The carnivore diet is an eating plan that involves consuming only animal products and water, eliminating all plant-based foods. It's also known as the "zero carb" diet because it allows no carbohydrates. The diet's premise is that by cutting carbs, the body will burn fat for energy, leading to weight loss. The carnivore diet permits meat, poultry, eggs, seafood, fish, and dairy products like cheese, butter, and cream.

The ketogenic diet is a high-fat, low-carb dietary plan that forces the body to burn fat instead of carbohydrates. It typically involves limiting carbs to 20–50 grams per day, and replacing them with fats like nuts, eggs, fish, and meat. Ketogenic diets can vary, but often consist of 70–75% fat, 15–20% protein, and 5–10% carbs. People use keto to lose weight, but it can also help manage certain medical conditions like epilepsy.