I follow Layne Norton on youtube, and he has a lot of great videos where he talks about how sugar(nor fat, insulin) are the real issue at hand. He does a great job of reading, and synthesizing lots of research into recommendations. Both for himself as a competition bodybuilder and power lifter, but also as a PhD. Ok, appeal to expertise aside. And yes, many will find him obnoxious in his demeanor, but that's not a rebuttal of his point.

His point basically is that Sugar is not in any way except for how it contributes to excess caloric intake. The key here is that sugar contains calories and can attribute to hyper-caloric state. But you can also eat lots of sugar and be in a hypo-caloric state. Therefore sugar has nothing to do with it. Total consumption is everything here (and body fat percent).

Have a watch of these videos:

https://www.youtube.com/watch?v=9JrT84PeTgw

https://www.youtube.com/watch?v=-eq8VObUFsk

https://www.youtube.com/watch?v=G3WN4zrEENY