I got through phases of obsessing over certain types of food. It's not particularly healthy but I used to quite happily eat the same meal every night for months. Other times I'll go nuts over a few days and then get over it. Two days of eating nothing but jelly (or jell-o for those freaks across the big blue thing ;)) was one of the more interesting experiments.
Currently my big downfall is banoffee pie. They do a particular brand in Spar that I can just om nom nom. I'll eat the whole pie, it's scandalous. Sainsbury's bakery cookies often get me (all soft and chewy).
My biggest drink is always water, but currently I have a real soft spot for coffee and cream. I'm off caffeine so it's decaf, but still... That is my hug in a mug.
Green tea is also good. When I'm on a green tea binge I'll get through scary amounts of the stuff.
Given my epic sweet tooth combined with an underactive thyroid gland, it's pretty impressive that I'm not a whale. Possibly helped by the fact that I forget to eat from time to time!