Evidence-Informed Nutrition Support
Fatty Liver (MASLD / NAFLD)
Nutrition strategies associated with reduced hepatic fat and improved liver enzyme markers in human studies. MASLD is lifestyle-reversible in most cases before fibrosis develops.
Framing: MASLD affects ~25% of the global population. It is largely nutrition-driven and largely nutrition-reversible — but the window for maximum impact is before fibrosis sets in. This page does not replace hepatology evaluation.
1 — What the evidence supports
Strong — Multiple RCTs
- Caloric deficit 500–800 kcal/day reduces liver fat measurably
- Mediterranean diet superior to low-fat diet for liver fat (Esposito 2004)
- 5–10% body weight loss reduces liver fat 30–40% (consistent across cohorts)
- Fructose elimination dramatically reduces hepatic de novo lipogenesis
- Coffee 3+ cups/day associated with lower fibrosis risk (observational)
- Resistance training reduces liver fat independent of weight loss in RCTs
Moderate — Consistent signal
- Omega-3 fatty acids reduce liver fat in multiple small RCTs
- Vitamin E 800 IU/day reduced liver inflammation in PIVENS trial (non-diabetic NASH)
- Probiotic supplementation modestly reduces liver enzymes in small RCTs
2 — Weak or overhyped
- Liver "detox" supplements: milk thistle has very weak evidence; no supplement reverses fibrosis
- Fruit juice cleanses: concentrated fructose — directly worsens hepatic fat
- Vitamin D for NAFLD: deficiency is common but supplementation alone has not reversed NAFLD in RCTs
- High-protein shakes with added fructose: counterproductive — read labels
3 — Foods to emphasize
- Extra virgin olive oil
- Oily fish 2–3×/week
- All vegetables — especially cruciferous
- Coffee 3+ cups/day
- Walnuts
- Legumes
- Berries — low-fructose fruit
- Green tea (catechins)
4 — Foods to reduce
- All sugar-sweetened beverages (primary driver)
- Fruit juice (concentrated fructose)
- Added sugars and HFCS
- Alcohol — even moderate worsens MASLD
- Saturated fat from processed meat
- Ultra-processed foods
- Refined carbohydrates with high glycemic load
5 — Key labs to track
Primary
- ALT and AST (liver enzymes)
- GGT
- Fibroscan or MRI-PDFF (liver fat %)
- Fasting insulin / HOMA-IR
Secondary
- Triglycerides
- Fasting glucose / HbA1c
- Ferritin (elevated in NASH)
- Platelets (fibrosis proxy)
Tracking
- Weight trend — 5% loss matters
- Waist circumference
- CGM if prediabetes co-exists
- Sleep (apnea worsens MASLD)
6 — Supplement considerations
Evidence-graded. Click any to see the full EBL evidence card.
EPA/DHA Omega-3
Reduces liver fat in meta-analyses of small RCTs; heterogeneous evidence
Berberine
Reduces liver enzymes ALT/AST and liver fat in NASH RCTs
Magnesium Glycinate
Deficiency common in MASLD; supports insulin signaling
⚠ Medication & Nutrient Cautions
- Vitamin E 800 IU/day: PIVENS trial dose — do not exceed without monitoring; may increase hemorrhagic stroke risk
- Acetaminophen: hepatotoxic at >2g/day with liver disease; use cautiously even at OTC doses
- NSAIDs: avoid long-term use with liver disease
- Metformin: generally safe in MASLD; caution in advanced liver dysfunction (lactic acidosis risk)
- Statins in NAFLD: actually safe and potentially hepatoprotective — do not discontinue without guidance
Full contraindications tool → · Drug-nutrient depletion checker →
8 — When to consult your physician
- ALT >40 U/L on two occasions without clear cause
- AST:ALT ratio >2:1 (raises concern for alcohol-related disease)
- Any signs of cirrhosis: easy bruising, abdominal swelling, jaundice
- Before starting high-dose Vitamin E
- Consider GLP-1 agonist discussion if BMI >30 with MASLD — dramatic liver fat reduction shown
- Before taking any supplement marketed as "liver cleansing" — many are hepatotoxic
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