Barry often found himself at Hinkles. This was because he was often hungry. It was a perk of his super speed, it messed with his metabolism. Barry was apparently not the only thing speedy, his metabolism was speedy as well. So he could eat quite a bit and not gain an ounce.
He entered the restaurant, trying to not be too fast in the process. It worked. Kind of.
"Why am I always suddenly more hungry whenever I come in here?" he asked no one in particular. Exactly at the time his stomach grumbled.