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Yes, guinea pigs can eat bananas, but only as a small treat. Give one thin slice, about 1 cm (half an inch) thick, once a week at most, with the peel off. Banana is one of the most sugary fruits you can give a guinea pig and has little vitamin C, so Burgess and the PDSA both advise only small, occasional amounts.
| Safe? | Yes, as a treat |
| How much | 1 thin slice, about 1 cm (half an inch) |
| How often | Once a week at most |
| Best served | Fresh, ripe, peeled |
| Watch out for | Weight gain, soft droppings, sticky mouths |
Are bananas safe for guinea pigs?
Yes. The PDSA and Burgess both list banana as a safe fruit. Burgess's banana guide says guinea pigs don't naturally eat fruit, so it should only be an occasional treat, and that its sugar can lead to weight gain. VCA adds that too much fruit can upset the gut bacteria and cause serious diarrhoea.
The numbers explain the caution. Worked out from the Guinea Lynx food chart, banana has about 12.5 g of sugar per 100 g (3.5 oz), more than blueberries or watermelon and two and a half times as much as strawberries. It has only about 9 mg of vitamin C per 100 g, so it does little for a guinea pig's daily need of 10 to 50 mg.
How much banana can a guinea pig eat?
One slice about 1 cm (half an inch) thick, or half a slice for a small guinea pig, once a week. That is roughly 10 g (a third of an ounce), close to the 11 g Guinea Lynx uses as a 10-calorie portion. Don't give other fruit on banana day. The rest of the day stays the same: unlimited hay, about one cup of veg and about a tablespoon of pellets, as our guinea pig diet guide explains.
How to prepare banana
- Pick a ripe banana. Yellow and firm, not black and mushy.
- Peel it. Only the flesh is listed as safe.
- Cut one thin slice. About 1 cm (half an inch), or halve it for smaller guinea pigs.
- Hand-feed it. A slice of banana is a great reward during taming.
- Wipe up. Banana is sticky, so clear away any smears so they don't spoil in the cage.
Peel, chips, bread, smoothies and baby food
- Peel: we'd leave it out.
- Banana chips and dried banana: no.
- Banana bread, cake or muffins: no. Flour, sugar, butter and egg.
- Smoothies, milkshakes and yoghurt: no. Burgess calls dairy particularly dangerous for guinea pigs.
- Banana baby food: no. Pureed fruit with nothing to chew.
Who should skip banana?
Overweight guinea pigs, those with a sensitive stomach or recent diarrhoea, and babies not yet fully weaned are better off without it.
What to offer instead
If you want a sweet treat with more vitamin C and less sugar, a strawberry is a better pick, and blueberries or a sliver of apple are other options. For everyday greens, see what can guinea pigs eat and our guinea pig care guide.
Banana questions
Can guinea pigs eat banana peel?
We'd leave it out. None of the welfare or vet sources we use cover banana skin, it is tough and bitter, and the outside of the fruit may carry sprays from growing and shipping. The flesh is the part listed as safe, so peel the slice before you offer it.
Can guinea pigs eat dried banana chips?
No. Drying concentrates the sugar, and banana chips are usually fried and often sweetened or coated. Woodgreen warns against mixes high in dried fruit for guinea pigs. A thin slice of fresh banana is the only kind worth giving.
Can baby guinea pigs eat bananas?
Wait until they are fully weaned and eating hay, pellets and greens well. Sugary fruit can upset a young gut. After that, a sliver of banana the size of your little fingernail is plenty to start with, and no more than once a week.
Why is my guinea pig obsessed with banana?
Because it is sweet, soft and strongly scented, and guinea pigs love sugar as much as we do. That is exactly why it needs limits. A guinea pig that begs for banana will happily eat it in place of hay, which is bad for teeth, weight and gut health.
