Guinea pigs benefit from a diet of fresh grass hay, such as timothy hay, in addition to food pellets, which are often based on timothy hay.
Feed your guinea pig about a cup of fresh vegetables daily.[1] X Research source The key is to provide it with a lot of variety so that it gets a balanced diet. Veggies that are good for guinea pigs include celery, off-the-vine tomatoes, cucumber, corn (and corn husks), and bell pepper.

Discover essential dietary tips for guinea pigs to ensure their health and happiness. Learn what veggies and hay are best!

Guinea Pig Diet Guide. Healthy Food For Guinea Pigs.Guinea Pig Fruits And Veggies List. Zucchini For Guinea Pigs Infographic.

Guinea pigs need about one cup of fresh fruits and vegetables daily to supplement their regular diet of hay and pellets, so it's important to include a balanced variety to make sure they're getting all the vitamins and minerals they need.
However, guinea pigs are good at hiding illness and pain. If you suspect your guinea pig may be feeling unwell their eating habits have changed, or they arent going to the bathroom as frequently you should bring your pet to your veterinarian right away for an examination.