Ray Peat on Vegetables

By OxidativeState · Oct 8, 2026 · 43 articles · 10 studies

Short answer: Ray Peat did not treat vegetables as automatically healthy. He wrote that plants defend themselves with chemicals aimed at the animals that eat them, that leaves carry more of these than roots and fruits, and that the question of what counts as food deserves more thought.

What Ray Peat wrote about vegetables

He granted that leaves contain essential nutrients. Cows, sheep, goats and deer thrive on them. Source: Vegetables, etc. — Who Defines Food?

But many leaves contain substances that block the use of those nutrients, and only specially adapted digestive systems, or technologies such as cooking, get past them. Source: Vegetables, etc. — Who Defines Food?

Plant toxins are aimed at animals. A toxin will block an animal enzyme and leave the plant's own version of that enzyme untouched. Source: Vegetables, etc. — Who Defines Food?

Roots contain chemicals that hold back microorganisms, but because grazing animals and insects cannot easily reach them, they have fewer of the digestive inhibitors found in the above-ground parts. Source: Vegetables, etc. — Who Defines Food?

Seeds are the most defended part. He described seed oils as part of the plant's own pesticide system. Source: Unsaturated Vegetable Oils: Toxic

Poor people have sometimes lived on greens such as collards, and made them edible by cooking them with fat and plenty of salt. Source: Vegetables, etc. — Who Defines Food?

He did rate some leaves for minerals: kale, turnip greens and beet greens have a good calcium to phosphate ratio, and leaves are rich in magnesium. Source: Phosphate, activation, and aging, Bone Density: First Do No Harm

Broccoli, or liver, eaten occasionally supplies the vitamin K that a daily raw carrot can reduce. Source: Rosacea, inflammation, and aging: The inefficiency of stress

What he suggested in practice

Cook leaves well.
Prefer roots and fruits to leaves and seeds.
A daily raw carrot is the exception he made for raw vegetables.

Where he wrote about it

This topic comes up in 43 of the articles on his site. These are the most relevant ones:

My take

A salad full of soluble fiber might be one of the worst things to eat if you suspect bacterial overgrowth. My vegetables are carrots, mushrooms, well-cooked leafy greens and potatoes.

Quick answers

Did Ray Peat say to avoid vegetables?

Not entirely. He warned that leaves and seeds contain defensive chemicals, preferred roots and fruits, and valued well-cooked greens such as kale for their minerals.

What vegetables did Ray Peat consider good?

Raw carrot for the bowel, and leaves such as kale, turnip greens and beet greens for their calcium to phosphate ratio, plus occasional broccoli for vitamin K.

10 studies Ray Peat cited on vegetables

Nutritional associations with bone loss during the menopausal transition: evidence of a beneficial effect of calcium, alcohol, and fruit and vegetable nutrients and of a detrimental effect of fatty acidsAm J Clin Nutr · 2004 · PMID 14684412 · cited in Osteoporosis, aging, tissue renewal, and product science
Hypotonicity induces L-selectin shedding in human neutrophilsAm J Physiol Cell Physiol · 2001 · PMID 11546679 · cited in Water: swelling, tension, pain, fatigue, aging
Suppression of inducible cyclooxygenase and inducible nitric oxide synthase by apigenin and related flavonoids in mouse macrophagesCarcinogenesis · 1999 · PMID 10506109 · cited in The Cancer Matrix
Piceatannol, a stilbene phytochemical, inhibits mitochondrial F0F1-ATPase activity by targeting the F1 complexBiochem Biophys Res Commun · 1999 · PMID 10425214 · cited in Tissue-bound estrogen in aging
Occurrence of emodin, chrysophanol and physcion in vegetables, herbs and liquors. Genotoxicity and anti-genotoxicity of the anthraquinones and of the whole plantsFood Chem Toxicol · 1999 · PMID 10456676 · cited in Vegetables, etc. — Who Defines Food?
Effects of tea polyphenols and flavonoids on liver microsomal glucuronidation of estradiol and estroneJ Steroid Biochem Mol Biol · 1998 · PMID 9605416 · cited in Natural Estrogens
[Estrogens of vegetable origin]Ginecol Obstet Mex · 1998 · PMID 9608188 · cited in Natural Estrogens
Free fatty acid fractions from some vegetable oils exhibit reduced survival time-shortening activity in stroke-prone spontaneously hypertensive ratsLipids · 1998 · PMID 9688167 · cited in The Great Fish Oil Experiment
Effects of co-administration of butylated hydroxytoluene, butylated hydroxyanisole and flavonoids on the activation of mutagens and drug-metabolizing enzymes in miceToxicology · 1997 · PMID 9274802 · cited in Natural Estrogens
Unusual effects of some vegetable oils on the survival time of stroke-prone spontaneously hypertensive ratsLipids · 1997 · PMID 9252963 · cited in The Great Fish Oil Experiment

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Not affiliated with raypeat.com. This page describes Ray Peat's published articles in our own words and links to the originals. Educational content, not medical advice.