You have a "dilemma" that many obese would love to have.. :) You probably have high metabolism... :) so you should try exercises that build muscle mass that means heavy weights and slow reps. protein shakes are must or else you won't put on muscle mass and probably even lose more weight... :) also i wouldn't think it's the case but have your stomach checked for worms just in case... usually those who eat a lot but don't gain weight are those with either high metabolism or have worms that eat away precious food nutrition.
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