What and how much do guinea pigs eat?

Guinea pigs can eat all sorts of different foods. They can eat apples, oranges, carrots,
celery, kiwi, and lots of other fruits and vegetables. They can also eat guinea pig food
from the pet stores and timothy hay. A fully grown guinea pig eats about one hand full of guinea pig food daily plus some hay. Various fruits and vegetables can be mixed into the guinea pig's diet also. Enough food for a whole day should be given daily, but
fruits and vegetables shouldn't be left in a guinea pig's cage for a long period of time.