I need help with a picky eater!!?

My little brother (18) and my mom come over every night to eat dinner at my house while my husband is deployed. My brother has just recently decided he also wants to join the military but needs to lose weight. I need ideas of recipes for a picky eater. Low carb low fat and just all around healthy meals. i want to help with this process b/c i think its a great decision for him, and I want to support him with it and not try and force foods he doesnt like b/c then he will just end up at taco bell when he leaves. please help