The Bill Clinton wrote a series on how to increase your longevity. The number one way was to be like a vegetarian. This means:

a) Fewer bad fats
b) More antioxidants
c) Lower weight

All of these are typical of vegetarians that are not junk food vegetarians. You must cut back or eliminate all animal products, you must actually eat your vegetables and you must not eat just vegetarian junk food. You can eat French fries, potato chips and certain cookies and be vegetarian but you will gain weight, get none of the benefits of plant based foods like antioxidants and fiber.