Hey, I'm a vegan. I don't eat animal products and also have an associated philosophy against using animals as a commodity.  
Is a vegan diet more healthy than a diet that consists of animal byproducts?
Sometimes... It depends how careful the person is balancing their diet. A well planned vegan diet reduces the risk of some chronic diseases, like heart disease. 
Really!  I did not know that!  Isn't it expensive to eat a vegan diet?
Veganism
Veganism is the practice of abstaining from the use of animal products, particularly in diet, and an associated philosophy that rejects the commodity status of animals. A follower of the diet or the philosophy is known as a vegan. Distinctions may be made between several categories of veganism. "Dietary vegans" (also known as strict vegetarians) refrain from consuming animal products, not only meat but also eggs, dairy products and other animal-derived substances. The term "ethical vegan" is often applied to those who
vegetarian diet that includes eggs and dairy.
- Vegan diet: In addition to the abstentions of a vegetarian diet, vegans do not use any product produced by animals, such as eggs, dairy products, or honey. The vegan philosophy and lifestyle is broader than just the diet and also includes abstaining from using any products tested on animals and often campaigning for animal rights.
Vegetarian diets Semi-vegetarian diets.
- Semi-vegetarianism: A predominantly vegetarian diet, in which meat is occasionally consumed.
- Kangatarian