not so. I have always been big, but rarely fat...but a pituitary tumor has caused my body to stop producing hormones so I have no metabolism...I am running 365 these days, nutritional plans and exercise has little effect... the only options the medical community can come up with is surgery...which is basically self imposed starvation...and that comes with its own host of health issues. people are not always fat because they are lazy or cannot push away from a bag of cheetohs.
curiously, a fairly high percent of the population are born with these pituitary tumors... in some people they grow later in life while in others they do not... but I hear they cause health issues for about 20% of the population