The worst effects of excessive Insulin, non alcoholic fatty liver and insulin resistance (which becomes type 2 diabetes after some time) can be reversed pretty easily by cutting sugar, fasting or a diet with extremely low levels of carbohydrates (Ketogenic Diet). Check Dr. Jason Fung and Robert Lustig on youtube. They both have done a great deal of research about the topic and have published very interesting material. I have adopted a very high fat, low carb diet (LCHF) and avoid all sugar for a couple months now and it is absolutely incredible how it changes your body, makes you loose fat and increases overall energy. Gone are these cycles of high and crashing after meals etc. I am absolutely convinced, that we will have a wake up to the toxicity of sugar very similar to that of cigarettes. Especially cancer and sugar seem to have a very strong and under researched relationship.