Vegetarianism: This is a diet with no flesh foods. It consists of vegetables, fruits, nuts, seeds, and dairy products. Some people decide that the only type of meat they will eat is fish, and they might still consider themselves vegetarians, even though they technically are not. Fish flesh contains high amounts of omega-3 fatty acids, but people who do not eat meat can receive omega-3 fatty acids from flax seeds. For those who choose to become vegetarians for ethical and philosophical reasons, many feel that eating fish is still causing suffering to the fish and overly fishing the oceans is destructive to the eco-system as well. For health reasons, fish is sometimes avoided. Fish and other seafood often contain high amounts of mercury and other toxins that are unhealthy to the body, for the ocean has become a dumping ground for illegal, toxic, industrial waste.

Fruitarianism: This is a diet that consists of the fruit of plants. This includes fruits such as oranges, apples and also seeds, nuts, squash, peas, and other such foods that contain the reproductive part of plants. Fruitarians often believe that this type of diet is the original diet of humans and thus the most natural one. There is a question, however, of whether fruitarians receive enough B12 in this type of diet.

Standard American Diet (S.A.D.): This often includes processed foods, fast foods, meat, dairy, and small amounts of vegetables and fruit.

Veganism: A diet without any animal products or meat. A vegan diet is 100% plant based, not even dairy is consumed.

Raw Foodism: The practice of eating only uncooked foods.

Breatharianism: Receiving nourishment directly from the energy of the earth, air, sun, and spirit.