Harvard Health Content API

One of the least restrictive diets, it starts with fruits, vegetables, and whole grains, then permits lean meat, poultry, or fish in moderate portion sizes.

It emphasizes fruits, vegetables, and whole grains, with beans and legumes providing the protein. Variations include an allowance for diary or eggs.

These dietary plans aren’t necessarily vegan. They put plants first, but allow for proteins from fish or animal sources.

It’s based on giving up certain foods for a month to eliminate cravings and reset hormones.

The Mediterranean variant of the paleo diet swaps wild-caught seafood for lean meat.

Mimicking the diet of our caveman ancestors, the paleo diet emphasizes a balance of 30% fat, 35% vegetables (no grains) and 35% protein. It restricts any kind of processed food.

A meal-replacement program that emphasizes reduced calories and six small meals a day.

Highly restrictive, the Dukan diet declares war on both carbs and fats.

Relying on very little evidence, the carnivore diet relies on ultra-high protein sources and nearly zero carbs.

A low-carb diet that’s very high in fat, the “keto” diet is also known for lowering blood sugar.