How Do I Get Fatter?

Anonymous
I'm quite skinny and its difficult to gain weight, I know, eat more but it doesn't work.
I tried eating only fast food for two weeks and nothing. I've tried eating larger portions and have lots of carbohydrates but still nothing.
I can eat a lot and I have a large appetite, I'm like shaggy from Scooby doo, I can eat loads but not get fat.
I'm always asked why I'm so skinny or why I don't eat but I do.
Any help?
Updates
+1 y
I'm guessing I have a high metabolism but how do I know for sure, could this be an illnesses?
How Do I Get Fatter?
9 Opinion