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Nutrition basics

What nutrition science actually agrees on, where the wellness industry oversells, and a sane default for adults who don't want to convert to a movement. This page is deliberately boring — most of what works in nutrition is.

Last updated 30 May 2026 Evidence-awareHow we label evidenceReport a correction

What science actually agrees on

Nutrition coverage online looks like a war zone because the loudest voices stake out extreme positions. The actual consensus across the major nutrition science bodies — the American Heart Association, NICE, the UK Eatwell Guide, the WHO, the Mediterranean Diet researchers — is remarkably stable. Versions of this list show up everywhere:

None of this is exciting, which is why entire businesses exist to convince you that the actual answer is far more complicated. It usually isn't.

Protein

The most reliably underdone macro for adults. The RDA (0.8 g/kg) keeps you alive; modern recommendations for adults over 30 trend higher — 1.2-1.6 g/kg for active adults, sometimes 1.6-2.2 g/kg for serious training. The protein-rich societies that age well do so partly because of this.

Distribute across the day; ~20-40 g protein per meal is more anabolic than the same total dumped in one meal. Sources can be animal, plant, or both — total intake matters more than animal-versus-plant for most people. The protein and strength baseline worksheet covers this.

Plants, in volume

The 30-plant-species-per-week heuristic from the gut microbiome literature isn't a magic number, but it's a usefully concrete target. Variety matters more than any single plant being optimal.

Fibre is the underrated win — most adults eat about half of the recommended 25-30 g per day. Whole grains, legumes, vegetables, fruit, and nuts collectively cover it. Fibre supplementation can be useful, but whole-food fibre is the easier story.

Ultra-processed foods

The NOVA framework distinguishes ultra-processed foods (industrially formulated, additive-laden, hyper-palatable) from minimally processed and processed foods. The case against ultra-processed isn't a single nutrient — it's the cumulative effect of energy density, low satiety, high palatability, and additive complexity.

Most observational evidence links higher ultra-processed intake to worse health outcomes. The intervention evidence is younger but consistent. The pragmatic move isn't purity; it's ‘most of what you eat comes from a kitchen, not a factory.’

What you drink

Liquid sugar is the worst offender in most adult diets — fruit juice and sweetened drinks bypass satiety and run blood sugar. Diet sodas are not equivalent — generally safer than sugary versions per regulators, but plain water is still the better default.

Alcohol is calorically dense, disrupts sleep, and adds load. Coffee is fine for most people with reasonable timing. Tea is fine. Most everything else is downstream of those.

What probably doesn't matter

High-noise areas the wellness industry sells hard but the science doesn't support strongly for healthy adults:

Common mistakes

  1. Believing the loudest online voices over the boring consensus bodies.
  2. Optimising supplements while the foundation (protein, plants, fibre, water) is still off.
  3. Treating one named diet as the answer rather than a starting point.
  4. Ignoring liquid sugar because it doesn't feel like sugar.
  5. Underestimating ultra-processed food intake because individual items don't feel that bad.
  6. Demanding perfection and giving up because perfection is unsustainable.
  7. Skipping clinician input when symptoms (energy, weight, blood markers) don't respond to basics.

Related

Sources

The references we lean on most heavily for this topic. We've tried to cite the strongest evidence on each claim rather than the most-cited summary. Reading the primary sources will always beat secondary write-ups — including ours.

FAQ

Carbs vs fat vs protein — which one matters most?
For most adults, protein adequacy is the most reliably underdone macro. Fat and carb ratios within reasonable bounds matter less than the overall food-quality story. The arguments online overstate effect sizes; the boring answer is ‘mostly real food, enough protein, mostly plants, not too much’ covers 90% of the value.
Are seed oils dangerous?
The strong claims circulating online aren't supported by the dietary research that actually exists. Saturated fat replaced with unsaturated fat improves most cardiovascular markers across the studies regulators rely on. There's reasonable debate about specific oils and high-temperature uses, but ‘seed oils cause everything’ isn't a defensible reading of the evidence.
Should I be intermittent fasting?
Fasting windows that some people sustain (12-16 hours) work fine for some and not for others. For most healthy adults, the meaningful drivers are still total food quality, protein adequacy, and energy balance — the timing matters less than marketing suggests. People with eating disorder history, pregnant or breastfeeding, or specific medical conditions should not try IF without clinical input.
Is sugar ‘toxic’?
Excess added sugar is genuinely harmful — particularly liquid sugar — and most adults eat more than they think. ‘Toxic’ in the literal sense is overreach. The pragmatic answer is to substantially reduce added and liquid sugars without obsessing about sugar in whole foods like fruit.
Do supplements help?
For most healthy adults with diverse diets, the evidence for routine supplementation is weaker than the marketing suggests. Specific exceptions: vitamin D where sun exposure is low, B12 for some vegetarians/vegans, omega-3 for some, iron for some pre-menopausal women. The right answer is bloodwork-informed, not influencer-informed.
What if I can't cook?
Then build a small repertoire of 5-10 reliable meals that hit the basics (protein, fibre, plant variety) without requiring chef skills. The bar isn't cooking-Instagram; it's ‘edible, repeatable, vaguely balanced.’ That's enough.