There are several kinds of meat-free diets. The most common are: Lacto-ovo-vegetarian: this describes the majority of vegetarians. Meat, poultry and fish are excluded, but eggs and dairy products are still eaten. Lacto-vegetarian: Meat, poultry, fish and eggs are excluded; dairy products are still eaten. Vegan: All animal products are excluded, including meat, poultry, fish, eggs and dairy products. So what nutrients do animal products provide and what are alternative sources?