (CH2 between two double bonds):
+
+| Fatty acid | Double bonds | Bis-allylic positions | Relative oxidation rate (oleic = 1) |
+|-----------|-------------|----------------------|------------------------------------|
+| Stearic (18:0) | 0 | 0 | 0 (not oxidisable) |
+| Oleic (18:1 n-9) | 1 | 0 | 1 |
+| Palmitoleic (16:1 n-7) | 1 | 0 | 1 |
+| **Linoleic (18:2 n-6)** | 2 | 1 | **~40** |
+| Alpha-linolenic (18:3 n-3) | 3 | 2 | ~98 |
+| Arachidonic (20:4 n-6) | 4 | 3 | ~150 |
+| EPA (20:5 n-3) | 5 | 4 | ~200 |
+| DHA (22:6 n-6) | 6 | 5 | ~250 |
+
+A gram of LA contributes ~40x the peroxidation potential of a gram of oleic acid. This is why the *fraction* of fat as PUFA matters more than total fat content. Macadamia delivers 24g of fat per 32g serving but only ~0.5g of PUFA. Almond delivers 17g of fat per 32g serving but ~4g of PUFA — eight times the LA load.
+
+#### 7.3.2 Comprehensive Antinutrient Profile (per 100g)
+
+| Nut Butter | Phytate (mg) | Oxalate (mg) | Lectins | Tannins | Mycotoxin Risk |
+|------------|-------------|--------------|---------|---------|----------------|
+| **Macadamia** | 150-200 | 40-70 | Negligible | Low | Very low |
+| **Cashew** | 200-500 | ~260 | Moderate | Low (no skin) | Low-moderate |
+| **Hazelnut** | 600-1000 | 20-200 | Low-moderate | High (skin) | Moderate-high (Aspergillus, esp. Turkish) |
+| **Almond** | 1100-1500 | **~469** | Moderate | High (skin) | Moderate |
+| **Peanut** | 1500-1700 | ~187 | **Very high (PNA)** | High (skin) | **Very high (aflatoxin B1)** |
+| Walnut (ref) | 600-800 | ~74 | Low | High (skin) | Low-moderate |
+| Pecan (ref) | 800-1100 | ~69 | Low | High (skin) | Low (rare *A. flavus*) |
+| Pistachio (ref) | 350-500 | ~10 | Low | Low | Moderate (aflatoxin in Iranian sources) |
+| Brazil (ref) | 1500-2000 | ~50 | Low | Moderate | Low (selenium issue dominates) |
+
+**Note on values:** Antinutrient content varies significantly with cultivar, growing conditions, processing, and laboratory method. The ranges above represent typical published values; individual brands may differ. Soaking, sprouting, fermentation, and roasting all reduce phytate by 20-50% (with sprouting being most effective), but these processes are rarely applied to commercial nut butters.
+
+#### 7.3.3 Antinutrient Mechanisms — What Each Compound Actually Does
+
+**Phytic acid (myo-inositol hexakisphosphate, IP6):**
+
+Phytate is the storage form of phosphorus in plant seeds. Each molecule has six phosphate groups attached to the inositol ring, giving it 12 negative charges at physiological pH. This dense negative charge makes IP6 an aggressive chelator of divalent cations:
+
+- **Zinc (Zn2+)** — the binding constant for IP6-Zn is high enough that significant phytate consumption (>500 mg per meal) demonstrably reduces zinc absorption. The phytate:zinc molar ratio is the more useful predictor: ratios above 15:1 substantially impair absorption. Almond butter at 1.2g phytate per 30g serving with ~0.9 mg zinc gives a ratio of ~140:1 — extreme.
+- **Iron (Fe2+, Fe3+)** — non-heme iron (the form in plants and supplements) is heavily impacted; heme iron from animal sources is largely unaffected. This is one mechanism behind the iron deficiency observed in vegan diets despite higher gross iron intake.
+- **Calcium (Ca2+)** — moderate impact; less severe than zinc and iron because gut calcium absorption involves both passive (vitamin D-dependent) and active transport pathways.
+- **Magnesium (Mg2+)** — modest impact; magnesium absorption is typically efficient enough to overcome moderate phytate loads.
+
+**Mitigation:**
+- **Soaking** (8-12 hours in slightly acidic water with a pinch of salt): activates intrinsic phytase enzymes in the nut; reduces phytate by 20-40%
+- **Sprouting** (24-72 hours after soaking): activates phytase further; reduces phytate by 50-75%
+- **Roasting**: paradoxically destroys phytase enzymes without breaking down phytate itself — roasted nuts retain higher phytate than soaked-then-dehydrated ("activated") nuts
+- **Co-consumption with vitamin C**: improves iron bioavailability against phytate blockade
+- **Co-consumption with calcium-rich foods**: precipitates phytate-calcium complexes that can reduce phytate's binding to other minerals (though calcium is itself reduced)
+- **Fermentation** (sourdough, traditional preparations): phytase from microbial activity degrades phytate substantially
+
+**Counter-perspective:** IP6 has been studied as an anticancer agent (Vucenik & Shamsuddin, 2006) — at supplemental doses taken away from food, it chelates free transition-metal iron, reducing Fenton chemistry and oxidative stress. The distinction is dose, timing, and context: phytate bound to a meal blocks mineral absorption; phytate taken between meals can serve as a free-radical-quenching antioxidant. Both can be true. The framework concern is the meal context.
+
+**Oxalates (oxalic acid, calcium oxalate, sodium oxalate):**
+
+Oxalate is a small dicarboxylic acid (HOOC-COOH) that forms exceptionally stable crystals with calcium (Ksp ~10^-9). The clinical and bioenergetic concerns:
+
+- **Kidney stones** — calcium oxalate stones are the most common type (~80% of all kidney stones). High-oxalate diets significantly increase stone risk in susceptible individuals. Almond at ~469 mg/100g is in the same range as spinach (~750 mg/100g) and rhubarb (~570 mg/100g) — the upper tier of oxalate foods.
+- **Vascular calcification** — oxalate crystals can deposit in vascular endothelium, contributing to atherosclerosis. The molecular mechanism involves direct cytotoxicity to vascular smooth muscle cells and complement activation.
+- **Joint deposition** — calcium oxalate crystals can deposit in synovial fluid, contributing to a pseudogout-like inflammatory arthritis (oxalate arthropathy, particularly in renal failure).
+- **Mitochondrial toxicity** — and this is the underappreciated bioenergetic mechanism: **oxalate is a potent inhibitor of pyruvate dehydrogenase (PDH)**. PDH catalyses the irreversible step from pyruvate to acetyl-CoA, the gateway from glycolysis to oxidative phosphorylation. Oxalate also inhibits succinate dehydrogenase (Complex II) at higher concentrations. Sustained high oxalate intake plausibly reduces mitochondrial glucose oxidation capacity.
+- **Brain deposition** — primary hyperoxaluria patients show calcium oxalate deposits in brain tissue at autopsy. The clinical relevance of dietary oxalate to brain deposition in healthy individuals is unclear but plausible at high intake.
+
+**Risk modifiers:**
+- **Dietary calcium** — calcium binds oxalate in the gut lumen, forming insoluble calcium oxalate that passes through unabsorbed. This is the rationale for "eat oxalate foods with dairy" — a 200-300 mg calcium serving with a high-oxalate meal can reduce oxalate absorption by 50-80%. The opposite intuition (avoid calcium to "make room" for oxalate) is exactly wrong.
+- **Gut microbiome** — *Oxalobacter formigenes* is a gut commensal that uses oxalate as its sole carbon source, degrading dietary oxalate before absorption. Antibiotic use depletes this organism (particularly cephalosporins, fluoroquinolones, and tetracyclines), increasing oxalate absorption for months to years afterward. Patients with prior heavy antibiotic use are at substantially elevated risk from high-oxalate diets.
+- **Vitamin B6 (pyridoxal-5-phosphate)** — cofactor for the enzyme that converts glyoxylate (an oxalate precursor) to glycine; B6 deficiency increases endogenous oxalate production. Adequate B6 status is protective.
+- **Magnesium** — modest competitor with calcium for oxalate binding; magnesium oxalate is more soluble than calcium oxalate, so high-magnesium status may shift the equilibrium favourably.
+
+**Lectins (carbohydrate-binding proteins):**
+
+Lectins are a diverse class of proteins that bind specific carbohydrate structures. Most dietary lectins are denatured by cooking and digestion. The exceptions matter:
+
+- **Peanut agglutinin (PNA)** — galactose-binding lectin, exceptionally heat-stable, survives gastric acid and pancreatic proteases. PNA can be detected intact in serum after peanut consumption, demonstrating gut barrier translocation. PNA binds the Thomsen-Friedenreich antigen (T-antigen) exposed on the surface of activated platelets, vascular endothelium, and certain tumour cells. Wang et al. (1998, *Lancet*) and subsequent work have implicated PNA in vascular inflammation and possible enhancement of metastatic spread of colon and breast cancers expressing T-antigen.
+- **Tree nut lectins** — present at lower levels and generally less heat-stable than PNA. Cashew has a moderate lectin content (anacardin, related to the urushiol family). Almond contains amandin and several minor lectins. Hazelnut contains corylin. None have been characterised as having the specific receptor binding and disease association of PNA.
+- **Macadamia** — uniquely free of significant lectin content. This is genuinely unusual for an edible plant seed.
+
+**Mitigation:** Roasting (typical commercial nut butter processing) denatures most tree nut lectins effectively but does NOT denature PNA. The "natural unroasted" peanut butter that is otherwise framework-aligned (no added oils, no sugar) actually has *more* PNA than roasted peanut butter — the framework verdict on peanut butter as a category is independent of the natural-vs-conventional debate.
+
+**Tannins (proanthocyanidins, condensed tannins):**
+
+Tannins are polymerised flavonoid compounds concentrated in nut skins. Dual nature:
+
+- **Negatives:** Bind digestive enzymes (alpha-amylase, trypsin, lipase) reducing macronutrient digestibility. Strongly bind non-heme iron (forming insoluble iron-tannin complexes) — a primary mechanism for the iron-blocking effect of tea, coffee, and high-tannin nuts. May also bind certain polyphenols and amino acids.
+- **Positives:** At dietary doses without nutrient interference, tannins have antioxidant, anti-inflammatory, and antimicrobial properties. Some tannins (e.g., proanthocyanidin B2 in hazelnut skin) have shown vascular benefits in isolation.
+
+**Practical impact:** Blanched nuts (skin removed) — typical for almond and hazelnut commercial preparation — have substantially lower tannin than whole-skin nuts. If you want the antioxidant benefit of tannins without the nutrient interference, eat them at a separate meal from iron-rich foods.
+
+**Mycotoxins (aflatoxin B1, ochratoxin A):**
+
+- **Aflatoxin B1** — produced by *Aspergillus flavus* and *A. parasiticus*, two soil-borne fungi that colonise grains and legumes during damp post-harvest storage. Aflatoxin B1 is among the most potent known hepatocarcinogens (IARC Group 1). Mechanism: hepatic CYP3A4 bioactivates AFB1 to AFB1-8,9-epoxide, which forms covalent adducts with N7-guanine in DNA. The signature mutation is the TP53 R249S transversion, found in 50%+ of hepatocellular carcinomas in high-aflatoxin regions. There is no known safe threshold; risk is cumulative and dose-dependent.
+- **Peanut is the dominant dietary source** by an enormous margin in Western diets, due to the legume's growth pattern (developing in soil contact rather than tree-borne) and storage practices (often warm, humid post-harvest conditions). Brazil regulatory data shows ~30-50% of peanut butter samples contain measurable aflatoxin; ~5-10% exceed regulatory limits.
+- **Hazelnut** — secondary aflatoxin source, particularly Turkish-grown (which dominates the global hazelnut market and supplies most of Nutella's hazelnuts). Italian and Oregon hazelnuts have lower contamination rates due to drier climates and stricter post-harvest handling.
+- **Pistachio** — Iranian pistachios historically had high aflatoxin contamination; California pistachios have much lower rates due to mechanical harvesting and rapid drying.
+- **Almond** — moderate risk; California almonds are mostly low-contamination due to industrial processing standards.
+- **Macadamia** — minimal risk due to hard shell, dry tropical processing, and industry consolidation in Australia/Hawaii.
+- **Cashew** — naturally low-moisture and steam-processed for shell removal, which kills surface fungi.
+- **Walnut, pecan** — low risk; the high tannin content of the husk may have antimicrobial effect.
+
+**Mitigation for peanut specifically:** Organic peanut butter is **not** lower in aflatoxin than conventional — organic standards do not address aflatoxin contamination. Brand and source matter more than organic certification:
+- Valencia peanuts (grown in arid New Mexico): consistently low aflatoxin
+- Single-source brands with published testing (e.g., Smucker's Natural, ARTISANA, Once Again Nut Butter): generally meet limits
+- Generic store-brand peanut butter from southeastern US sourcing: highest contamination rates
+- Refrigeration after opening slows additional fungal growth in the jar
+
+**Other compound-specific concerns:**
+
+| Compound | Concern | Highest in |
+|----------|---------|-----------|
+| Anacardic acid | Urushiol family compound (poison ivy/oak/sumac chemistry) — irritant, allergenic | Cashew (raw shell — removed in commercial processing via steam-roasting) |
+| Salicylates | Salicylate intolerance, AERD (aspirin-exacerbated respiratory disease), eczema | Almond, peanut |
+| Goitrogenic isothiocyanates | Mild thyroid interference (compete with iodine for thyroid uptake) | Peanut (modest) |
+| Cyanogenic glycosides (amygdalin) | Hydrogen cyanide release on hydrolysis | Bitter almond (sweet/dessert almond very low — commercial almond butter is from sweet almonds) |
+| Arginine:Lysine ratio | High arginine (low lysine) may promote HSV reactivation in herpes-prone individuals; pro-viral effect | Peanut, almond, hazelnut, walnut |
+
+#### 7.3.4 Hazelnut Butter — The Closest Macadamia Substitute
+
+Hazelnuts (*Corylus avellana*, *C. maxima*) come in second to macadamias on lipid profile alone — and significantly closer than the peanut-vs-macadamia comparison would suggest.
+
+**Lipid profile** (per 100g hazelnut butter):
+- Total fat: ~61g
+- Oleic acid (MUFA): ~46g (~76% of total fat, ~78% of monounsaturated content)
+- Linoleic acid (PUFA n-6): ~8g (~13% of fat)
+- Palmitic acid (SFA): ~3g (~5% of fat)
+- Stearic acid (SFA): ~1.4g (~2% of fat)
+- ALA (PUFA n-3): ~0.1g (~0.2% — essentially absent)
+- Palmitoleic acid: ~0.1g (~0.2% — far less than macadamia)
+
+**The oleic acid story:** Hazelnut has one of the highest oleic acid percentages of any plant food (~76% of total fat). Hazelnut oil has been studied as a substitute for olive oil with similar or superior lipid panel effects (Alasalvar et al. 2009; Tey et al. 2013). The 13% PUFA is six times higher than macadamia but still less than half of peanut, almond, or pistachio.
+
+**Tocopherol content:** Hazelnuts are exceptionally high in alpha-tocopherol (~15 mg per 100g — meeting the daily RDA in 100g). This vitamin E content protects the modest PUFA fraction from peroxidation in storage and provides a meaningful contribution to systemic vitamin E status.
+
+**Other micronutrients:**
+- Manganese: ~6 mg per 100g (260% DV) — SOD2 cofactor (mitochondrial superoxide dismutase)
+- Copper: ~1.7 mg per 100g (190% DV) — Complex IV assembly
+- Magnesium: ~163 mg per 100g (39% DV)
+- Folate: ~113 mcg per 100g (28% DV) — relevant for MTHFR-impaired individuals
+- B6: ~0.56 mg per 100g (33% DV)
+- Thiamine: ~0.64 mg per 100g (53% DV) — PDH cofactor
+
+**Antinutrients:**
+- Phytate: 600-1000 mg/100g — moderate-high; substantially blocks zinc and non-heme iron when consumed with meals
+- Oxalate: variable (literature ranges 20-200 mg/100g) — generally moderate
+- Tannins: high in skin (proanthocyanidin B2 dominant); blanched hazelnut butter has much lower tannin
+- Lectins: low to moderate (corylin) — heat-denatured by typical roasting
+- Aflatoxin: moderate to high risk depending on source
+
+**Source matters substantially for hazelnuts:**
+- **Turkey** (~70% of global production): higher aflatoxin contamination; supplies most commodity hazelnut products including Nutella
+- **Italy** (Piedmont DOP region): tighter handling standards; lower aflatoxin
+- **Oregon/USA** (~3-5% of global production): industrial-scale moisture monitoring; lowest aflatoxin
+- **Australia** (small but growing): high quality, low aflatoxin
+
+Practical recommendation: pay attention to country of origin if available; prefer Italian or Oregon-sourced hazelnut butter over generic/Turkish.
+
+**Framework verdict — hazelnut butter:** A reasonable substitute for macadamia at lower cost. The 13% PUFA is meaningfully higher than macadamia but well below almond (24%) and peanut (32%). Daily 30g serving adds ~2.4g LA — modest but not negligible. Source quality matters for aflatoxin risk. Manganese, copper, vitamin E, and thiamine contributions are nutritionally meaningful.
+
+#### 7.3.5 Cashew Butter — The Moderate Compromise
+
+Cashews (*Anacardium occidentale*) are technically a drupe seed (not a true nut), botanically related to mango and pistachio. The cashew "apple" produces a single seed below it; the seed shell contains urushiol-family compounds (anacardic acid) requiring heat processing for removal.
+
+**Lipid profile** (per 100g cashew butter):
+- Total fat: ~46g (lower than other tree nuts)
+- Oleic acid (MUFA): ~27g (~60% of fat)
+- Linoleic acid (PUFA): ~8g (~17% of fat)
+- Palmitic acid (SFA): ~5g (~11% of fat)
+- Stearic acid (SFA): ~4g (~9% of fat) — notably high for a nut
+- Palmitoleic acid: ~0.2g (~0.4%)
+
+**The SFA distinction:** Cashew has the highest saturated fat fraction of the common nuts (~20% of total fat as SFA, vs ~7% for hazelnut). The stearic acid contribution is particularly relevant to the framework: stearic acid promotes mitochondrial fusion via Mfn2 stabilisation (Senyilmaz-Tiebe et al., 2018), supporting mitochondrial network integrity. The palmitic acid is metabolically neutral when consumed in the context of a stearate/oleate-balanced diet.
+
+**Carbohydrate content:** Cashew has the highest carbohydrate of these nuts (~30g per 100g, of which ~3g is sugar and ~3g fibre). This makes cashew butter taste sweeter than other nut butters and gives it a more carbohydrate-shifted macronutrient profile. For ketogenic or low-carb approaches, this matters; for general framework eating, it is neutral.
+
+**Other micronutrients:**
+- Copper: ~2.2 mg per 100g (244% DV) — highest of the common nuts
+- Magnesium: ~292 mg per 100g (70% DV) — among the best plant sources
+- Iron: ~6.7 mg per 100g (37% DV) — though non-heme, blocked by phytate
+- Zinc: ~5.8 mg per 100g (53% DV)
+- Manganese: ~0.8 mg per 100g (35% DV)
+- Vitamin K1: ~34 mcg per 100g (28% DV)
+
+**Antinutrients:**
+- Phytate: 200-500 mg/100g — moderate; lower than almond, hazelnut, walnut
+- **Oxalate: ~260 mg/100g — substantially elevated**; second only to almond among common nut butters. Concerning for kidney-stone-prone individuals or those with depleted *Oxalobacter formigenes* status (post-antibiotic).
+- Tannins: low (no skin retained in commercial processing)
+- Lectins: moderate; heat-denatured by steam-processing
+- Anacardic acid: removed by commercial steam-roasting; raw cashews have residual amounts
+- Aflatoxin: low (steam processing kills surface fungi)
+
+**Sustainability note:** Cashew processing is labour-intensive and largely done in India and Vietnam under conditions that have raised labour-rights concerns. The cashew nut shell liquid (CNSL) released during processing is caustic and causes burns to processing workers without adequate protective equipment. Fair-trade cashews are available at premium price.
+
+**Framework verdict — cashew butter:** Acceptable as an occasional food. The 17% PUFA is moderate; the high SFA (including stearic acid) is mildly favourable. The oxalate content is the main concern — daily 30g cashew butter delivers ~78 mg oxalate, more than a moderate spinach serving. For most people this is fine; for kidney-stone-prone or post-antibiotic individuals, limit frequency. Pair with calcium-containing foods to reduce oxalate absorption.
+
+#### 7.3.6 Almond Butter — The Borderline-to-Avoid "Healthy" Nut
+
+Almonds (*Prunus dulcis*) dominate the cultural narrative of "healthy nuts" through aggressive industry marketing (the California Almond Board has spent decades promoting almonds as cardiovascular-protective). The clinical trial evidence does support modest LDL reduction with almond consumption (Berryman et al. 2017; Lee et al. 2017), but the framework analysis differs significantly from the conventional view.
+
+**Lipid profile** (per 100g almond butter):
+- Total fat: ~55g
+- Oleic acid (MUFA): ~35g (~63% of fat)
+- Linoleic acid (PUFA): ~13g (~24% of fat)
+- Palmitic acid (SFA): ~3.4g (~6% of fat)
+- Stearic acid (SFA): ~0.7g (~1% of fat)
+- ALA: ~0.01g (essentially zero)
+- Palmitoleic acid: ~0.3g (~0.6%)
+
+**The PUFA load:** A 30g serving of almond butter delivers ~3.9g linoleic acid. In the context of a framework-aligned diet aiming for ~2-4g LA per day (matching estimated ancestral intake), a single serving of almond butter substantially exceeds the daily target. Daily almond butter consumption pushes LA intake to 4-6g per day from this source alone, before considering other sources.
+
+**Vitamin E (alpha-tocopherol):** Almonds are exceptionally high (~25 mg per 100g, ~167% DV per 100g, ~50% DV per 30g serving). This is the strongest nutritional argument for almonds — the alpha-tocopherol content protects the LA against peroxidation in vivo and contributes meaningfully to systemic vitamin E status. However, alpha-tocopherol-only supplementation can suppress gamma-tocopherol levels (which has independent benefits), and the Mediterranean diet vitamin E benefit is primarily attributed to mixed tocopherols from olive oil rather than concentrated alpha-tocopherol from almonds.
+
+**Other micronutrients:**
+- Magnesium: ~270 mg per 100g (64% DV)
+- Manganese: ~2.3 mg per 100g (100% DV)
+- Calcium: ~270 mg per 100g (21% DV) — notable for a non-dairy source, though largely blocked by oxalate
+- Riboflavin (B2): ~1.1 mg per 100g (85% DV)
+- Copper: ~1.0 mg per 100g (110% DV)
+
+**The riboflavin point:** Almond is one of the better plant sources of riboflavin, the precursor to FAD and FMN — cofactors for the electron transport chain (Complex I uses FMN; Complex II uses FAD). However, riboflavin is also abundant in dairy, eggs, and organ meats, where it is not accompanied by 24% PUFA.
+
+**Antinutrients — the substantial concerns:**
+
+- **Phytate: 1100-1500 mg/100g** — second only to peanut among nuts. A 30g serving delivers ~330-450 mg phytate. With ~0.9 mg zinc per 30g, the phytate:zinc molar ratio is ~140:1, far above the 15:1 threshold for substantially impaired zinc absorption. Daily almond butter consumption is plausibly contributing to zinc deficiency, particularly in vegetarians/vegans without compensating animal-source zinc.
+
+- **Oxalate: ~469 mg/100g** — the highest of any common nut butter. A 30g serving delivers ~141 mg oxalate, comparable to a medium serving of spinach. Daily almond butter consumption alone delivers oxalate at the level historically associated with kidney stone risk. Almond skin contains the highest oxalate concentration; blanched almond butter has ~30-40% lower oxalate but still substantial.
+
+- **Tannins (skin, where retained):** High; binds non-heme iron and digestive enzymes.
+
+- **Salicylates:** Almonds are among the higher-salicylate foods. Relevant for AERD, salicylate intolerance, eczema, and some autism spectrum dietary protocols.
+
+- **Aflatoxin:** Moderate risk; California almonds have lower contamination than imports but are not aflatoxin-free.
+
+- **Cyanogenic glycosides (amygdalin):** Sweet almonds (commercial dessert/eating almonds) contain trace amounts (~0.1-0.5 mg/g amygdalin). Bitter almonds (used historically for marzipan extracts and cyanide poisoning case reports) contain ~50x more (5-50 mg/g) and cannot be sold whole in many jurisdictions. Commercial almond butter from sweet almonds carries negligible cyanide risk.
+
+- **Salmonella:** All almonds sold in the US (since 2007) are pasteurised by either steam treatment or propylene oxide (PPO) fumigation due to historical *Salmonella* outbreaks. Steam-pasteurised almonds are preferable; PPO is a Class 2B carcinogen (residues are claimed to be below detection by manufacturers, but the process is contested). "Raw" almonds in the US are not actually raw — only Italian and other imported almonds bypass this requirement, and some California organic raw almonds (small farms exempted) are available.
+
+**The almond LDL studies:** Berryman et al. (2017, *J Am Heart Assoc*) showed daily almond consumption (43g/day) reduced LDL by ~5-7 mg/dL over 6 weeks. Multiple similar trials show comparable results. The mechanism is partly fibre (modest), partly phytosterol displacement of cholesterol absorption, and partly displacement of other foods. Within the framework, this LDL reduction is not a marker of metabolic improvement — it is a marker of reduced cholesterol absorption, which is upstream of (and frequently independent of) the underlying metabolic state. Achieving LDL reduction by adding 4g/day of LA is the wrong trade.
+
+**Framework verdict — almond butter:** Borderline-to-avoid. The 24% PUFA load is the dominant concern; the ~141 mg oxalate per serving and ~400 mg phytate per serving compound the issue. The vitamin E and riboflavin contributions can be obtained from better sources (animal foods, olive oil, whole eggs) without the LA, oxalate, and phytate burden. The cultural status of almonds as the "healthy nut" reflects industry marketing more than framework analysis. If consumed, prefer blanched (lower oxalate, lower tannin) and use sparingly.
+
+#### 7.3.7 Walnut, Pecan, Pistachio — Brief Treatment
+
+**Walnut butter:**
+- ~72% PUFA — essentially walnut oil in spread form. Avoid as a fat source.
+- Contains ALA (~9-13% of fat) — the only common nut with meaningful omega-3
+- The omega-3 argument is undermined by ALA→DHA conversion being <0.5% in men; achieving meaningful DHA from walnut requires absurd intake
+- **Verdict:** Avoid as a regular food. If using walnuts, treat as a small flavour addition (1-2 walnuts), not a fat source.
+
+**Pecan butter:**
+- ~31% PUFA, comparable to peanut and pistachio
+- Distinctive flavour, moderate antioxidant content
+- Lower aflatoxin risk than peanut
+- **Verdict:** Better than peanut but still high-PUFA. Use sparingly.
+
+**Pistachio butter:**
+- ~31% PUFA, similar to peanut
+- Distinctive green colour from chlorophyll and lutein/zeaxanthin (carotenoids — eye health)
+- Iranian pistachios historically high aflatoxin; California pistachios much lower
+- **Verdict:** Carotenoid content is interesting but not unique (egg yolk delivers more lutein/zeaxanthin without the PUFA). Use sparingly.
+
+**Brazil nut:**
+- ~25% PUFA (high)
+- **Selenium content is the unique value proposition**: 60-90 mcg per nut, average — single nut provides daily selenium requirement; 2 nuts saturate selenoprotein synthesis
+- High selenium relevant for: glutathione peroxidase 4 (GPx4) capacity, mercury chelation (HgSe formation — see MERCURY_DETOXIFICATION.md), thyroid hormone deiodination (DIO1, DIO2, DIO3), iodothyronine selenodeiodinase activity
+- **Risk:** Selenium toxicity threshold (~400 mcg/day) can be reached by 4-5 Brazil nuts; chronic high intake associated with selenosis (hair loss, brittle nails, garlic breath, neuropathy)
+- **Verdict:** Eat 1-2 Brazil nuts per day for selenium — a discrete supplemental food, not a snack to consume freely. The PUFA load from 1-2 nuts is acceptable given the selenium benefit. Brazil nut *butter* is not appropriate (delivers far too much selenium per serving).
+
+#### 7.3.8 Final Ranking — Framework-Aligned Nut Butters
+
+| Rank | Nut Butter | Verdict | Rationale |
+|------|-----------|---------|-----------|
+| **1** | **Macadamia** | **Strongly aligned** | Lowest PUFA (~2%), lowest oxalate, lowest phytate, lowest aflatoxin risk, lowest lectin. Palmitoleic acid lipokine bonus. Cost is the only drawback. |
+| **2** | **Hazelnut** | **Aligned, second choice** | Excellent oleic % (~76%); 13% PUFA acceptable; high vitamin E; manganese/copper/thiamine. Source matters for aflatoxin (prefer Italian/Oregon over Turkish). |
+| **3** | **Cashew** | **Acceptable, occasional** | High SFA (including stearic — pro-mitochondrial fusion); 17% PUFA moderate. Main concern: oxalate (260 mg/100g). Pair with calcium. |
+| **4** | **Almond** | **Borderline-to-avoid** | 24% PUFA, highest oxalate (469 mg/100g), high phytate (1100-1500 mg/100g). Vitamin E and riboflavin obtainable from better sources. |
+| **5** | **Peanut** | **Avoid** | 32% PUFA, very high aflatoxin risk, PNA lectin (heat-stable), highest phytate. Compounds against mitochondrial function on multiple axes (Section 7.1). |
+| — | **Walnut, pecan, pistachio butter** | **Avoid as staple** | All >30% PUFA. Walnut at 72% PUFA is essentially seed oil. Use whole nuts sparingly for variety, not as butter. |
+| — | **Brazil nut** | **Discrete dose** | 1-2 whole nuts/day for selenium; not as butter. |
+
+#### 7.3.9 Mitigation Strategies If Consuming Sub-Optimal Nuts
+
+If almond butter or peanut butter is unavoidable for cost, social, or preference reasons:
+
+- **Pair with calcium** (cheese, yoghurt, milk, sardines) at the same meal — reduces oxalate absorption ~50-80%
+- **Pair with vitamin C** (citrus, berries) — improves non-heme iron absorption against tannin/phytate blockade
+- **Choose blanched** (skin removed) almond butter — reduces tannin and oxalate substantially
+- **For peanut: choose Valencia variety** (New Mexico-grown, arid climate, lower aflatoxin) and brands with published aflatoxin testing (Smucker's Natural, Once Again, ARTISANA)
+- **Refrigerate after opening** — slows further fungal growth and PUFA peroxidation
+- **Sprouted/activated nut butters** (soaked then dehydrated): reduce phytate by 30-50%; available as specialty product (Living Intentions, Better Than Roasted)
+- **Limit total daily intake** — even macadamia has caloric density implications; treat nut butter as a flavour and texture component rather than a primary fat source for the meal
+
+#### Framework Alignment Summary — Section 7.3
+
+The bioenergetic framework prioritises low-PUFA fats with stable saturated and monounsaturated profiles. Within nut butters specifically, only macadamia (and to a lesser extent hazelnut) meet the PUFA criterion without compromise. Cashew is acceptable in moderation. Almond, despite its cultural prominence as a "health food," combines significant PUFA load with the highest oxalate burden and substantial phytate, making it borderline-to-avoid in framework terms. Peanut fails on every axis (PUFA, aflatoxin, lectin, phytate) and is the clearest avoid in this category.
+
+The fundamental insight: nut butters are not interchangeable fat sources. The variation between macadamia and peanut is greater than the variation between butter and seed oil — the macadamia/peanut span covers ~2% to ~32% PUFA, while butter to seed oil covers ~3% to ~70%. Choice of nut butter has real metabolic consequences when consumed daily.
+
+#### Key References
+
+- Cao H et al. (2008) "Identification of a lipokine, a lipid hormone linking adipose tissue to systemic metabolism." *Cell* 134:933-944
+- Cosgrove JP et al. (1987) "The kinetics of the autoxidation of polyunsaturated fatty acids." *Lipids* 22:299-304
+- Holub BJ (2002) "Clinical nutrition: 4. Omega-3 fatty acids in cardiovascular care." *CMAJ* 166:608-615
+- Vucenik I, Shamsuddin AM (2006) "Protection against cancer by dietary IP6 and inositol." *Nutr Cancer* 55:109-125
+- Curhan GC et al. (2004) "Dietary calcium and the risk of incident kidney stones in younger women." *Arch Intern Med* 164:885-891
+- Holmes RP, Assimos DG (2004) "The impact of dietary oxalate on kidney stone formation." *Urol Res* 32:311-316
+- Wang Q et al. (1998) "Identification of intact peanut lectin in peripheral venous blood." *Lancet* 352:1831-1832
+- Kew MC (2003) "Synergistic interaction between aflatoxin B1 and hepatitis B virus in hepatocarcinogenesis." *Liver Int* 23:405-409
+- Alasalvar C et al. (2009) "Hazelnut (Corylus avellana L.) cultivars: a brief overview." *J Agric Food Chem* 57:10751-10765
+- Tey SL et al. (2013) "A randomized controlled study of the effect of almonds, hazelnuts and walnuts on lipid and lipoprotein profiles." *Eur J Clin Nutr* 67:553-558
+- Berryman CE et al. (2017) "Effects of daily almond consumption on cardiometabolic risk and abdominal adiposity in healthy adults with elevated LDL-cholesterol." *J Am Heart Assoc* 6:e005162
+- Lee Y et al. (2017) "Almond consumption and cardiovascular risk factors: an updated meta-analysis." *Adv Nutr* 8:e16
+- Senyilmaz-Tiebe D et al. (2018) "Dietary stearic acid regulates mitochondria in vivo in humans." *Nat Commun* 9:3129
+- USDA FoodData Central — entries for hazelnut (NDB 12120), cashew (NDB 12087), almond (NDB 12061), walnut (NDB 12155), pecan (NDB 12142), pistachio (NDB 12151), Brazil nut (NDB 12078)
+- Schlemmer U et al. (2009) "Phytate in foods and significance for humans: food sources, intake, processing, bioavailability, protective role and analysis." *Mol Nutr Food Res* 53:S330-S375
 
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