I'm sure all of you know at least a skinny person who seems to eat a lot but not gain any weight. I know I do. You may wonder how is this possible. Is there a black hole in their stomach? Does their body not process calories? Are they human?
Well, I found an article online that can help explain some of this. The article, which is shown below, talks about the three main body types people have. They are: ectomorph, mesomorph, and endomorph.
The skinny person I was talking about in the first paragraph is most likely an ectomorph. An ectomorph is a person who finds it very hard to gain weight. Typical traits of an ectomorph include fast metabolism, small shoulders, flat chest, and lean muscle mass.
You can read more about ectomorphs, and the two other body types here: What is Your Body Type?