Sugar and Fat, URL to .pdf Technical Paper and Super-short Summary

http://www.molmetab.com/article/S2212-8778(17)30239-9/pdf

In short, it says that high sugar, high fat diets are terrible, but high fat alone doesn't do the same kind of damage.

"A high-carbohydrate, high-fat diet, but not low-carbohydrat, high-fat diet, induces obesity and increases the hypothalamic inflammatory response." -- from the paper

This is terrific scientific support for the low-carb diets such as the Atkins Diet. YMMV