Twinkies, even better, deep fried twinkies. And if you're really desperate some drugstores sell nutrition bars that add weight onto your body. But I don't know why you'd want to be fat...
Eat loads of sweets, crisps, and drink a lot of fizzy juice and sit on the couch watching T.V. all day, keep doing this for 45 days, then u will be fat. But make sure you don't eat too much salty and...