I got fat because I, with no assistance from anyone or any outside forces, shoved way too much food in my mouth, and often 'carb' foods like chips, french fries, ice cream and beer.

You can not get fat unless you consume more calories than your body needs, over an extended period.

It is not a disease (just as I think that calling drug addiction a 'disease' is wrong...personal opinion). It is self-inflicted, although that is obviously a gross oversimplification of why folks become overweight/ obese.

( I am extremely cynical of the push to classify everything a disease, because it is usually pushed by folks who will benefit from that classification (and I am not talking about those folks suffering from a given condition))