I wonder if it is drug related.

I cannot do portion control on milk! The milk I buy, 2% Lactaid, only comes in half-gallons. It does not come in quarts. I would like to buy it to make hot cocoa in the morning. I would feel nourished, I like to start the day with a hot drink, and hot cocoa has a tad amount of caffeine - not much but something that is good for my low BP. I make very yummy hot cocoa from the best cocoa powder. But when I buy milk, and I try every quarter or so, I keep drinking it and am done with the half gallon in about 15 hours. This is completely ridiculous. I am going to try again soon and see what happens, but I wonder if anyone else has experienced it and whether it can be drug-related. I used to keep milk in my fridge without a problem.

I do not have trouble with portion control on all other foods, including chocolate.