Why do people gain weight?
There's a lot of reasons, kinda a broad question. A few ---
-- Puberty, you gain weight and it goes away as you grow -- Over-eating/eating too many bad foods, it's okay to indulge once in a while, and normal to over-eat on occasion, but be aware of it! -- Genetics, this is also a reason. My dad was overweight, my mom was underweight. I think I have the fat genes, so I work hard to not gain weight quickly and keep my metabolism up. You can't completely blame this reason for being overweight. -- Not excerisizing, I excercise 30-60 minutes a day, because I'm trying to lose some weight. Most people should work out for 30 min/day, 3-4 days a week -- Diabetes, I'm not sure about this reason. You may want to look this up if you're wondering.
Please note: if you're very active, and you're gaining weight/overweight on the BMI scale, you probably have more muscle mass than fat mass. Muscle weighs more than fat, so talk to your doctor if you're concerned.
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either becuase of lack of exercise, over weight kids, diabetes, also if its passed through the family... laziness, thoes types of things