[Vegetarian diets; effect on health]

Vegetarian diets are those diets mainly based on the consumption of vegetable product, but that also permit consumption of eggs and milk. The American Dietetic Association made a declaration on these vegetarian diets in which they stated that . Some studies have shown beneficial results in obesity, cancer, Parkinson disease, hypertension, type 2 diabetes mellitus and urinary stones, compared with the omnivorous. The possible theoretical benefits in some diseases has been seen in the medical practice (diabetes mellitus, obesity, cardiovascular risk). However more studies are needed in the case of Parkinson's disease and rheumatoid arthritis.