Hale Handbook

Paleo Diet: Eating Like a Caveman, Examined

Meat, fish, vegetables, fruit and nuts, and no grains, beans or dairy. The food is often good, but the reasoning is shakier than it sounds.

2 min readUpdated November 2026Not reviewed by a doctor

The short version

  • Paleo removes grains, beans, dairy, added sugar and processed food.
  • It can lead to weight loss, largely because it cuts out most ultra-processed food.
  • Evidence is limited to small, short studies, and removing beans and whole grains isn't supported by science.
In a sentence
Meat, fish, vegetables, fruit and nuts. No grains, beans or dairy.
How restrictive
Counting needed?
No
Quality of evidence
Limited
Typical cost
Higher
Main drawback
Removes beans and whole grains for no good reason, and is low in calcium

See how this compares with every other diet →

The idea

The theory is that human bodies evolved for the foods of the Paleolithic era, so farming-era foods like grains and dairy are behind modern disease. It's an appealing story, but it doesn't hold up that well. Hunter-gatherer diets varied enormously by place, and humans have kept evolving since then, including the ability to digest milk in many populations.

What you eat

  • Eat: Meat, fish, eggs, vegetables, fruit, nuts, seeds, plant oils such as olive oil
  • Avoid: Grains, beans and lentils, dairy, refined sugar, processed food, and often white potatoes and salt

What the evidence says

Weight. Small, short trials suggest people lose weight on paleo over a period of months, and may see improved blood sugar and blood pressure. That's not surprising when a diet cuts out most sugary, ultra-processed food. Larger and longer trials are lacking, and dropout rates tend to be high.

The missing foods. Whole grains and beans are among the foods most consistently linked with better long-term health. Nothing in the research supports removing them for people who don't have an allergy or a condition like celiac disease.

What's good, and what to change

The good part is the emphasis on whole foods, vegetables and protein, and cutting out junk. You can keep all of that and still eat beans and oats.

If you're going to try it:

  • Don't let it become a meat-heavy diet. Keep vegetables as the largest part of your plate.
  • Prefer fish, poultry and eggs, and keep red and processed meat in check. Bacon is not a health food just because it's paleo.
  • Replace calcium with leafy greens, canned fish with bones and, if you need to, a fortified alternative.
  • Watch your fiber, since you've removed beans and grains.

Pros and cons

Good: No counting, clear rules, and it cuts down on ultra-processed food and added sugar.

Harder: Expensive, hard to eat out on, and needlessly restrictive. Low in calcium and potentially vitamin D, and often high in saturated fat if it's done carelessly.

Sources

  1. Harvard T.H. Chan School of Public Health: Diet Review: Paleo
  2. American Heart Association: 2021 Dietary Guidance to Improve Cardiovascular Health

This guide is general information, not medical advice. Please check with a clinician before making big changes, especially if you have a health condition, take medication, or are pregnant. Read the full disclaimer.

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