Best Carbohydrates-Rich Foods for Guinea Pigs

Ranked by carbohydrates content among foods safe for guinea pigs in the Creature Feast catalog.

Timothy Hay per 100g dry: ~45g structural carbohydrates (cellulose + hemicellulose) Timothy hay is the single most important carbohydrate source for guinea pigs. Its structural carbohydrates — cellulose and hemicellulose — are fermented slowly in the cecum by beneficial bacteria, producing volatile fatty acids that provide steady, sustained energy. This is exactly the type of carbohydrate guinea pig physiology is designed for. Unlimited timothy hay should form 80% or more of the diet.

Romaine Lettuce per 100g: ~3.3g carbohydrates (mostly simple sugars and some fiber) Romaine lettuce provides small amounts of easily digestible carbohydrates alongside its high water content. The carbohydrate load is low enough that it does not disrupt cecal fermentation, making it a safe daily vegetable. It also provides a crunchy texture that encourages chewing and dental wear.

Bell pepper per 100g: ~4.6g carbohydrates (mostly natural sugars and fiber) Bell peppers contribute moderate carbohydrates in a well-balanced form — some natural sugars for quick energy and fiber for gut support. The carbohydrate content is low enough to be safe daily, and bell peppers deliver their carbohydrates alongside exceptional Vitamin C, making them a nutritional powerhouse.

Carrot per 100g: ~9.6g carbohydrates (of which ~4.7g sugars) Carrots are higher in simple sugars than most guinea pig vegetables, so they should be offered in small amounts. A thin coin-sized slice provides quick energy as a treat, but too much sugar from carrots can disrupt cecal flora. Carrot tops, by contrast, are low in sugar and can be fed more generously.