Again, you're focusing too much on weight. "Healthy" does not mean "not overweight." There are tons of people, including young people, who can't do 5 minutes o

Again, you're focusing too much on weight. "Healthy" does not mean "not overweight." There are tons of people, including young people, who can't do 5 minutes of moderately intense walking without becoming excessively winded. There are lots of people who can't do more than a pushup or two, and many can't even do a single pushup. And so on and so forth. A good percentage of these people are not overweight. Many of the problems that become particularly troublesome as people age are related more to cardiovascular health and functional strength than they are to weight alone. If we create a magic pill that prevents or delays the onset of excessive weight gain from poor diet and lack of exercise, it's not going to produce "healthy" people and it won't address many of the quality of life issues that arise from unhealthy lifestyles. In some ways, weight gain is a good thing. For young people who otherwise feel okay, it is sometimes the only visible symptom of a destructive lifestyle. And I say that as someone who lost nearly a third of my body weight by radically changing my lifestyle in my 20s.