Can Guinea Pigs Eat Tomatoes? (Poison Concerns, Benefits, Risks)
Tomatoes are a popular fruit found abundantly on dinner plates and veggie trays worldwide. Tomatoes also pack a punch in the nutritional department, rich in vitamins, minerals, and antioxidants. But can guinea pigs enjoy this juicy red food too?
As a general rule, guinea pigs can eat tomatoes a few times a week in small amounts. However, never feed unripe tomatoes, leaves, or stems as these are toxic to guinea pigs.
Tomatoes are also acidic, so feeding too much can cause painful mouth sores for your guinea pig.
However, they have a lot of health benefits as long as they are prepared and fed properly.
I’ll cover everything you need to know to safely feed this delicious fruit to your guinea pig throughout the article below.
You can also check out the Guinea Pig Food Chart for an alphabetical list of everything your piggy can eat and how often they can have it, along with calcium and Vitamin C levels for each food.
*Important Note: The quantity of tomatoes shown in the photos is for visual purposes only and not indicative of the correct amount to feed your guinea pig in one serving.
Nutritional Value of Tomatoes for Guinea Pigs
Tomatoes contain a healthy balance of vitamins and minerals that can benefit your guinea pig’s health. I’ll list the nutritional facts of small grape tomatoes per 100 grams in the table below:
| Nutrient | Amount |
| Calories | 31 kcal |
| Protein | 0.83 g |
| Fat | 0.63 g |
| Sugar | 2.63 g |
| Carbohydrate | 5.51 g |
| Fiber | 2.1 g |
| Vitamin C | 27.2 mg |
| Calcium | 11 mg |
| Phosphorus | 28 mg |
| Magnesium | 11.9 mg |
| Potassium | 260 mg |
| Vitamin K | 4.2 µg |
Benefits of Feeding Tomatoes to Guinea Pigs
Tomatoes offer several nutritional benefits to your guinea pig when included as part of their weekly veggie rotation. I’ll cover some of these potential benefits below.
Tomatoes Contain an Assortment of Vitamins, Minerals, and Antioxidants
Tomatoes are a high source of many nutrients, including Vitamins K, A, B6, folate, and potassium. Vitamin K is crucial for blood clotting and bone health, while Vitamin A keeps the eyes sharp and healthy.
Potassium is used for blood pressure control, and it’s also responsible for regulating fluid in the body. Adequate potassium intake can even lower the risk of heart disease and kidney stone development.
Tomatoes are also high in water content, making up 95% of the fruit. It’s also a good source of insoluble fiber, which is important for digestive health.
Additionally, the low levels of calcium in this fruit make it a great choice for guinea pigs that have been prone to developing stones or bladder sludge in the past.
Adult guinea pigs absorb more calcium from their foods than we do, meaning they benefit from having a diet consisting of mainly low-calcium foods.
Tomatoes Provide a Good Source of Vitamin C for Guinea Pigs
Tomatoes also contain some Vitamin C, although they have lower levels of this essential nutrient than foods like sweet bell peppers, broccoli, and guava fruit. For example, one cherry tomato contains just over 2mg of Vitamin C.
Most guinea pigs require a minimum of 10mg of this nutrient per day. Tomatoes are a great addition to the diet, but it’s a good idea to feed other high Vitamin C foods along with it to ensure your guinea pig gets plenty of Vitamin C daily.
Tomatoes Contain a Variety of Antioxidants
Tomatoes also contain various antioxidant compounds, including lycopene, which has been linked to countless health benefits. Antioxidants play a big role in the body, fighting off infections and diseases. Consuming foods rich in antioxidants can also lower the risk of heart disease and many forms of cancer.
Risks of Feeding Your Guinea Pig Tomatoes
While tomatoes can be a healthy addition to your guinea pig’s diet, it’s important to prepare them properly and feed them in appropriate quantities to eliminate any potential health risks.
Unripe Tomatoes and Leaves Are Poisonous to Guinea Pigs
The most critical factor when feeding tomatoes is the poisonous compound found in all green parts of the plant and fruit. The tomato plant comes from the nightshade family, a group of plants known to be toxic.
Tomato plants contain a glycoalkaloid poison called “tomatine.” This is similar to “solanine,” which is found in other nightshade plants such as eggplant.
Even small quantities of these plants can be quite toxic to guinea pigs due to their small size.
For this reason, it’s crucial to never feed tomato leaves, stems, vines, or unripe tomatoes with green on them. Be sure to remove the tiny leaves from the top of the fruit before feeding as well.
Oxalic Acid in Tomatoes
Tomatoes are also relatively high in oxalic acid, containing about 50mg of oxalates per 100g. As long as you feed tomatoes in small amounts, this is unlikely to cause any harm.
However, too much acidity can sometimes cause sores to form in the mouth. It can also cause cheilitis, which is a condition causing inflammation in the lips.
Acidity can also cause diarrhea or stomach pains in some guinea pigs, so it’s important to be observant of your particular piggy. This is also why it’s important to feed tomatoes in relatively small quantities and not on a daily basis.
It’s also best to limit other foods that are rich in oxalic acid at the same time as you feed tomatoes. This includes spinach, swiss chard, beets, and raspberries. Oranges, cherries, and pomegranates are also higher in other natural acids.
Tomatoes Contain Some Natural Sugars
Tomatoes also contain some sugar, but compared to most other fruits and some vegetables, the sugar levels are not overly high. For example, strawberries, carrots, and corn on the cob all contain more sugar than tomatoes.
Allergies or Bad Reactions to the New Food
Like with other foods, there is always a chance that your guinea pig is allergic or has a bad reaction to tomatoes. This is rare, but it’s always important to introduce new foods gradually and keep an eye on your guinea pig in case they have an adverse reaction.
Can Guinea Pigs Eat Tomato Leaves and Stems?
As mentioned above, tomato leaves, stems, vines, and unripe tomatoes contain a poisonous compound called “tomatine.”
All the green parts can be very toxic to your guinea pig if consumed. It’s important to ensure that the tomato is entirely ripe with no green before offering it to your guinea pig.
Also, be sure to remove any leaves or stems if there are any, including the tiny leaves from the top of the tomato. If you grow your own tomatoes, do not offer your guinea pig any of the leaves from the plant.
Can Guinea Pigs Eat Cherry Tomatoes?
Small cherry tomatoes and grape tomatoes are safe to feed your guinea pig. Some pigs even prefer cherry and grape tomatoes to the larger ones like beefsteak.
One small cherry tomato is also the perfect portion to feed your piggy at a time. To feed cherry tomatoes, you can cut them in half or offer them to your guinea pig whole.
Smaller cherry tomatoes can pose a choking risk to guinea pigs if they try to eat them too quickly, so it’s a good idea to cut them in half to eliminate this risk.
Can Guinea Pigs Eat Tomatoes With Seeds?
Guinea pigs can eat tomatoes with the seeds intact. There is no need to remove them as the seeds are small, soft, and easy for guinea pigs to chew and digest.
Can Guinea Pigs Eat Tomato Skin?
It is perfectly safe to feed tomatoes with the skin to your guinea pig.
In fact, the skin contains the highest concentration of lycopene and other antioxidants than the flesh of the tomato.
However, be sure to wash the tomato thoroughly before feeding it to your guinea pig.
How Often Can Guinea Pigs Eat Tomatoes?
Guinea pigs can eat one whole cherry tomato or an equivalent-sized chunk of a larger tomato a few times a week.
Some people feed small amounts of tomato daily, but this can sometimes lead to mouth sores over time due to the natural acidity of tomatoes.
Never feed a whole large tomato at once, as this can cause diarrhea and severe stomach pains from consuming so much oxalic acid in a short time.
Tomatoes make an excellent addition to your guinea pig’s staple veggie rotation, but be sure to supplement them with leafy greens like cilantro, kale, bok choy, turnip greens, dill, arugula, and parsley.
Do Guinea Pigs Like Tomatoes?
Tomatoes are popular with many guinea pigs. I know some that would inhale tomatoes all day if they were allowed.
If your guinea pig has never tried tomatoes before, it’s best to introduce them slowly due to the acidity levels.
If they don’t eat it right away, keep trying for a bit. Guinea pigs often take time to adapt to a new food, especially one with a unique flavor like tomatoes.
All guinea pigs have their own preferences, so some may decide they don’t like tomatoes. If this is your guinea pig, there are many other options you can try that are delicious and high in nutritional value. Some great ones you can try are apples, dandelions, basil, lettuce, celery, radicchio, endive, and zucchini.
Can Baby Guinea Pigs Eat Tomatoes?
Baby guinea pigs over four weeks old can eat tomatoes in small quantities. Be sure to introduce them slowly, particularly due to the high levels of oxalic acid in this fruit.
Tomatoes are a good source of Vitamin C and other nutrients for babies and adult guinea pigs alike.
In addition, introducing your baby guinea pig to a variety of foods at a young age can prevent them from becoming fussy eaters as adults.
Are Tomatoes Toxic to Guinea Pigs?
Ripe red tomatoes are not toxic to guinea pigs. However, beware of unripe tomatoes, leaves, and stems.
These contain a poisonous compound called tomatine which can harm your guinea pig.
Always ensure that the tomatoes have no traces of green before feeding them to your piggy.
Learn more: 45 Things To Never Feed Your Guinea Pig
How to Safely Prepare and Feed Tomatoes to Your Guinea Pig
To feed tomatoes to your guinea pig, first ensure that they are 100% ripe. Remove any leaves or stems, including the tiny leaves at the top if there are any. Rinse the tomato thoroughly to remove traces of dirt and pesticides. Always feed tomatoes raw and uncooked.
If your guinea pig is new to eating tomatoes, introduce small amounts by hand or leave them in the cage for your pigs to try at their own pace.
Be sure to remove any uneaten food after a few hours, so it doesn’t go bad in the enclosure.
Observe your guinea pig for several hours after they eat the new food. If you notice any diarrhea or change in behavior, feed less of it next time or offer different veggies in the future.
If all looks good, you can gradually increase the amount you give your guinea pig next time.
If your guinea pig doesn’t seem interested in eating the tomato, try it a few more times. In the wild, guinea pigs would often test a new food by nibbling the tiniest amounts several times to ensure it wasn’t poisonous. Pet guinea pigs often inherit this ingrained behavior, and this is why it sometimes takes them a while to accept a new food.
More Fruits and Vegetables That Guinea Pigs Can Eat
Did you know that guinea pigs can also eat sweet potato, mango, and watercress?
These foods all contain a variety of nutrients that can boost your guinea pig’s health in numerous ways. They can also eat thyme, cauliflower, broccoli rabe, and so much more!
For a complete list of all the fruits and vegetables that guinea pigs can eat, check out our article, Complete List of Safe Foods for Guinea Pigs.