Can't get enough!

Angelo has started a new problem. He is obsessed with his favorite foods. If I buy him a bag of sunchips, he has to eat all of them or keep them in his room to eat later. I can't make cookies because he has to eat them all! It is like he can't help himself. I tried to hide the cookies we made today and he is obsessed with trying to find them. He will fall asleep and actually talk in his sleep that he wants a cookie. It is not all foods.......just certain ones. I buy oreos for Art, my husband and he has to hide them in our room. He gave Angelo 1 cookie. Wrong thing to do...........He searched the house until he found those Oreos. In our room in a shoebox. The little sneak put them back in the shoebox but left a trail of choc. cookies with the middle licked out. Don't know what to do? Now another thing to hide and keep away. We can't leave him in the bathroom alone because of the things he gets into. I had to put a lock on the outside of the door. Now I am having to put up a baby gate to the kitchen. Yikes! and now maybe a lock on the outside of my door. I do not worry about the weight but he makes himself sick to his stomach because he doesn't know when to stop. I am going to have to keep him on a food schedule and lock the cabinets. Maybe a chart on the wall so he knows when it is time to have meals and a time to have a snack. ????????