An important thing to know it is that "sugar" is the overall term for several different chemical substances; fructose, glucose and sucrose - all types of "sugar" - are absorbed by the body in the same way. Therefore fruit sugars, honey, agave and all the rest of the natural sweeteners that we are told are healthy alternatives to sugar are also technically “sugar”, your body does not distinguish. The key to eating those foods is the strength of sweetness and the quantity you use. Let me explain. A spoonful of honey has 22 calories compared to 16 in a spoonful of sugar. So why is honey considered a healthier alternative? Honey is much much sweeter and denser than sugar so you need a lot less of it to achieve the same effect, therefore having less of the fructose and glucose, which are the two sugars that predominantly make up honey. Honey is also rich on minerals and nutrients and has some antibiotic properties, processed sugar has none of that.
I hope that you find this helpful. Too many young people these days go through drastic measures to slim down because they either have no inspiration, or too little information, both things that are easily fixed.