CNN reports that one third of the world’s population is overweight (BMI over 25; over 30 is obese) with the US leading the way.
13% of the world’s children are overweight.
It certainly appears that better educated people in the US have fewer weight problems., Young adult cis gay males are less likely to be overweight than usual (just notice Pride this past weekend).
People in native populations exposed to process foods are more likely to become overweight (and diabetes) than European or African peoples, because they evolved in a culture with less over-prepared food available. Just like wild animals (mammals) would become diabetic if fed human foods; they stay healthy on what they can catch or forage.
Yet, I’ve always seen the weigh-loss business as rather pimpy.