>The problem is that systematic problems requiring systematic solution doesn't provide a framework for individual behavior in the meantime.

To twist your analogy around, it's more like having a doctor say "you probably got cancer because you lived next to a coal plant." Incredibly important information to have societally, should absolutely be considered and maybe even an have impact on policy. However, that does nothing for the patient today.

Example: the body-positivity/fat-acceptance movement, which is often hostile to the concept of "unhealthy body weight" and "losing weight".