'Honey Boo Boo' -- Sugar Bear's Nightmare ... NO MORE Fried Food!!

Honey Boo Boo's dad is in danger of getting his redneck card pulled -- 'cause TMZ has learned Sugar Bear's health is forcing him to cut out ... FRIED FOOD!!!

Sugar Bear was released from the hospital on Thursday after checking in last week with severe chest pains. Doctors diagnosed him with pancreatitis.

Mama June tells us Sugar's “feeling pretty good, for the most part” -- and doctors say if he takes his meds he should be able to keep flare-ups under control.

But June says doctors also advised Sugar to lay off fried and spicy foods -- no small feat for anyone living in the deep south.

June says the family plans to eat the same stuff they'd normally eat -- which ain't exactly Lean Cuisine -- and Sugar will just have to sit out on fried chicken nights.