Which once again, the lady I am referring to is twice my age, NOT naturally thin, and she is thinner than me with proper diet and exercise. What I am saying is that genetics aren't everything. She's not the only person I know who has made a turn-around with genetics and body weight. I know plenty of people who have. It's what you eat, not how fast your natural metabolism is (though that does play a part in how you can eat).
As for physiological factors, I do understand them. Certain people are more prone to fat gain and have a harder time losing weight, but that does
not mean it is impossible or really difficult for them. Health and weight loss requires a commitment and a proper routine. There are people I have met who cannot lose weight--usually that's because of medication, not genetics. You have to work with your body to get it to a healthy weight. I am sorry, but nobody is "naturally" obese or "naturally" 30+lbs overweight.
Obese parents are more likely to have obese children. It could be related to what the parents feed their kids, rather than genetics.
http://www.weightwatchers.com/util/art/index_art.aspx?tabnum=1&art_id=20791&sc=801
"The bottom line is that biology is not destiny. While genes influence susceptibility to overweight and have an influence on weight-related behaviors, the genes cannot be expressed unless the environment supports them."
It is not generalizing when it's true. Some women in America are health conscious, but that does not change the fact that the vast majority are not or are misinformed and make the wrong decisions health-wise. In my particular region it is very common to see healthy, fit women in their 30s, 40s and 50s walking around. However where I grew up, it's less common. I have spent a long time looking at the eating and exercise habits of Americans.
Our exercise and healthy eating has not been increasing. Some years it'll go up a little, some it will go down. America has a huge weight problem that it needs to fix, and it really has let itself go. Part of it is people who are not properly informed about nutrition and parents that make bad choices for their kids, but a good chunk of it is people who just don't care. I've seen fit women shamed by women who did not stay in shape as they aged because the fit women were "vain and stupid and care too much about their appearance". While a niche health movement is slowly growing, it isn't enough to counter the obesity problem.