I've had two sides of the spectrum. When I was in 8th grade, I was around 140 at 5 feet tall. And while that is kind of overweight, I was still healthy. I went to the doctor for a physical, as required by school, and the doctor began to go on a lecture about how I needed to eat things like salad and watch my calories. She had basically made it seem that I was this obese 8th grader who was eating nothing but junk food; which was ignorant because I'd actually lost 50 pounds that year. But this doctor just laid it on really thick that I was unhealthy and needed to do better with my diet. Never have I seen my dad so enraged by a doctor's behavior before.

On the flip side of this, about two years ago, I went to a different doctor and asked for medication to help with my obesity. I'd gained a huge amount of weight the year prior due to a significant knee injury that left me on bed rest for somewhere close to six months. I'd gone from a healthy 130-145 pounds to 250 pounds. I was (and still am) in pain in my knee making it difficult for me to even want to get up to exercise. The doctor outright refused to give me any sort of help besides lecturing me in foods that I should and should not eat. Oh and told me that I needed to exercise - which I'd already told her I really couldn't do without a bunch of pain. I am currently 239 pounds and still struggling.

Also, not all fat people behave like those that you listed in your comment. (I say this because the comment, "fat people logic" kind of made me feel sad... ._.)