To each his own of course and if one gets good results then even more so. However I CANNOT condone non fat or reduced fat foods. FAT is not only essential but one of the BEST types of food to eat. Many vitamins and minerals REQUIRE fat to be properly absorbed AND utilized by the body. Also there are literally ESSENTIAL fatty acids the body NEEDS just like essential vitamins the body needs but does not make.
Also fat is not what makes someone FAT. I can eat whole sticks of butter and u know I'm not fat. Its actually about nutrition. Really I should write a whole article about this on Steemit, i already did for my book which I could just use here. But basically if you have proper nutrition ur not gonna get fat.
Also food alchemy is a big deal, meaning what foods you eat together sometimes has as much an affect on the "health" factor of food as the food it self.
Finally the type/quality of fat is a big deal. Meaning fat from an almond or goat milk yogurt for example would be a "healthy fat" (though with this u still have to factor in that health is "different for everyone" meaning what is healthy for one does not GUARINTEE it is healthy for another, this is why people who give health advise are often irresponsible in my mind.) so basically there are "healthy fats" and "unhealthy fats" and unhealthy fat is like hydrogenated oil, palm oil, soy oil, crisco, most oil in fried foods, etc etc. Fat from whole and fresh foods rather than processed foods are generally also "healthy fats" and processed foods are generally "unhealthy" fat. So there are a lot of factors not just in fats but in health in general. I am going to write you an even more in depth response on health as it is absolutely one of my specialties and I can tell it will actually be of benefit since u appear ready to be responsible. Its really quite easy when u figure it out.
Bless Brother~*~