It is said that Odin does not need to eat anything. That the only thing He consumes is the Mead of Poetry and He gives the rest of His food to Freri and Geki–His two wolves. I…disagree with this for two reasons. Both of which can be found in the story, The Theft of Idun’s Apples.
Idun is the Norse Goddess of Spring and Youth, and She guards an orchard in which Her magick apples grow. These apples work as a sort of fountain of youth. Whoever eats them remains young. Without them, the person (or God) would age the same way we humans do.
In The Theft of Idun’s Apples, Loki makes a deal with a giant-in-disguise to lead Idun across Bifrost if the giant (in the form of a giant Eagle) would stop dragging Him across rough terrains. Both parties keep Their end of the bargain, and when Idun is captured by the giants, Her apples are gone as well. All of the Gods begin to age. Thus, Odin must eat Her apples in order to retain His youth.
The reason Loki was drug across rough terrains to begin with is because He threw His staff into the body of the Eagle when it took all of the Gods’ food. Loki, Odin, and Honir had gone wandering across Midgard, just wanting to explore new (to Them) territory and were getting hungry. So, They captured, killed, and attempted to roast an ox. I say “attempted” because the Eagle was preventing the meat from cooking even though it was spitted above a fire.
So it’s reasonable to say that Odin does consume things other than the Mead. He may not absolutely require it, but He does eat/drink other things.