The Brain-Nutrition Protocol
Fuel mood and focus with omega-3s, B vitamins, anthocyanins and vitamin D
- Difficulty
- Easy
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 85%
This protocol targets the four nutrients with the strongest evidence for brain structure and function. Omega-3 fats form roughly a quarter of the brain; a colleague likens skipping oily fish to swapping 25% of a house's bricks for polystyrene, structurally fine until stress hits. Two portions of oily fish a week (or algae oil for vegans) covers this and also feeds anti-inflammatory gut bacteria. B vitamins manufacture serotonin, melatonin, dopamine and GABA, and in controlled studies work like SSRIs for some people. Anthocyanins, the purple pigments in blueberries and red cabbage, improve blood flow to the brain; children given a blueberry smoothie before an exam outperform those who aren't. Vitamin D, now viewed as a hormone, supports brain and immune health and should be supplemented through winter. Food comes first; supplements fill gaps.
Origin
Shared by dietitian Sophie Medlin, referencing colleague Kimberly Wilson on omega-3 and brain structure. Extracted from Deep Dive with Ali Abdaal.
Core principles
- 01About a quarter of the brain's structure wants to be built from omega-3 fats
- 02B vitamins make serotonin, melatonin, dopamine and GABA
- 03Anthocyanins improve blood flow to the brain and short-term performance
- 04Vitamin D acts more like a hormone essential to brain and immune health
- 05Food-first, supplements only to fill genuine gaps
How to run it
- 1
Lock in omega-3
Eat at least two portions of oily fish a week; salmon is the most accessible, with mackerel and sardines also excellent. Vegans use an algae-oil supplement.
Pro tip Tinned sardines and mackerel are cheap, oily-fish sources.
Watch out Tuna is not an oily fish and doesn't count towards your two portions.
- 2
Cover B vitamins
Prioritise B-vitamin-rich foods for the neurotransmitters they build; consider a supplement if your diet is limited or you're deficient.
Pro tip B vitamins are especially important if you have ADHD or high cognitive demands.
- 3
Add anthocyanins
Include dark purple foods like blueberries and red cabbage for the pigments that boost blood flow to the brain.
Pro tip A blueberry smoothie before demanding mental work may give a short-term performance lift.
- 4
Supplement vitamin D in winter
Take vitamin D from October to April in the Northern Hemisphere; darker skin needs more sun to synthesise the same amount, so supplementation matters more.
Pro tip Many dietitians take it year-round given indoor lifestyles.
- 5
Keep food first
Use supplements only to top up genuine gaps, not to replace a balanced diet.
Pro tip Blend berries and greens with protein for a nutrient-dense brain smoothie.
Watch out Supplements can't rescue a poor diet, chronic stress or no exercise.
In the wild
In repeated tests, children given a blueberry smoothie before an exam outperformed peers who had no smoothie; when the groups were swapped, the smoothie group again did better. The likely mechanism is improved blood flow to the brain from anthocyanins, delivering a measurable short-term cognitive lift.
→ Consistently higher exam performance in the anthocyanin group.
Common mistakes
Counting tuna as oily fish
Tuna is not an oily fish, so relying on it leaves you short of the omega-3s the brain needs.
Popping pills over eating well
Supplements are the icing on the cake; without the foundational diet, exercise and stress management they do little.
Is it for you?
Best for
Anyone wanting to support mood, concentration and long-term brain health through diet.
Not ideal for
People needing acute mental-health treatment, which requires clinical care not just nutrition.
From the transcript
“Omega-3s are super super important for our brain structure ... either make sure you're having at least two portions of oily fish a week or…”
“if children are given a blueberry smoothie before an exam they perform better in that exam than the children who haven't”
From the episode
Heal Your Brain: How Your Gut Secretly Controls Your Brain Health - Dietitian Sophie Medlin
Dietitian Sophie Medlin