Harm of sugar. How harmful is the sweet?

Harm of sugar - does it really exist? What kinds of sugar are there? The harm of what type of sugar is considered to be the strongest, and what is "white death"? How is the harm of sugar manifested in relation to the cardiovascular system? How does sugar break blood circulation and lead to a heart attack or stroke? How does sugar lead to diabetes of the first and second type? What is lipogenesis? Why excessive consumption of sugar leads to obesity? Why dependence on sugar can contribute to the emergence of dependence on real drugs?