A guy walks into the doctor's office.

He's got a cucumber stuck up his nose,
a banana in one ear and
a carrot in the other.

He says, "Doctor, what's wrong with me?"

The doctor replies, "Well, it's obvious!
You're not eating properly!"

I don't write 'em, I just pass 'em on!

Well, probsbly I need to eat veggies, (believe, I don't like almost any of them), but the punch line "escapes" me.

Okay, I admit it is not one of the best jokes.

But the vision of the guy with fruits and vegetable stuck all over IS kind of funny!

The punchline is:
You are not *eating* properly! Get it?

I think the joke lacks a line somewhere but the idea of all those veggies protruding from his face is mighty funny, specially when I don't like veggies!!!

That might be subtle for me. You mean to eat, food has to go in the mouth, actually chew and swallow? I enter that as an advisement.