After all, our ancestors were healthier than we are, right? Enter the carnivore diet meal plan — which is pretty much what its name implies, lots of meat products and no carbohydrates.

Diets with over 35% of total calories from protein have been linked to drops in both resting and post-exercise testosterone. The "dirty" carnivore diet is closer to keto than the strict carnivore ...

There is no long-term research, only anecdotes about the purported benefits of the carnivore diet. Meat is a good source of protein, vitamins, and minerals, but it lacks fiber and vitamin C.