The thing about obesity is that it’s not just a black and white issue, there are a million shades of gray which complicate things and make it harder for us to understand it! Obesity can happen as a result of a number of reasons which is why there are a number of ways in which you can treat it and resolve the problem. That’s why some methods work for some while not for others, that’s why your friend was able to shed that extra weight with that diet but you couldn’t drop a pound doing the same things.
This was even backed by science, confirmed by a recent Yorkshire Health Study. They examined a group of 4,000 obese adults and managed to divide them into six distinct groups.