Here is some great work from Dr. Zoë Harcombe. The dietary (low-)fat guidelines had no evidence base when they were introduced 40 years ago - and they still don't. There's really no good scientific reason to fear natural fats.
It's about time we question everything we thought we knew about fat in general, and saturated fat in particular:
The British Journal of Sports Medicine: Dietary Fat Guidelines Have No Evidence Base: Where Next for Public Health Nutritional Advice?