It is fairly normal to dream about food - this is one of the more common dreams but the interpretation of eating can vary.
Some studies suggest eating is associated with sexual satisfaction.
Eating might also signify a reward for some task or even that you are concerned with survival itself.
It has also been suggested that eating alone signifies rejection or that you feel cut off from other people. Medically, it could suggest you are hungry or have low blood sugar.
Look up the type of food or drink in the dream for more information.