Three primary dietary categories exist: vegan, vegetarian, and omnivorous. The vegetarian diet falls between the vegan and omnivorous diets. Individuals who adhere to a vegetarian diet abstain from consuming meat and fish. This type of diet presents a slightly more restricted alternative to the omnivorous diet but is less limiting than the vegan diet. The vegan diet is the most restrictive of the three, as it eliminates all animal-derived food products, including meat and fish.