You must mean "stop having anything with added sugar" because humans need sugars to survive, nearly all food has natural sugars in it, and if you ate 0 grams of sugar for more than a couple of weeks you would die.
I'm being a bit pedantic because it's important to understand that moderation is the key, not trying to completely eliminate one family of molecules from your diet.
I'm being a bit pedantic because it's important to understand that moderation is the key, not trying to completely eliminate one family of molecules from your diet.