Zelda64:
Is it possible to be fat and healthy. Is it possible to me medically obese, meaning being based off of the bmi system, and healthy.
The other responses are good.
BMI is simply a function based on weight vs. height. It says nothing about what the weight consists of.
Not saying you should slave away at the gym, but bodybuilders are often "overweight" or even "obese" based on weight.
Also, a lot of football players, volleyball players, softball players, etc. are heavy. In high school, I was often mesmerized by how thick the volleyball players were, although looking back many were a bit thinner than I would have really preferred.
I think the worse thing is if you aren't at least somewhat active. Not saying you should be able to run a marathon, but.. you should be able to drive a car for 10-12+ hours on one day, be able to walk across a supermarket or shopping mall, and be able to hang out at a park. A 5 block walk shouldn't scare you. I also expect you to be able to carry a 40 lb box up 3 flights of stairs.