Can Peanuts Give You Gas or Bloating? Here's Why

Peanuts can give you gas or bloating, and quantity is usually the reason. They are legumes, so they carry the soluble fiber that beans do, and that fiber ferments in the gut. Frying, salt and sweet coatings make it more likely again. Cramping without much gas points at something different, which is worth knowing the difference between.

Below is why the fiber does it, how the preparation changes things, and where an allergy looks different from ordinary gassiness.

Do Peanuts Give You Gas? 

First, let’s discuss the composition of peanuts. Botanically, they are legumes, but nutritionally, they are considered nuts (source: Harvard Health Publishing Harvard Medical School, Reader’s Digest).

Legumes are rich in fiber, which could contribute to gassiness. Peanuts may also contain oil, salt, and sugar, which also cause gas in some people.

Why Would Peanuts Make Me Gassy?

Peanuts are abundant in fiber (source: Harvard T.H. Chan School of Public Health). An ounce of raw Virginia peanuts, for example, contains 2.41 grams of fiber (source: USDA FoodData Central).

Fiber provides bulk, which means you will feel fuller when you eat foods with high fiber content. But this can also cause gas, bloating, and overall digestive discomfort when you eat too much or too quickly (source: MedlinePlus). 

The fiber in peanuts is soluble, like that in other beans and legumes. In the intestines, this soluble fiber softens as it moves, leading to gas formation (source: University of Rochester Medical Center).

Another possible cause of gas is allergy to peanuts. Food allergies occur when Immunoglobulin E (IgE) antibodies are activated after exposure to a protein from food. 

Peanuts account for 90% of all IgE-facilitated food allergies. Peanut allergy is also the most common food allergy in the US (source: Gastroenterology & Hepatology).  

Food allergies can cause abdominal cramps (source: Food Allergy & Intolerance Definitions). If you primarily experience cramping but not gas after you eat peanuts, it could be an allergic reaction.

Peanuts that are fried in oil are more likely to cause gas and bloating, since they're more difficult to digest. (source: University of Rochester Medical Center). Roasted and pan-toasted peanuts are a safer option.

Salt is another culprit. When you eat salty foods, the body experiences water retention, which can make you feel bloated. Processed foods have the highest sodium content. 

Homemade peanut snacks are better than store-bought commercial ones because they contain less salt. This also holds true for sugar-coated peanuts, especially for those that are covered in high fructose corn syrup, which can cause gas, bloating, and abdominal discomfort (source: Cleveland Clinic).

This is because high fructose corn syrup is rich in fructose, as is honey. Fructose malabsorption results in gas and bloating due to fermentation in the large intestines (source: Medical Hypotheses).

Apart from this, high fructose corn syrup is highly processed. It takes time for the human body to process and absorb, which can lead to gas (source: Cleveland Clinic).

If you want to eat peanuts but don't want unpleasant gas and bloating, choose boiled, roasted, or pan-toasted peanuts that are unsalted or not coated with fructose sweeteners.

Gas could also be caused by swallowing air while eating peanuts, regardless of the type. Chew peanuts slowly and thoroughly so your body has an easier time processing them.

Apart from the fried, roasted, or boiled peanuts, other peanut dishes that could cause gas include:

• Peanut brittle, which has a lot of peanuts and a great deal more corn syrup
• Peanut patties, much the same as peanut brittle but made with white sugar instead of corn syrup
• Peanut-based sauces or stews, which carry a lot of peanuts alongside other ingredients that can lead to gas

In terms of peanut varieties, they all contain almost the same amounts of fiber. No one variety will cause more gas and bloating symptoms than the other. 

If you are not allergic to peanuts, they are pretty versatile. You can add them to cakes, muffins, salads, pasta, noodle dishes, and more. Just be mindful of the amount you eat.

Common Questions About Peanuts, Gas And Bloating

How many peanuts is too many?

An ounce of raw Virginia peanuts carries about 2.41 grams of fiber, so a small handful is modest. A bowl in front of the television is where it adds up, because peanuts are easy to keep eating without noticing. The amount that suits you is quite individual, so working down from a smaller serve tells you more than a fixed number.

Are peanuts a nut or a legume, and does it matter for gas?

Botanically they are legumes, though nutritionally they are treated as nuts. It matters here because the fiber in peanuts is soluble, like the fiber in beans, and soluble fiber softens as it moves through the intestines, which is where the gas forms. That is why peanuts behave more like beans than like almonds.

Do roasted peanuts cause less gas than fried?

Generally yes. Peanuts fried in oil are harder to digest and more likely to bring on gas and bloating. Roasted and pan-toasted peanuts are the easier option, and plain ones without a salt or sugar coating are easier again.

Do boiled peanuts cause more gas?

Boiled peanuts keep all their fiber and are often eaten in larger quantities than roasted ones, in a sitting rather than a handful, so the volume tends to be the deciding factor rather than the boiling itself.

Does peanut butter cause the same gas as peanuts?

Peanut butter is concentrated peanuts, so the same fiber is there in a smaller volume, and added oils, salt and sugar in some brands add to it. Reading the label is worth doing, since the plainer versions have fewer of the extras that cause trouble.

Is it gas or a peanut allergy?

They tend to present differently. Ordinary fiber gassiness is wind and bloating that builds gradually. Food allergies can cause abdominal cramps, so if cramping is your main symptom rather than gas, that is a reason to get it checked. Peanut allergy is the most common food allergy in the US and accounts for around 90% of IgE-facilitated food allergies, so it is not a rare thing to rule out.

Does one variety of peanut cause less gas?

No. The varieties carry almost the same amount of fiber as each other, so swapping Virginia for Spanish or runner peanuts is unlikely to change anything. How they are prepared and how many you eat both matter far more than the variety.

Does chewing peanuts properly help?

It helps with part of it. Swallowing air while eating adds to the gas regardless of what the food is, and peanuts are easy to eat quickly. Chewing slowly and thoroughly gives your body less work to do further down.

Can I keep eating peanuts if they make me gassy?

If you are not allergic, most people can, with a smaller serve and plainer preparation. Peanut brittle, peanut patties and peanut-based sauces stack sugar or other gas-producing ingredients on top of the peanuts, so those are the ones to pull back on first.

Where To Go Next

Portion and preparation are the food side of this, and that is Trish Tucker-May's subject, so her page is worth a read if peanuts are one of several foods giving you trouble rather than a one-off.

The fiber pattern behind this shows up across a lot of foods. Spinach, seaweed and boiled eggs each do it for their own reasons, and the gut and digestion index collects them in one place.