Robert H. Lustig, professor of clinical pediatrics and director of the Weight Assessment for Teen and Child Health (WATCH) answers questions on why sucrose is so dangerous, and here’s a short Q&A with a lot of answers about it. I did a quick Google Translate for Norwegians, it’s pretty decent, you won’t misunderstand anything as far as I could tell. Original link inside it.
If you want a longer session where he goes further in depth on the topic, I recommend checking out this video where he’s giving a presentation on their findings.
Sugar: The Bitter Truth m/Robert H. Lustig
Basically, in summary, by cutting sugar completely, except the sugar you get through eating fruit, can make you lose weight, or stop going up in weight.