I have just moved to San Francisco from Paris and I have got to say that the large proportion of severely obese people is a little more than weird to me.
In case it is relevant I am 1.90m/6.2ft and weigh 72kgs/160 lb. I slowly gained weight until hitting 84 kgs/185 lb) and decided to lose it all. It took roughly one year (without any real effort other than reducing my rations and avoid junk food) but at my thinnest I was at 69kgs (152 lb). If anything, I should build some more mass.
It is very anecdotical, I am only mentioning this because it obviously colors my vision of weight.