Food first, supplements second, with one micronutrient caveat
September 27, 2026 · 19 min read
Attia and Mosconi stress that supplements cannot make up for poor diet, sleep and exercise, while Rhonda Patrick argues that common deficiencies in magnesium, vitamin D and omega-3s are worth correcting directly. Together they suggest a sensible order: fix foundations, then fill documented gaps.
The rules, numbers and steps worth keeping in front of you.
- Attia: exercise, sleep, nutrition and emotional health set the heading; supplements are a detail.
- Attia on NAD supplements for lifespan: the answer appears to be no.
- Attia's bar: human outcome data and clinical, not just statistical, significance.
- Huberman: supplements are insurance, not a necessity.
- Mosconi: supplements help if you are deficient but don't replace food; antioxidants work better from food.
- Hyman: food is 80% of the longevity game; advanced tools are the add-ons.
- Patrick's three common gaps: vitamin D, magnesium and marine omega-3s.
- Patrick: about 70% of Americans are low in vitamin D; her target is 40 to 60 ng/mL.
- Vitamin D rule of thumb: about 1,000 IU raises blood levels by about 5 ng/mL.
- Magnesium: leafy greens first, then a modest 130 to 135 mg supplement.
- Omega-3s: about two grams a day moved people from roughly 4% to 8% on the index.
- Plant omega-3s convert poorly; vegans can use microalgae oil.
- Test before and after supplementing; check fish oil quality and refrigerate it.
- Avoid megadoses, such as B6; check with a doctor if pregnant, ill or on medication.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.