Do walnuts have side effects?
William Rodriguez
Published Jan 22, 2026
Other common digestive side effects of tree nuts (including walnuts) include bloating, stomach pain, and diarrhea (2). In other studies involving walnuts, a few participants reported various forms of gastrointestinal distress, including bloating (3). Consuming more than 1 ounce of walnuts may pose this risk.
Is there any side effects of walnuts?
The nut can cause softening of the stools and bloating, as well as weight gain unless other fats are removed from the diet. English walnut may cause allergic reactions in people who are sensitive to it.
What happens if I eat walnuts everyday?
Walnuts are rich in heart-healthy fats and high in antioxidants. What's more, regularly eating walnuts may improve brain health and reduce your risk of heart disease and cancer. These nuts are easily incorporated into your diet, as they can be eaten on their own or added to many different foods.
Why you shouldn't eat a lot of walnuts?
Most of the nuts contain compounds like phytates and tannins, which make it difficult for our stomach to digest them. Nuts also contain different kinds of fat, which can lead to diarrhea.
How many walnuts a day is too much?
Final Thoughts. As nutritious as walnuts are, you don't need lots of them to reap the benefits. Also, too much consumption has been associated with gastrointestinal discomfort, allergic reactions, and high-calorie intake, causing weight gain, Make it a routine to stick to anything between 7-10 walnuts per day.
28 related questions foundWho should not eat walnuts?
A 1-ounce serving of walnuts contains about 14 half-walnut pieces. People who are allergic to nuts should not eat walnuts. If the person develops a rash or hives or difficulty breathing after eating walnuts, medical attention should be sought.
Do walnuts cause gas?
If you're sensitive to walnuts, they can cause stomach pain, gas and bloating. You may also experience nausea or diarrhea. Even if you have a walnut intolerance, you may not have to miss out on their nutritional benefits.
Can walnuts make you feel sick?
Consuming rancid or stale nuts like almonds, walnuts or cashews in small amounts may not immediately make you sick, but it's generally not advisable as it may hamper digestion or have other harmful effects on your body in the long term.
Can eating too many nuts hurt you?
Though they have been proven as effective in curing spasms and pain, if you consume them in excess, it can lead to toxicity in your body. This is because they contain hydrocyanic acid, an over-consumption of which can lead to breathing problem, nervous breakdown, choking and even death!
Are walnuts poisonous?
Black walnut trees produce a toxic chemical called juglone, a chemical so strong it can damage and even kill off vegetative growth around these trees and is blamed for issues in horses who are exposed to black walnut shavings.
Which is better almonds or walnuts?
While their fat, carb, and protein contents vary slightly, almonds pack more minerals. However, walnuts take the lead when it comes to omega-3 fatty acids, specifically alpha-linolenic acid (ALA). In fact, they're the nut with the highest ALA content ( 1 , 2 , 3 ).
Do walnuts help you sleep?
Regardless, if you struggle with sleep, eating some walnuts before bed may help. About a handful of walnuts is an adequate portion. Walnuts have a few properties that may promote better sleep. For instance, they're a great source of melatonin and healthy fats.
What happens when you eat 5 walnuts everyday?
Helps Reduce Blood Pressure: Walnuts contain polyunsaturated fats that help in reducing the blood pressure level. Having about 5 walnuts every day helps.
Do walnuts interfere with any medications?
Soybean flour, walnuts
Thyroid drugs such as levothyroxine (Levothroid, Levoxyl, Synthroid). These high-fiber foods can prevent your body from absorbing the medications. If you eat a high-fiber diet, try taking your medications later in the evening.
Do walnuts interfere with medications?
Walnuts are high in dietary fiber and on average contain 31% of your daily value of fiber per cup – this is great for your digestion and cholesterol, but could potentially alter the absorption of certain medications.
Do walnuts cause high blood pressure?
Walnuts may help lower blood pressure for those at risk of heart disease. Summary: When combined with a diet low in saturated fats, eating walnuts may help lower blood pressure in people at risk for cardiovascular disease, according to a new study.
Do nuts cause bowel movements?
Nuts are a filling food that is also packed with fiber to help ease constipation. Almonds, pecans, and walnuts have more fiber than other nuts.
Can nuts cause colon problems?
In the past, people with small pouches (diverticula) in the lining of the colon were told to avoid nuts, seeds and popcorn. It was thought that these foods could lodge in diverticula and cause inflammation (diverticulitis). But there's no evidence that these foods cause diverticulitis.
Is half a cup of nuts a day too much?
The American Heart Association recommends eating four 1.5-ounce (about a handful) servings of unsalted, unoiled nuts per week, and the U.S. Food and Drug Administration says that eating 1.5 ounces of nuts per day may reduce the risk of heart disease.
Are walnuts hard on the digestive system?
Walnuts boast of numerous health benefits and now you have another reason to add them to your daily diet. According to the researchers at Louisiana State University, consumption of walnuts may be beneficial for digestive health by increasing the amount of good probiotic-type bacteria in the gut.
Are walnuts good for your colon?
Tree nuts like almonds, walnuts, cashews, hazelnuts, and pistachios are best known for their beneficial fat and protein content. But they also help keep your colon healthy and reduce the risk of colon cancer.
Can walnuts cause indigestion?
Nuts, including cashews, are high in fats, which slow down the emptying stomach. Although not a major cause, nuts, such as cashews, can trigger heartburn in some individuals. Nuts, including cashews, are high in fats, which slow down the emptying stomach.
Why do walnuts hurt my stomach?
It's a common side effect, thanks to compounds in nuts called phytates and tannins, which make them difficult to digest. And eating too much fat, which is found abundantly in nuts, in a short period of time can lead to diarrhea, says Alan R.
Do walnuts cause constipation?
No, walnuts do not cause constipation in normal situations as it is a great source of gut-friendly probiotics and also contains fiber, magnesium, and polyunsaturated acid. These nutrients make walnuts among the best natural laxatives that aid in smooth bowel movements.
Can walnuts trigger IBS?
A serving size of 30g (or 10 walnut halves) is low in FODMAPs and should be more tolerable for the vast majority of those with IBS. Larger servings over 135g (35 walnut halves) contain moderate amounts of Oligos-fructans and should be limited.