However, it is within the grasp of everyone who wants to lose weight to do so.
No, it isn't.
I have two close friends who are overweight through no fault of their own, who cannot lose significant weight no matter what they do.
And they have been to doctors, dieticians, tried everything and anything short of surgery for more than ten years now and it is very much a genetic problem they cannot shake.
Well, I think one of the problems is that doctors are usually a bunch of morons when it comes to weight loss.
Really it's a matter of physics and biology.
The formula to lose weight is: Burn more calories than you eat per day.
It is almost impossible to not lose weight by following that. It's simple physics and biology (and math).
Are your friends men or women?
Actually this is a consistent problem, your average doctor isn't very good with obesity issues, specialists, nutritionists, trainers are often much more useful.
There's a reason there are a lot more obese people today than 10, 20, 30, 50 years ago, and its not becuase our genetics have suddenly gone haywire, its behavior, specifically usually behavior in an atmosphere of abundance.