That's actually not true GG...
Stop eating foods that are bad for you and SO MUCH of it, and get some daily exercise is the correct answer.
If you're not eating truckloads of shit every day, you will not be fat even without exercise.
Don't make the simple point any more complicated than it need be.
If you're depressed but don't eat truckloads of shit, you won't be fat.
If you love and crave food but don't eat truckloads of shit, you won't be fat.
Whatever other excuse is given, if you don't eat truckloads of shit, you won't be fat.
Fact is, fat people make a choice. They choose the taste of lots of unhealthy foods over social acceptance. That is their choice to make and they live with the consequences.