Avro, I will "slink away" from nothing.
Michelle Obama's main objective is to regulate food. Physical excercise appears to be an afterthought in the article I quoted, sandwiched between two food-related items.
Besides, my point was that a person who is grossly obese herself (just look at her from neck or at least from waist down) should be careful yakking about obesity.
I would think that learning what 'obese' means might be a useful thing for you to do.