Veganism is a stricter form of vegetarianism; like vegetarians, vegans don’t eat any animals that have been killed and also avoid animal products altogether, so that means no eggs or dairy products and, usually, no honey either.
The ketogenic diet is a very low-carb, high-fat diet that shares many similarities with the Atkins and low-carb diets. It involves drastically reducing carbohydrate intake and replacing it with fat. This reduction in carbs puts your body into a metabolic state called ketosis.
The Atkins diet is a low-carb diet, usually recommended for weight loss. Proponents of this diet claim that you can lose weight while eating as much protein and fat as you want, as long as you avoid foods high in carbs.