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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
Mind or Body?
You ask whether problems such as obesity are a physical or a mental problem and the answer is that this is clearly a physical problem and there is no mental illness element present here at all.
Obesity is a widespread and growing problem in the US and, in the vast majority of cases, it is a lifestyle problem caused by poor dietary choices and a lack of exercise. In part therefore we need to educate people starting at an early age and, as a society, we need to move away from a 'convenience' culture. Making life easy is all well and good but a return to good old fashioned cooking and pushing the lawn mower around the yard would do more than anything else to solve the problem.