Being a 19 year old guy, I am an expert when it comes to the eating habits of 19 year old males
. Anyhow, I say you should cook something simple for him, like chicken or spaghetti, then teach him to do it himself. I'm a guy, and lived on ramen noodles and pringles until my mom took me shopping and suggested stuff to eat like turkey sandwiches and chicken and veggies. Now I cook for myself and my roommates, the food is way healthier, and way better. Just encourage him, he should follow