Diet gurus, books, videos, and Apps are all the rage and create billions $$$ in sales every year. However, most Biochemistry PhDs already know that most of what is sold to you is all..crap.
If you digest and adsorb more calories than you need…your body will turn it into fat and store it. You can eat fat free food but it does not matter because your biochemical pathways can convert between carbs, protein and fats; any one can be turned and diverted to the others.
If you wish to avoid age onset diabetes and other problems of metabolic syndrome then you need to decrease intake to achieve a healthy weight.
You can read more in my blog….The Science Rant
“Metabolic Syndrome & Diabetes: what you can do to avoid it? Start with Sugar.”