My boyfriend is 24 and skinny. He has always been like this and I'm pretty sure he always will be because his Dad is the same. He doesn't seem to think that he will be able to bulk up but I am convinced that with the right diet, he would be able to. At the moment, he only really eats 3 meals a day and doesn't really snack in between. He eats what he wants (including junk food) and doesn't put on any weight at all. We both go to the gym but he feels it's pointless him trying to build up because he thinks he will only get toned (which he is anyway really) and not bulk up. If he has the right diet, is it possible for him to get bigger? He obviously has a very fast metabolism.