Nutrition and brain health

What we eat reaches the brain. A growing body of evidence links certain dietary patterns to sharper cognition and slower decline.

The brain is only about 2% of body weight but consumes roughly a fifth of our energy, and it is built and maintained from the raw materials we eat. It should be no surprise that diet and cognition are connected.

The strongest signal: dietary patterns

The clearest evidence points not to single nutrients but to whole patterns of eating. Higher adherence to the Mediterranean diet is linked with better memory and processing speed, and with long-term protection against cognitive decline, including a reduced risk of Alzheimer's and dementia.¹

Omega-3s and the neuron

Among individual components, omega-3 fatty acids, especially DHA, stand out. They help maintain the integrity of neuronal membranes, modulate inflammation, and support synaptic plasticity, and higher intake of DHA-rich fish is associated with a reduced onset of dementia.²

The brain is built from what we eat, and, it seems, defended by it too.

Whole foods over pills

An important nuance: the benefits track most reliably with whole-food dietary patterns rather than with isolated supplements, which have shown inconsistent effects.³ It is the overall pattern, more than any single capsule, that appears to matter.

Why it matters

None of this makes diet a cure. But it does place everyday nutrition among the modifiable factors that shape how the brain ages, a quietly powerful lever, available across a whole lifetime.