Do people with braces actually make serious alterations to their diets?

I didn't change my diet much at all apart from maybe for the week after they were tightened because of pain. I didn't chew gum to start with but then realized that it actually took the pain away. Orthodontists just say that as their spirl, though do be careful with toffee lollies as a friend managed to pull her entire braces off eating these though I never had a problem.