I think it's just the pendulum swinging back the other way after it swung this way during the 19th to 20th centuries. Being fat was considered appealing in ye

I think it's just the pendulum swinging back the other way after it swung this way during the 19th to 20th centuries. Being fat was considered appealing in ye olde times, because it indicated to your peers that you had more access to food. Being lean became popular (again) in more recent times, especially with advances in entertainment like cinema and fashion magazines. Now that entertainment is lambasted for seeding unrealistic (and in some cases even harmful) expectations, so too has popularity for leanness waned. The pendulum will swing back again, of course. Before being fat became appealing, the ancient Greeks and Romans certainly preferred lean figures, judging by all their marble statues and other cultural artifacts.