Even though a lot of people might tell you to 'just eat a lot of junk food' (and you think that you can eat whatever you want because you don't gain weight anyways) you might want to be careful.
Many people believe that naturally skinny people don't have to think about what they eat, that they can eat whatever they like. But just because you can eat whatever you want without gaining weight, that does not mean it is healthy for your body to be on a fast-food diet all week. In fact, naturally thin people often don't realize the influence junk food has on their body because their outer body does not show any symptoms -it doesn't get thicker. However, even though your outer-body does not show any symptoms, your inner body might suffer.
Physical therapist Ajith Jain says that naturally thin people should avoid fast food just like everyone else.
"If they eat that they are prone to Hypertension and Heart diseases as anyone else," says Jain.
He recommends naturally thin people to eat healthy "good nutrituous food" as well.