It is really hard to stop eating sugar so drastically but it helped me a lot. After that eating even a small piece of chocolate was giving me a sugar high. High in the sense of you feel it in your whole buddy and get goosebumps. Nowadays I am more relaxed regarding sugar but I am nowhere close to "bad old times". I went from 2L-3L of high sugar soft drinks like Coke and high amounts of sweets every day to zero for a while and after that started slowly.