I am a huge believer in low fat diets, even though I hate the name "low fat." The truth is that most natural whole foods - with a few exceptions such as cardiovascular-friendly tree nuts - are low in fat. The fact that "low fat" diets are not low fat has been shown time and again by the fact that the healthiest and longest lived peoples on the planet eat lower fat diets - definitely much less than the typical American. Furthermore, you really need good control of lipids (LDL-P and apoB) and inflammation (oxLDL and CRP) to keep plaque off of your arteries. A well done low fat diet can achieve both of these. Furthermore, a low fat diet can have a an excellent omega-3 to omega-6 fat ratio as well and will generally create excellent gut health. No other diet can do this so consistently as far as I know. Check out the links below and you'll see the research that backs up these bold statements.
LOW FAT DIETS:
FLEXITARIANISM (90+ PLANTS; LIMITED ANIMAL (<10% DAIRY< EGGS and MEAT):
I am a vegetarian and believe that vegetarianism and plant based / vegan diets will soon dominate for reasons I outline on this page: Why I Believe Plant Based Diets Will Win. Basically, they are as good or perhaps a little better on testosterone and, if done right, are going to be much better for blood flow, erections and cardiovascular health. However, I do have to admit that the healthiest and longest-lived cultures on the planet were actually flexitarians: they ate 85-95% plants and 5-15% animal foods. Knowing that not everyone can instantly give up all meat, a flexitarian diet is a solid option and several notable low fat cultures and leaders have eaten a little bit of lean meat, including Nathan Pritikin, Dr. K. Lance Gould, the Pritikin Institute and the Tarahumara.