Walnuts

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What are walnuts · the brain-shaped nut

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Most of the omega-3 in walnuts is the plant form, alpha-linolenic acid (), and the body can turn only a small share of it into the and found in fish. The chapter on why walnuts cannot replace fish oil shows which step of that conversion line is the bottleneck.

A halved walnut looks like a brain, so folk tradition has long said walnuts feed the brain. That is not a mechanism, and the reasons walnuts are worth eating have nothing to do with their shape: they are about 65% fat, most of it polyunsaturated, and a handful also brings protein, fiber, and polyphenols from the papery skin.

People with a tree-nut allergy should avoid walnuts completely. If, after eating them, the lips or throat feel tight or breathing becomes difficult, call emergency services immediately.

Educational content, not medical advice — consult a clinician.

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Walnuts

Read full story

Stop 1/5

What are walnuts · the brain-shaped nut

EVIDENCEGUIDE 1

READ THE ORIGINAL

Most of the omega-3 in walnuts is the plant form, alpha-linolenic acid (), and the body can turn only a small share of it into the and found in fish. The chapter on why walnuts cannot replace fish oil shows which step of that conversion line is the bottleneck.

A halved walnut looks like a brain, so folk tradition has long said walnuts feed the brain. That is not a mechanism, and the reasons walnuts are worth eating have nothing to do with their shape: they are about 65% fat, most of it polyunsaturated, and a handful also brings protein, fiber, and polyphenols from the papery skin.

People with a tree-nut allergy should avoid walnuts completely. If, after eating them, the lips or throat feel tight or breathing becomes difficult, call emergency services immediately.

Educational content, not medical advice — consult a clinician.