When i eat a lot of food

Hahaha me too brah...so all of you can suck mine too

You have high metabolism. I do too. If you eat a ton of crap food, you'll get fat in the future. Stop rubbing it in because you'll end up fat too.

Came here to mention tapeworms, but seeing as someone beat me to it, I'll just chime in about metabolism slowing down as you age. Also, it's entirely possible to look healthy on the outside, and have clogged arteries, destroyed lungs & liver, etc. Not to mention being skinny doesn't always = healthy.