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Originally posted January 2018 / Updated February 2023
The paleo diet, also called the Paleolithic, caveman, or hunter-gatherer diet, is based on what proponents claim were the foods available to prehistoric humans in the Old Stone Age or Paleolithic Era (roughly 2.5 million years ago to 10,000 B.C.).
There is a lot of debate about the human diet during this period, as people struggled to find food at this time. And modern versions of almost every food dramatically differ from what it was during the Stone Age.
Even common foods have changed dramatically over time through the cultivation of hybrids and selective breeding. And there has also been the development of many ultra-processed foods in the last 100 years.
The foundation of the paleo diet is an emphasis on lean proteins such as lean cuts of red meat, poultry, pork, wild fish, and shellfish. These foods should provide about half the daily calories. The diet also emphasizes eggs, organ meats, moderate amounts of fruit and non-starchy vegetables, and healthy fats from seeds, nuts, olive oil, and avocados.
Foods to avoid are all dairy products, grains and products made with grain, beans, legumes, vegetable oils, high-omega-6 fatty acids such as corn, soy, safflower, sunflower oil, and iodized salts.
Natural sweeteners such as maple syrup and honey are permitted, while other sweeteners are prohibited.
Clinical research on the paleo diet has focused on promoting weight loss, improving blood sugar control, and lowering cholesterol levels.
Because the diet is low in carbohydrates, it is similar to the ketogenic or keto diet. Learn more about the keto diet here. As such, initial weight loss can be significant due to water weight loss. People typically lose 4–6% of their total body weight within a 10-to-12-week period.
There are only a few long-term studies on the paleo diet. One reason may be that it is very challenging to follow long-term because it is so restrictive. The paleo diet can create some nutritional deficiencies; mainly, it is a low-calcium diet.
References:
Wg Dr. Michael Murray, N.D. 
