1) Emotional eating (eat out of boredom, depression, anger, etc) Yup - depression (abused child), abandonment issues, etc.
2) Pleasure eating (you simply LOVE food) Yup, love, love, love food! One of the few things I had to look forward to.
3) Lack of exercise - Yup - Not to place blame or not accept responsibility, but as a child, no one in my household exercised or knew anything about nutrition, and by the time I realized I needed to do something about my weight, it's hard to take decent walks. But now, very recently, I do extra walking when I can, and will increase.
4) No portion control - Yup. Especially when I was younger. I could eat 3 plates at an all you can eat buffet. Too much food!
5) Too much failed dieting (yo-yo dieting syndrom) That too.
6) Genetics - Don't know about this one. Never knew my parents.
7) A little bit of everything - Obviously
8) Other - Probably