Food Protocol — Diet

Abbreviation glossary

• IF — intermittent fasting = time-restricted feeding/eating window.
• CR — caloric restriction.
• CVD — cardiovascular disease.
• EVOO — extra-virgin olive oil.
• RCT — randomized controlled trial.

Intro — what we really know (and what we don’t)

Big picture. The strongest, most repeated signal: a Mediterranean-like pattern supports health and longevity — lots of vegetables & fruit, whole grains, legumes, nuts, fish, olive oil; little ultra-processed food and red/processed meat. In the large RCT PREDIMED, groups assigned to MedDiet had fewer major cardiovascular events than control. Network meta-analyses of diet programs (BMJ) also support survival/CVD benefits.

Key sources: PREDIMED re-analysis (NEJM 2018): NEJM; Diet programs — network meta-analysis: BMJ (2020).

Where evidence is strong. Whole grains, nuts, vegetables and fruit consistently associate with lower mortality and CVD in large observational syntheses. Simple rule: replace “white” refined foods with whole grains, add a handful of nuts and colorful produce — the long-term risk profile improves.

Where evidence is weaker. IF improves weight and some metabolic markers in RCTs, but there is no hard evidence that it extends human life. Autophagy is a real cellular process, but in humans we cannot simply say after how many fasting hours it meaningfully increases in each tissue. Likewise for “longevity supplements”: in healthy adults, large trials generally do not show fewer deaths or major cardiovascular events (exceptions are condition- or drug-specific).

1) Everyday eater — how to eat by life stage

20–40: build lifelong fundamentals

• Core: plate full of vegetables & fruit; whole grains instead of refined; nuts/seeds; legumes often; fish instead of red meat; EVOO as base fat.
• Rhythm: gentle IF (longer overnight break) can tidy up eating/glycemia — not a “longevity elixir”.
• Exception: planning pregnancy — folate 400–800 µg/d (supplement) reduces neural tube defect risk.

40–60: heart & metabolism

• As above, with more emphasis on swaps: white → whole-grain; snacks → nuts/legumes; red/processed meat → fish/plants. PREDIMED showed fewer CVD events.
• Protein: with typical activity, moderate, even intake is fine; prioritize overall dietary quality.

60+: muscle, strength, function

• Protein matters: geriatric groups (PROT-AGE/ESPEN) suggest ~1.0–1.2 g/kg/day + simple resistance training.
• Same plate composition; periodically check B12 and 25-OH-D (supplement only if deficient).

Everyday nudge: at each eating opportunity ask “what do I swap for something fuller, greener, less processed?” Over time, the sum matters.

2) What science says (studies & consensus)

Mediterranean pattern (MedDiet)

PREDIMED (RCT): fewer major CVD events in EVOO/nuts groups vs control; after re-randomization analysis, protection stands. Network reviews (BMJ) indicate MedDiet (and to varying degrees low-fat programs) reduce mortality and CVD.

Pillar foods

• Whole grains: chosen over refined → lower mortality/CVD risk.
• Nuts: more frequent intake → lower all-cause and CVD mortality.
• Vegetables & fruit: more and more diverse → lower long-term risk.

IF & CR

Animals: CR and forms of IF extend lifespan (gene/degree-dependent). Humans: IF improves weight and metabolic markers (RCT, umbrella review). In the 2-year CALERIE RCT, moderate CR improved many aging/risk biomarkers, but mortality data are absent (decades needed). Bottom line: IF/CR — metabolic tools, not a proven “long-life pill”.

Who should not start IF without individual advice: people who are pregnant or breastfeeding, underweight, have an eating disorder, are frail older adults, children, and people taking insulin or medicines that can cause low blood sugar. With chronic illness or during recovery, discuss fasting with a clinician or dietitian.

Key sources: IF umbrella review (metabolic outcomes): EClinicalMedicine / The Lancet (2024); CR — 2-year CALERIE RCT (healthy, non-obese): Ravussin 2015, Kraus 2019.

3) When to use supplements

Clear “yes” in defined situations

• Folate 400–800 µg/d when planning pregnancy — strong recommendations.
• Iodine in pregnancy/lactation if deficient risk (dose guided with clinician).

“Only if you’re deficient / have an indication”

• Vitamin D: in healthy adults large RCTs don’t show fewer major CVD/cancer events — correct deficiency.
• Omega-3 (EPA+DHA): in general population small/no effect on deaths/major CVD; exceptions are drugs (EPA) in high-risk patients.
• Vitamin B12: often needed in seniors, plant-based diets, malabsorption — then yes.

Key sources: Vitamin D — VITAL RCT: NEJM (2019); Omega-3 (EPA+DHA) — Cochrane review: Cochrane (2020).

Principle: supplements are corrective tools (pregnancy, deficiencies, specific diseases). Test first, then target.

4) Most “longevity-friendly” foods + protein (best sources)

Best-documented categories

• Whole grains (oats, rye, whole-wheat, brown rice, quinoa).
• Nuts & seeds (walnut, almond, pistachio, peanut, etc.).
• Vegetables & fruit — diverse colors = diverse protective compounds.
• Fish and EVOO — MedDiet pillars supported by RCTs.

Protein — how much & from what?

Amount: many adults do well around ~0.8–1.0 g/kg/day. Active people, those losing weight or rebuilding function may need more. For people aged 60+ and for prevention of muscle loss (sarcopenia), PROT-AGE/ESPEN commonly suggest ~1.0–1.2 g/kg/day, spread across meals and paired with resistance training.

Exception: with chronic kidney disease, severe liver disease or another special indication, protein intake should be set individually with a clinician or clinical dietitian.

Key sources: PROT-AGE recommendations: JAMDA (2013); ESPEN geriatric guideline: ESPEN (PDF).

Quality & sources:

• Fish (baked, boiled) — complete protein + favorable fats; a MedDiet pillar.
• Legumes (lentils, chickpeas, beans, tofu/tempeh) — protein + fiber + phytochemicals; linked with lower mortality/CVD.
• Fermented dairy (plain yogurt, kefir, skyr) — convenient protein; prefer low-sugar.
• Eggs — complete amino acids; eat sensibly, mind overall diet/lipids.
• Poultry (e.g., skinless chicken/turkey breast) — swap for red/processed meat.
• Nuts & seeds — protein + unsaturated fats; great swap for sweet/processed snacks.

Plants vs animal: no need to “combine” every amino in one meal — variety across the day/week counts. In practice, plants (legumes + grains) + fish/fermented dairy cover bases well.

Why these? Based on RCT PREDIMED, network diet reviews (BMJ), PROT-AGE/ESPEN positions for seniors, and reviews on fish/fermented dairy/legumes vs CVD and mortality.

Practical summary + sample combos

Eat most often

• Vegetables & fruit (multi-color, fresh/frozen) — plate core.
• Whole grains instead of “white” products.
• Nuts/seeds & legumes — metabolism & heart.
• Fish + EVOO — pillars backed by RCTs.

How to combine

• Whole-grain bowl: quinoa + roasted veg (broccoli/pepper/zucchini) + chickpeas + EVOO-lemon dressing.
• “Colors + nut” salad: leafy greens + apple/pear + walnut + olive oil.
• Swap at dinner: baked fish instead of red meat + buckwheat/groats + slaw (mixed colors).

IF: useful for convenience & glycemia, not a guaranteed longevity tool. CR: promising biomarkers in humans, no hard survival data (e.g., CALERIE). Priority: nutrient density + muscle strength.

Three simple versions by age