I agree that if you measure outcomes by life expectancy or activity level, being obese is objectively bad. But we give people agency to make their own decisions

I agree that if you measure outcomes by life expectancy or activity level, being obese is objectively bad. But we give people agency to make their own decisions, and obesity is a choice. It's both a personal choice, i.e. people choose their lifestyle and diet, and a societal choice, i.e. society chooses not to discourage unhealthy eating habits. Plenty of choices lead to objectively worse outcomes, but that doesn't mean those choices are unsustainable. It just means they're less than ideal.