NOW HEAR THIS!! People are DIFFERENT. People have different body types, hormone levels, stress levels, activity levels. Some people have insulin problems, some people have digestive problems and some people have heart problems.
Isn't it possible that people, as different as they are, may not require the same diet to be healthy?
So, if low fat works for you, great! If low carb works for you, outstanding! Maybe you can eat anything you want as long as you exercise 30 minutes per day, wonderful!
Geez people, someone might think y'all are angling for a Nobel prize in being "more right" than anyone else.
Bingo!
I follow "The Zone" as a quantitative measure of how much to eat. There is also a qualitative side to the equation. Peter D'Adamo wrote an interesting book titled, "Eat Right 4 Your Type". His work is premised on ABO blood types. There are certain foods that are good/neutral/harmful for a given blood type. The blood type is indicative of the antigenic type of all the body's cells.
I spent years going to ear/nose/throat doctors trying to deal with a persistent sinus problem. After reading through D'Adamo's book, it appeared that the causitive agent was a wheat allergy. Bingo! No more post nasal drip. No more aches and pains in the joints. Today, I sometimes "slip" and consume food with wheat. All the symptoms return and remain for 2 to 3 days until the wheat has cleared.