Many people say their health improved after switching to a vegan diet.
Alicia Silverstone took medicine for asthma before she became vegan.
Alicia Silverstone had allergy injections every month.
After becoming vegan, Alicia Silverstone says she felt worse.
Bill Clinton decided to go vegan after heart surgery.
Bill Clinton says he now has less energy.
The British Dietetic Association says well-planned vegan diets can be healthy for people of all ages.
Researchers at Oxford University say a vegan diet can help the environment.
Forests are sometimes destroyed to create land for raising animals.
Eating only plant-based food can reduce damage to the environment.
