Why are more affluent people generally slimmer? I’ve always wondered that.
It’s complex, but reasons must include
Better diet, so nutrients trigger satiety.
Fresh veg is expensive, perishable and time consuming to prepare.
More food choice in Waitrose than in say a corner shop.
More childcare so more opportunity to exercise.
More access to exercise and leisure. Kit, classes etc.
Possibly more education around nutrition.
Less stress , so less comfort eating.
Role models of tackling problems in a systematic way, and that working out( complex, but if you have only seen your parents trapped in poverty, must give a feeling of helplessness, limited options.)
Wealth gives rise to feelings of possibilities and longer term control over life.
Poverty tends towards short term goals and short term gratification.
Probably lots more that others might want to add.