It's the dude's bodily fluids, I think. Ingesting them once removes your sense of taste, and then ingesting them again brings the sense back, plus gives you a pretty good sexual high. That's why he spit in his drink in the first chapter.

I'll bet the sense coming back is temporary, so you have to keep going back to him for more.

Well, I think that guy is gonna have some things to say about it...

Remember to smile, everyone!

God, this is tragic.

Yikes, that's gruesome. I feel kinda bad for her.

Aw, what good boys!

Oops, got poisoned.

Asking for food off a stranger's plate? That's bizarre, even for a brainless story like this.

Why didn't they want that guy around, again? To me it seems like having some people without abilities might be extremely useful in counteracting them.

Yep, that's what I thought as soon as they mentioned that the dude was getting younger. It was obvious since we already knew members were going missing.