This is true but it is also because they are stupid, lazy and easily scammed. They go for the "miracle cure" that never works. They don't want to put in the work. They want to buy some shitty program that doesn't work. And as soon as their "miracle diet" is over, they go right back to eating the way they were. It is really unfathomable, how they don't see that eating like they were before it just going to bring the weight back.