Do you know the health benefits of friends? Having a lot of friends can boost how long you live as much as 20 percent! A large friend list may add years to your life. One study found people with a lot of companions lived 22% longer than those with only a few. Good friends often encourage you to make healthy choices, like staying active. They can squash stress, too. Loneliness is actually harmful to your health. Loneliness doesn't just feel bad, it's actually bad for you. Rese