 [ Symptoms ] i am a 21 year old guy trying to lose weight on a 1 200 1 500 calorie daily diet does it matter what i eat  does it matter as long as i am eating fewer calories than i am burning [ Disease ] any multivitamin is fine some are formulated just for teenagers a health food store can help you select one the issue is not just vitamins but basic nutrition many teenagers and pre teens dabble with becoming vegetarians but have absolutely no idea on how to do it nor do they have a knowledge of general nutrition make them attend a class on vegetarian lifestyle also watch their weight carefully weight loss or obsession with weight can signal an eating disorder