A number do gain back. Some of it is behavior.
I wonder whether there is re-infection in the homes with other obese people. Perhaps they need to have booster gut-inoculations of the “skinny” bacteria.
What a Market! if true.
A number do gain back. Some of it is behavior.
Most of it, I think, is bad advice.
There aren't many people, I think, who are significantly overweight who haven't tried, many times, to lose the weight. The problem is that nearly all the advice they've been getting is simply wrong.