No.
I won't tell that to people on certain medications or who have thyroid problems........because that's not who I'm talking to, and you know it.
SOME people have medical problems that make them gain weight.
MOST fat people are fat from eating too much and exercising too little.
You have no idea why MOST fat people are fat unless you know them personally. There are millions of people who are on antidepressants too that make them gain weight. Unless you are their medical doctor you know nothing about them.