Not all obesity is due to fast food. Some is caused by health issues. I rarely eat fast food, (A couple times a year) and I reduced my diet from 3300 calories a day when I was in good health (I weighed 155-175 pounds for years). Now it is less than 1800 calories a day, yet I continued to gain weight until I weigh 270 pounds. Every time I get a low level infection, I put on weight. As soon as its gone, I lose the weight, and usually pretty fast. The first time this happened, I dropped from 223 pounds to 175 pounds in under a month, while eating over 3000 calories a day.
The infections tell my body to store fat, and slows down my metabolism. If I reduce the calories any lower than 1800 per day, I quickly lose muscle mass. The biggest problem is to find a doctor who even gives a damn. The last one said, "Well, at least its just low level. It doesn't show up in your blood work, so you can just live with it."
The problem is that long term low level infection causes damage to the heart. I have lost so much strength that I can barely walk through a few isles at the grocery. My diet was approved by a dietitian, who suggest that I add a half cup of orange juice for more carbs, but the rest of the diet i prepared was excellent.
I am in constant pain, but the VA isn't allowed to do what I need to get well. I don't expect to be alive much longer, if I don't have two infected teeth removed in the next week or so. I wake up screaming in pain, and so dizzy I can barely stand up. The center of one of the infected teeth is black and crumbling. There is nothing to support the enamel, so i have razor sharp pieces that cut my tongue and lip. That same doctor told me "I've seen worse"
I had one of the abscesses break a few years ago. I spent 12 hours sweating the crap out of my blood stream. By the time it was over, I had to burn the pajamas I was wearing, along bed sheets and pillow. I had to buy a new mattress and box springs, because I couldn't get the stench out of it. It took about two weeks to get it out of my skin, as well. I alternated between being afraid I was going to die, and praying that I could.
This is my fifth round of badly infected teeth, since 1972. It is caused by the way the roots curve back into the bone, creating pockets that allow the infection to form pockets. X-rays show no signs of damage in the tooth, except at the root, were there is nothing you can do to prevent the problem.