For guinea pigs, some foods are fine but should only really be eaten in moderation. Fruit, for example, is quite sugary and acidic, and can result in painful little sores around the guinea pigs mouths if fed to them too often
The preferred basic diet for guinea pigs is unlimited amounts of timothy or other low-calcium hay, supplemented with smaller amounts of commercial, high-fiber, timothy-based guinea pig pellets.

When should guinea pigs eat, and what should you feed them? Plan out their diet and keep a schedule to keep these small pets healthy.

Learn about the veterinary topic of Diet for a Guinea Pig. Find specific details on this topic and related topics from the Merck Vet Manual.

The following are a list of plants safe for your guinea pig to eat: Beetroot (care with leafy tops as high levels of oxalic acid) Bell peppers (all colours) Broccoli (and its leaves, including purple sprouting varieties) Brussel sprouts