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Can Guinea Pigs Eat Iceberg Lettuce? (Serving Size & More)

Tim Rhodes
Written by Tim Rhodes Last Updated: September 23, 2021

Can guinea pigs eat iceberg lettuce?

Just like for humans, a guinea pig’s diet needs to be balanced and healthy.

Although timothy hay is the main source of food for these cute little rodents, they also need vitamins and minerals that are not present in timothy hay.

As guinea pigs can eat different kinds of herbs, fruits, and vegetables, not all are equally beneficial for them.

Make sure to feed them with produces that has nutritional value for them.

Let’s go ahead and cover the nutritional aspects of a guinea pig’s diet and learn whether guinea pigs eat lettuce, including iceberg lettuce.

Can Guinea Pigs Eat Iceberg Lettuce?

Guinea pigs eat iceberg lettuce, but it won’t provide them any significant nutritional value.

The problem with feeding your guinea pig iceberg lettuce is that this type of lettuce has high water content.

Therefore, eating too much of it can cause bloating and stomach aches in your guinea pig.

Although it is of little nutritional value, iceberg lettuce still has its pros and cons, as we are going to see in the section below.

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What Are the Health Benefits of Iceberg Lettuce?

Iceberg lettuce contains carbs, a significant source of energy, and proteins for building muscles for your guinea pigs.

The lettuce also contains Omega 3 and omega-six fatty acids, which are essential in reducing your guinea pig’s cholesterol levels, reducing blood pressure, and maintaining a healthy heart.

Iceberg lettuce also contains vitamin A for good eyesight, Vitamin K for blood coagulation, and Vitamin E, an essential antioxidant.

Although it has a low level of Vitamin C, it can still help prevent scurvy, which is characterized by weight loss and swelling of the skin.

The good thing about feeding your guinea pig iceberg lettuce is that it also contains vitamin B.

This vitamin is important for the metabolism of your guinea pig.

Besides, it also stimulates the production of serotonin which is good for sleep.

Magnesium and potassium in the lettuce prevent muscle pains, maintain electrolyte balance, and keeps the heart of your guinea pig healthy.

Iceberg lettuce also contains copper, zinc, and iron elements, which increases red blood cells in your guinea pig.

What is the Nutritional Value of Iceberg Lettuce?

A serving of 100gms of iceberg lettuce contains:

  • 14 kilocalories
  • 2 grams of carbs
  • 9 grams of proteins
  • 2 grams of fiber
  • 2 grams of sugar
  • 1 gram of fat
  • 52 milligrams of omega 3
  • 21 milligrams of omega 6
  • 10%of vitamin A
  • 5% vitamin C
  • 1% of vitamin E
  • 30% of vitamin K
  • 1% of vitamin B2
  • 1% of vitamin B3
  • 2% of vitamin B6
  • 70% folic acid
  • 2% calcium
  • 2% iron
  • 2% magnesium

It also contains: 1% phosphorus, 4% potassium and 1% zinc.

Are There Downsides to Feeding Guinea Pigs with Iceberg Lettuce?

While the good thing about feeding your guinea pig iceberg lettuce is that it is rich in fiber, the bad thing is that it has high water content.

When you combine a lot of water with foods containing sugar, your guinea pigs might not digest the food well, and they may end up with their stomach upsets.

For that reason, guinea pig owners should monitor their pets’ daily diet and keep it balanced.

Overall, avoid feeding iceberg lettuce to your guinea pigs and, instead, offer them some other types of leafy greens that have nutritional value for these little pets.

What Are the Types of Lettuce?

Lettuce is high in phosphorus, which may lead to the development of bladder and kidney stones.

You could consider other types of lettuce rather than iceberg lettuce for your guinea pigs.

Good options are red leaf, green leaf, and romaine lettuce.

Although your guinea pigs eat all types of lettuces, some types are much healthier alternatives to iceberg lettuce.

Let’s take a look at the nutritional value of each type of lettuce.

Iceberg Lettuce vs. Romaine Lettuce

Lettuce is an excellent vegetable for guinea pigs as it contains vitamin C, which is ideal against scurvy, and a great source of antioxidants, and fiber.

As we have discussed, iceberg lettuce has a low nutritional value compared to romaine lettuce.

Therefore, feeding your guinea pigs with romaine lettuce is the healthier choice.

Both romaine and iceberg lettuce contain a high water percentage, but romaine lettuce has more nutritional value.

Let’s quickly look at how the two compare.


Your guinea pig will get the same number of calories from romaine lettuce and iceberg lettuce.

When we consider calories, both types can be the right choice of vegetables for your pet.

Vitamin C

In a cup of chopped lettuce, romaine lettuce has 11.3 mg of vitamin C, while iceberg lettuce has 1.5 mg, which is relatively low compared to that of romaine lettuce.

Vitamin C is vital for scurvy prevention, and it would be wiser to choose romaine lettuce for your guinea pigs.


In 100 grams of chopped lettuce, romaine lettuce has a relatively high concentration of calcium of 16 milligrams compared to a concentration of 10 milligrams in iceberg lettuce.

High calcium levels are not suitable for guinea pigs because they cause bladder and kidney stones.


Romaine lettuce is high in potassium.

It contains 116 mcg of potassium per 100 grams compared to iceberg lettuce, which has 78 mcg potassium in 100 grams serving.

Potassium is essential for keeping a balance of electrolytes and lowering the risk of high blood pressure.

So, in this context, romaine lettuce again is a much better choice for your guinea pigs.


Iceberg lettuce has a low level of fiber.

It only contains 0.7 grams per 100 grams compared to romaine lettuce, which has 1 gram per the same serving size.

Fiber is vital for digestion, but giving too much of it to your guinea pig might cause digestion problems.

Vitamin K

Romaine lettuce has a higher level of vitamin K compared to iceberg lettuce.

In a 100 grams cup of chopped lettuce, romaine lettuce has 48.2 milligrams of vitamin K while iceberg lettuce contains only 16 milligrams.

Vitamin K has a myriad of health benefits.

The most important role of vitamin K is to prevent excessive bleeding through blood coagulation.

Beta Carotene

Beta carotene is an important antioxidant that reduces the risk of cancer and heart diseases in guinea pigs.

Romaine lettuce carries about 1637 micrograms of beta carotene per 100 grams.

This is ten times more compared to iceberg lettuce that contains 164 micrograms of beta carotene, which again makes it an ideal choice of vegetable for your guinea pigs to eat.

Romaine Lettuce vs. Green Leaf Lettuce

Green leaf lettuce provides a lower nutritional value to your guinea pigs compared to romaine lettuce.

Let us look at how different benefits compare for both types of lettuce in the section below;

Dietary Fiber

Green leaf lettuce will provide a slightly higher dietary fiber level to your guinea pig compared to romaine lettuce.

In 100 grams, green leaf type will contain 1.3 grams of fiber, while romaine lettuce will contain 1 gr of fiber.

And, as you know, your guinea pig’s healthy diet should contain more fiber.

Vitamin C

Romaine lettuce will provide a higher vitamin C level to your pet in 100 grams of serving compared to green leaf lettuce.

One serving of 100 grams of romaine lettuce will give 1.0 grams of dietary fiber, while the same serving of green leaf lettuce will provide 1.3 grams, which is slightly higher.

Also, as you already know, your guinea pigs need at least 30 mg/kg of vitamin C every day.


Green leaf lettuce will give a considerably higher calcium level in 100 grams serving compared to romaine lettuce.

However, higher levels of calcium are not a good option for your guinea pigs as they play a role in the development of kidney and bladder stones.

Green leaf lettuce will contain 36 milligrams of calcium, while romaine lettuce will contain 16 milligrams of calcium for the same serving amount.


Feeding your guinea pigs with green leaf lettuce will provide them with a higher potassium level than feeding them with romaine lettuce.

In a 100 gm cup of green leaf lettuce, there will be 194 milligrams of potassium, which is slightly higher than 116 milligrams in romaine lettuce.

Your guinea pigs will get more health benefits from green leaf lettuce regarding potassium, such as controlled blood pressure.


Your guinea pigs will get more calories from eating green leaf lettuce compared to romaine lettuce.

In a cup with 100 grams of lettuce, the green leaf type of lettuce will contain 15 kilocalories, which is slightly higher than in romaine lettuce, which will have 8 kilocalories per the same serving size.

Vitamin K

Green leaf lettuce provides a higher vitamin K level to your guinea pig compared to romaine lettuce.

In a 100 grams serving, green leaf lettuce will have 123.3 micrograms of vitamin K, which is relatively high compared to romaine lettuce that contains only 48.2 micrograms of this vitamin.

Red Leaf Lettuce vs. Romaine Lettuce

Red leaf lettuce is another healthier alternative to iceberg lettuce for your guinea pig.

In addition to romaine lettuce, red leaf lettuce can be a great source of vitamin C, potassium, calories, antioxidants, and calcium.

Both green leaf and romaine lettuce are suitable for guinea pigs, but they also have different nutritional values.

Dietary Fiber

Romaine lettuce will provide your guinea pigs with more dietary fiber compared to red leaf lettuce.

A serving of 100 grams will contain 0.9 grams of fiber for red leaf lettuce and 1 gram for romaine lettuce.

Your guinea pigs will digest other foods better when you feed them with romaine lettuce.

Vitamin C

Feeding your guinea pigs with romaine lettuce will protect them better against scurvy and give them healthier skin because romaine lettuce has a higher level of vitamin C compared to red leaf lettuce.

A serving of 100 grams contains 11.3 milligrams of Vitamin C for romaine lettuce and 3.7 milligrams for red leaf lettuce.

Consequently, romaine lettuce would be a healthier choice for your guinea pig if you are only looking at the amount of vitamin C.


Calcium is good for the strong bones of your guinea pigs and their ever-growing teeth.

However, higher levels of calcium may harm your guinea pigs by causing bladder and kidney stones.

Red leaf lettuce has a higher level of calcium as compared to romaine lettuce.

In 100 grams of lettuce, red leaf type has 33 milligrams of calcium, which is significantly high compared to the romaine type of this vegetable, which only contains 16 milligrams.

Therefore, if you pay attention to calcium levels, again romaine lettuce would be a better choice for your guinea pig’s diet.


Calories are good sources of energy for your guinea pig.

Feeding guinea pigs with red leaf lettuce will give them a higher energy boost compared to romaine lettuce.

In a cup containing 100 grams of lettuce, romaine type will have eight calories, while red leaf type will have 13 calories, which is considerably higher.


Potassium is essential for maintaining electrolyte balance and reducing high blood pressure risks in your guinea pig.

Lettuces are an excellent source of this important electrolyte.

Red leaf lettuce has a higher level of potassium compared to romaine lettuce.

In a standard serving containing 100 grams of lettuce, red leaf type will have 187 milligrams of potassium, while romaine type will have 116 milligrams of the same.

Vitamin K

Vitamin K is essential for normal body functions and blood coagulation of your guinea pig.

Red leaf lettuce has a higher level of vitamin K compared to romaine lettuce.

The lettuce has 140.3 micrograms of vitamin K per 100 grams, while romaine lettuce has 48.2 micrograms, which is considerably lower for your pet.

Beta Carotene

Beta carotene is a good antioxidant for your guinea pig, as it prevents cancer and other diseases.

Lettuce is a useful source of this element.

Red lettuce is very rich in beta-carotene, with 4495 micrograms in 100 grams.

On the other hand, romaine lettuce has a lower beta carotene level with 1637 micrograms per 100 grams of lettuce.

Based on all that we have said, it would be the best choice to combine different types of lettuces, making sure that your guinea pig’s diet remains balanced and of good nutritional value for them.

Can Guinea Pigs Eat Iceberg Lettuce?

Now that we have compared different types of lettuce, you can see that guinea pigs eat all types and that all are somewhat beneficial for their health.

However, don’t feed your guinea pigs iceberg lettuce every day; three to four times a week is acceptable, especially when mixed with other types of fresh vegetables and fruits.

How Frequently Should Guinea Pigs Eat Lettuce?

Fresh vegetables are a daily nutritional requirement for guinea pigs, and lettuces are the right choice for your pet.

However, you might be wondering whether it’s safe to feed your guinea pigs with lettuce every day.

Lettuce contains a lot of water and can cause digestive problems to your pet.

If you feed guinea pigs with too much lettuce, this vegetable may also provoke diarrhea and bloating, which causes pain and suffering to your little friend.

Lettuce contains high calcium levels and that may harm your guinea pigs by putting them at risk of developing kidney or bladder stones.

Romaine and green leaf lettuce also have a high level of calcium.

To be on the safe side, feed your guinea pig three to four times a week with this vegetable but also make sure to mix in other types of vegetables as well.

You can also feed your guinea pig with red leaf lettuce two to three times a week because it has a higher level of calcium when compared to green leaf and romaine lettuce.

Iceberg lettuce has little nutritional value to your pet.

It also contains a lot of water, which can lead to diarrhea and bloating.

Therefore, when compared to other types of lettuces, iceberg lettuce is not the best choice for your guinea pig pet’s diet.

What Are Sources of Vitamin C for Guinea Pigs?

Although lettuce is crunchy and healthy for your guinea pigs, it is high in water content, which is not good for your pet.

There are other healthier sources of vitamin C that your pet may like that also have other health benefits.

Let us look at some of them in the section below.


Your pet will enjoy not only a crunchy carrots treat but this vegetable will also provide your guinea pigs a variety of nutrients.

Carrots are rich in vitamin C, which is useful for preventing scurvy in guinea pigs.

The crunchiness of carrots is also suitable for their ever-growing teeth.

Carrots are also a source of beta carotene, which protects your pet against cancer and chronic diseases such as diabetes.

Your guinea pig will also have smooth digestion due to the fiber they will get from carrots.

Fluid and electrolyte balance is vital for your guinea pigs, as it keeps their blood pressure in check.

Carrots are high in potassium, which translates into a healthy heart for your pet.

How Often Should I Give Carrots to My Guinea Pig?

You should note that carrots are high in sugar, which might cause diabetes and obesity, and therefore you should provide them as a treat.

You should also avoid feeding too many carrots to your pet to prevent diarrhea and bloating.


Parsnips are good alternatives to lettuce.

They are crunchy and, therefore, great for your pets’ teeth.

These vegetables are packed with beta carotene, a powerful antioxidant for your pet’s protection against diabetes and deadly cancer.

Parsnips are also rich in vitamin C for the immune system boost and keep your little friend healthy and free of scurvy.

Your pet will also have a smooth digestive process because they have a considerable amount of fiber.

They are also low in sugar, meaning that your pet will not be at risk of developing diabetes or obesity.

Bell Peppers

Bell peppers come in different colors.

Red, green, and yellow peppers are all safe for your pet.

They are also crunchy, and your pet will love them.

These peppers are rich in vitamin C, which is right for your pet’s immune system and protection against scurvy.

Bell peppers are also an excellent source of fiber for your guinea pig’s digestive health.

Guinea pigs cannot chew hard seeds due to their fragile teeth.

When you feed them fruits and vegetables, seeds might get stuck between their teeth.

Besides, never feed seeds to your guinea pigs!

All types of seeds also present a choking hazard for your pet.

All peppers are low on sugar, and so you don’t have to worry about putting your pet at risk of getting obese or diabetic.

Bell peppers are a great source of antioxidants for your pet which protects them against cancer.


Cucumber can be a good hydrant for your pet on a hot day.

The vegetable is crunchy and has soft seeds that your pet can digest.

Cucumbers are low in fat, high in potassium, vitamin C, and K, suitable for fluid and electrolyte balance, a healthy heart, a healthy immune system, and blood coagulation.

However, also because of high water content, it would be best to feed your pet cucumbers only in moderate quantities to prevent bloating and diarrhea.


A typical guinea pig food, pellets are a good source of vitamin C, as they are usually enriched with this vitamin.

However, not all guinea pig pellets contain vitamin C supplements.

Thus, you should look out for pellets fortified with vitamin C.

Vitamin C degrades fast; if not stored correctly, in a cool and dry place, it may not be of any value to your pet.

You can also choose pellets with a more stable form of vitamin C to fulfill your pet’s daily requirements.

Which Foods to Avoid when Feeding My Guinea Pigs?

  • Spinach, clovers, and parsley are high in oxalate and can put your pet in danger of kidney and bladder stones
  • Fresh fruits such as pineapples, and citrus fruits are high in vitamin C, but are also acidic and can cause your pet to develop sores in the mouth
  • Sugary fruits and vegetables can put your pet at risk of getting diabetes
  • Fruits containing hard seeds such as apples can be dangerous to your pet as they present a choking hazard for your guinea pigs (besides, apple seeds are also poisonous to these small animals).
  • Some leaves, such as tomato leaves, could be harmful to your pet
  • You should also avoid foods like sweet potatoes, onions, garlic, dill, and rhubarb

An important note: never feed your guinea pigs with cooked, baked, fried, or in any way processed foods.

Guinea pigs cannot eat and digest prepared dishes.

Always feed your pets with typical guinea pig food such as timothy hay, guinea pig pellets, and moderate quantities of fresh fruits and vegetables.

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Last update on 2023-05-25 / Affiliate links / Images from Amazon Product Advertising API

Final Thoughts

Can guinea pigs eat iceberg lettuce?

Yes, guinea pigs can eat iceberg lettuce and other types of lettuce as well.

However, make sure to mix lettuce with other fresh fruits and vegetables, and always give them the mixture of these produces in small amounts because all fruits and vegetables contain different nutrients.

Don’t forget that guinea pigs cannot eat processed foods!

A healthy guinea pig’s diet will prevent serious health problems and chronic illnesses.

Make sure that your guinea pigs always have timothy hay, that their water bottle is full, and feed them with fresh fruits and vegetables that are high in vitamin C.


Tim Rhodes
Tim Rhodes

Hi there! My name is Tim Rhodes and I'm a guinea pig enthusiast through thick and thin. My mission is to teach others useful tips and tricks about these cute creatures. When I'm not writing, I enjoy kickboxing and work as an animal trainer.

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Last update on 2023-05-25 / Affiliate links / Images from Amazon Product Advertising API