Over at Dhamma Wheel (Theravada) we are surveying and discussing this, so thought it might be interesting to see how the percentages differ, if at all between Theravada and Mahayana practitioners.
1. Carnivore - meat only, no other food, no fruit, veggies, grains, or bread, etc.
2. Omnivore - (almost) anything goes, red meat, poultry, fish, veggies, etc.
3. Flexitarianism - A diet that consists primarily of vegetarian food, but includes occasional exceptions for some kinds of meat.
4. Pescetarianism - A diet that is mainly vegetarian but also includes fish and sometimes other seafood.
5. Pollotarianism - A diet that is mainly vegetarian but also includes poultry.
6. Lacto-ovo vegetarianism is a vegetarian diet that permits consumption of animal products such eggs, milk, and honey.
7. Veganism abstains from all animal flesh and animal products, including milk, honey, and eggs.
8. Organic veganism - only organic vegan foods.
9. Raw veganism is a diet of fresh and uncooked fruit, nuts, seeds, and vegetables.
10. Fruitarianism is a diet of only fruit, nuts, seeds, and other plant matter that can be gathered without harming the plant (many Jains follow this diet).