Disease that you eat

I am something that you eat
But I am also something which is called disease
I am something that is grown in the ground but I am not veggie
But I am also something that can grow mainly on your feet.

Who am I?

Sorry for such an awful rhyming...

You are a

Fungus

I am something that you eat

But I am also something which is called disease

One can have a fungal infection, like Thrush in the mouth, or Athlete's Foot* on the feet.

I am something that is grown in the ground but I am not veggie

Fungus usually grows on or in the ground, though it can grow in a lot of places

But I am also something that can grow mainly on your feet.

See above, re: Athlete's Foot.

* I am not linking to this one, because there's a gross-ass picture there

• Made me look! Arguably, the other's even more so!?!! – Paul Evans Mar 1 '16 at 21:44
• @paulevans haha I thought about that after posting, but for some reason it just doesn't gross me out as much – question_asker Mar 1 '16 at 21:47
• oh really? i can change that – manshu Mar 1 '16 at 21:48
• @manshu nooooooooooooooooooo... – Paul Evans Mar 1 '16 at 22:02
• Guys... what happened here. – question_asker Mar 2 '16 at 13:11

Even though the question is answered. But I found out another answer that I'd like to share. It is

Corn

I am something that you eat

Yup.

But I am also something which is called disease

Yes, there really is a disease called corn.

I am something that is grown in the ground but I am not veggie

Speaking from a botanical point of view, corn is classified as a grain. And yeah they are grown on the ground.

But I am also something that can grow mainly on your feet.

As you can see from the linked pictures