There's nothing deadly about white sugar. It's just empty calories. There isn't anything inherently toxic about it, unlike, say...wheat, corn, soy or canola oil. White sugar is only a problem when it's consumed in a chronic caloric excess - but anything in excess is a problem.
Originally Posted by Paleobird
Displacing whole food calories for white sugar is a bad idea because you're not getting any nutrition along with it. That's why it's better to eat fruit than sucrose - you're getting tons of nutrients with it. But a little here and there isn't harmful for the overwhelming majority, and can even be medicinal for those with metabolic issues or athletes.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.