Walnuts are nuts belonging to the tree of Genus Juglans. In terms of botany, walnuts are not nuts but are actually considered as the seed of the drupe. They are available in many varieties and are processed and consumed in many ways. Walnuts are an excellent source of numbers of nutrients like vitamins, minerals, antioxidants, Omega fatty acids, and other compounds, and the presence of these nutrients make walnuts very beneficial us. Although there are many health and beauty benefits of walnuts, at the same time there are also side effects of overeating walnuts, and in this article, we will know about these side effects and why we should avoid overeating walnuts.

Side Effects Of Overeating Walnuts

Side Effects Of Overeating Walnuts

(1) Promotes Weight Gain

Walnuts are high in calories and eating one ounce of walnuts provides as much as 190 calories of energy, 18 grams of fats, and 4 grams of carbohydrates. Because of the high calorific value of walnuts, it is advised not to eat too many walnuts. The weight gains risk associated with walnuts triggers when a person eats too many walnuts on a regular basis. Otherwise, walnuts are good for weight management.

As per the research conducted by Sabat’e et al. (2005) at the Loma Linda University, California, the USA, it was found that individuals who ate about 35 grams of walnuts per day for a period of one year, didn’t show any significant weight gain. This means that one can enjoy walnuts without worrying about weight gain as long as he is eating them in moderation.

However, if you are overweight and are already taking enough calories in your diet then it is better to be more careful. The high amount of fat present in walnuts also plays a significant role in weight gain.

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(2) May Cause Allergic Reactions

Although walnuts provide a lot of health and beauty benefits they overeating walnuts can cause allergic reactions in some people. The severity of these allergies varies from person to person, and some may experience minor allergic reactions, and while for others, these allergic reactions could be very serious.

Because of this risk associated with walnuts, it is better not to eat them too much and if you experience any allergic reaction then it is better to stop consuming walnuts and consult your doctor.

Some of the common symptoms of walnut allergy are itching in the tongue and mouth, anaphylactic shock, hives, swelling of the throat, asthma risk, etc (source ).

(3) Can Cause Rashes And Swelling

Eating walnuts is good for our skin and they provide a lot of benefits like providing relief from wrinkles and fine lines, reducing the risk of premature aging, and keep our skin moisturized.

In spite of having so many beauty benefits associated with walnuts, it is better to eat walnuts in moderation as excessive consumption of walnuts can cause swelling and skin rashes all over the body.

Some individuals who are sensitive to other forms of nuts like almonds, cashew nuts, etc. are at a higher risk of suffering from skin reactions caused by overeating walnuts.

(4) Can Cause & Worsen Diarrhea

Walnuts are an excellent source of dietary fibers and the presence of these dietary fibers make walnuts very beneficial for keeping our digestive system healthy and providing relief from constipation and other digestive problems.

However, the same dietary fibers can give rise to diarrhea and other stomach problem when it is consumed in excessive quantity. Because of this risk associated with dietary fibers, it is better not to overeat walnuts.

In addition to this, walnuts are at high risk of carrying allergens and these allergens can worsen the condition of diarrhea and may even cause other digestive problems. So, if you are suffering from diarrhea then it is better to forget about eating diarrhea and consult your doctor first. In healthy circumstances too, it is better to avoid overeating walnuts to avoid the risk of diarrhea.

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(5) Can Cause Nausea

Walnuts are high in allergen and these allergens are both good and bad for us. They are good in the sense that the antibodies present in allergens stimulate the white blood cells to produce histamine in our body.

Histamine is an organic compound that functions as a part of the immune system and dilates blood vessels, regulates the physiological function of guts, and acts as a neurotransmitter.

They are bad because the high level of allergens/histamine can worsen the condition of diarrhea and give rise to allergic reactions like nausea, stomach pain, and diarrhea. It is important to note that these side effects trigger when we eat too many walnuts and it is safe to eat walnuts in small quantities .

(6) Not Safe For Pregnant And Nursing Women

Because of the risk of allergic reactions associated with walnuts( due to the presence of allergens), they are not considered safe for pregnant and breastfeeding women and they should stay away from walnuts during their pregnancy and nursing period.

(7) Can Cause Lip Cancer

The antioxidants present in walnuts make them very beneficial for reducing the risk of development of several types of cancer because of their ability to fight with free radicals of our body and stabilizing them. Walnuts are also good for our skin and this is why they are used in many beauty products.

However, walnuts are not so suitable for our lips, and applying walnuts on the skin on a regular basis can cause lip cancer because of the chemical compound “Juglone”  present in it. This rare side effect of walnuts occurs after prolonged use.

(8) Not Suitable For Asthmatic Patients

Because of the high risk of allergic reactions associated with walnuts, they are not considered safe for people suffering from asthma as it can trigger asthma attacks.  Asthma is a  very common and major respiratory disease that affects millions of people all over the world.

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As per a 2011 report published by WHO, 235 million people were suffering from asthma and this number is increasing at a very rapid rate. Asthma can’t be cured but can only be controlled by proper diagnosis, monitoring, precaution, and treatment. Because of this reason, it becomes even more important for asthmatic patients to stay away from eating walnuts.

(9) Can Cause Swelling Of Throat & Tongue

In spite of having so many health and beauty benefits associated with walnuts, they are not suitable for individuals who are sensitive to walnuts and they should stay away from eating walnuts at any cost.

This is because sometimes, these allergic reactions could be very severe and they may experience swelling of the throat, tongue, tongue, and even the lungs. This condition may get worse and make breathing difficult Proper medical intervention at the right time is very much needed for dealing with such a situation.

The best way to avoid such a scenario is not to take the risk and avoid eating walnuts if you are sensitive to walnuts, and even if you are not sensitive to walnuts, it is better not to eat them too much.

(10) Walnut Leaves May Cause Acne And Ulcers

For some individuals, walnuts are a blessing and for some individuals, they are like a curse. It is a blessing for those who are not allergic to it and they can enjoy all the health and beauty benefits associated with walnuts, but those who are allergic to walnuts should stay away from eating walnuts to avoid various allergic reactions like diarrhea risk, risk of an asthma attack, nausea, swelling of throat and tongue, etc.

Not just walnuts, but even walnuts leaves can trigger allergic reactions. Topical application of walnuts leaves on the skin can cause acne, eczema, ulcers, and other skin infections, and because of this reason, it is better to do a little patch test if you are going to use something with walnut leaves in it.


The information contained in the post is for general purposes only and shouldn’t be considered as medical advice or as an alternative to medical advice. Although I’ve tried my best to keep the information contained in this post as accurate and updated as possible, I make no guarantee of the accurateness of the same.

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