When can you introduce sugar and chocolate to your kids diet?

My wife and I have already planned not give our baby any sweet foods. We're just few more weeks away from feeding our baby with solid food. And we will never ever add any sugar to her mashed fruits or veggies. From what I've read, babies who have eaten too much sugar caused them to be more hyper or proactive and they become picky eater in the long run. So, like what other parents will advise you, as much as possible, don't feed your baby / kid with sweets.