Unless there is an underlying medical problem, like a thyroid condition, it works for everybody. Avoid a lot of carbs, myself. I went from 215 lbs at one point several years ago to a steady 180 now. Some carbs are okay, just don't overindulge. Sugar is not as bad as they used to say when we were kids in the 60's. The real PROBLEM IS HIGH FRUCTOSE CORN SYRUP and its derivatives, like CORN SYRUP SOLIDS:
A sweet problem: Princeton researchers find that high-fructose corn syrup prompts considerably more weight gain
http://www.princeton.edu/main/news/archive/S26/91/22K07/
I agree. I find a few cups of coffee a day with a bit of sugar in them doesn't mess me up.