7 Side Effects of Eating Too Many Almonds

Eating too much of this nutty tidbit can be more harmful than you think.

Medically reviewed by Reda Elmardi, RDN Reda Elmardi Reda ElmardiRDN facebook_iconinsta_icon
Written by , BSc, Professional Certificate in Food, Nutrition and Health Ravi Teja Tadimalla BSc, Professional Certificate in Food, Nutrition and Health linkedin_icon Experience: 8 years
Edited by , BA (Literature & Psychology), PG Diploma Arshiya Syeda BA (Literature & Psychology), PG Diploma linkedin_icon Experience: 7 years
Fact-checked by , BEd, MSc (Microbiology), Diploma In Nutrition Aparna Mallampalli BEd, MSc (Microbiology), Diploma In Nutrition linkedin_icon Experience: 5 years
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A few side effects of almonds may make you wonder if you should consume them. Almonds are crunchy, nourishing, and delicious. They have many culinary uses and make a great snack. These nuts provide numerous health benefits and are a great source of nutrients.

However, studies found that excessive consumption of almonds can cause adverse effects. This article examines the side effects of almonds and any potential drug interactions. Read on.

protip_icon Know The Flip Side: Almonds

Short-Term Effects
Constipation, weight gain, allergies, digestive issues like stomach ache, and diarrhea.

Long-Term Effects
May aggravate toxins in the body, cause kidney stones, or lead to a vitamin E overdose.

Drug Interactions
May interact with medication for blood pressure.

When To See A Doctor
If you develop allergic reactions such as skin rashes, or shortness of breath, seek medical help immediately.

Types Of Almonds

Almonds come in several distinct types, each with its own unique characteristics. The two primary categories of almonds are sweet and bitter.

Sweet almond is the more common variety of the two. It is widely consumed and recognized for its mild, delightful flavor. It is a key player in the culinary world and provides a plethora of health benefits owing to its impressive nutritional profile (1).

In contrast, bitter almond contains amygdalin, a compound that can release toxic cyanide when ingested (2). Due to this inherent danger, bitter almond is not suitable for consumption and is typically used in the production of almond extracts, flavorings, or cosmetics.

Nevertheless, excessive consumption of either type can result in an array of adverse reactions. Learn more about them below.

What Are The Side Effects Of Almonds?

1. May Cause Constipation

Woman experience gastrointestinal distress as a side effect of having almonds
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There is a common query that do almonds make you poop? The answer is not as simple as you’d like to think. Almonds are rich in fiber and potassium that can improve bowel movements. An ounce of almonds (about 23 kernels) contains 3.5 grams of fiber (3). Though this is good, the excess intake of fiber can lead to constipation and a host of other gastrointestinal issues if not combined with enough water intake (4).

Other gastrointestinal symptoms caused by excess intake of almonds (and their fiber) are bloating, gas, abdominal pain, and diarrhea (5).

2. Decrease Nutrient Absorption

The excess fiber can also bind with other minerals (like calcium, magnesium, zinc, and iron) and interfere with their absorption in the bloodstream causing nutrient deficiencies (5). Consume almonds as a single snack or in between meals to get full benefits of the nuts.

The recommended daily fiber intake is about 30 grams for most people (6). Anything beyond that can cause issues.

3. May Cause Weight Gain

Woman experiencing weight gain due to excess consumption of almonds
Image: Shutterstock

An ounce of almonds (23 kernels) contains about 164 calories (3). Though this is not a problem by itself, if you consume almonds in excess (more than 20), on top of your regular diet, you can pile on pounds.

This is especially true if you do not indulge in regular physical exercise.

It is highly unlikely almonds by themselves can cause weight gain. Consuming them in excess as well as following a poor lifestyle makes one prone to weight gain.

4. Can Lead To Allergies

After walnuts and cashews, almonds cause most tree nut allergies in the US (7).

Amandin, a protein in almonds, has been identified as an allergen (7).

Though almonds may be good for dental problems but overconsumption can cause oral allergy syndrome in certain individuals. The symptoms include itchy mouth, scratchy throat, and swelling of the tongue, mouth, and lips (8).

Almonds also can cause a much severe allergic reaction called anaphylaxis (9). This condition is characterized by shortness of breath, hives, nausea or vomiting, confusion, impaired voice, low blood pressure, headache, and dizziness.

5. May Lead To Vitamin E Overdose

Almonds are rich in vitamin E. But consuming them in excess may lead to vitamin E overdose.

Though overdosing on vitamin E by merely eating almonds is highly unlikely (one cannot just eat so many almonds!), it is essential we are aware of the repercussions.

If you are already consuming other foods rich in vitamin E (like fortified cereals and whole grains), excess of almonds can cause problems.

Excess intake of vitamin E can interrupt blood coagulation and lead to hemorrhage (10). However, these effects are more prominent in individuals taking excess of vitamin E supplements.

6. May Cause Kidney Stones

Almonds are rich in intestinal soluble oxalates, which are compounds that may contribute to renal failure and kidney stones. Reports suggest that oxalates from almonds have a high bioavailability (11).

Evan Levine, M.D., shared his negative experience with almonds in a personal blog, connecting his almond consumption to a kidney stone issue. He stated, “I came down with a calcium oxalate stone, and the only risk I could find was that I ate a lot of almonds. Almonds contain the most important ingredient needed to form the most common type of kidney stone — oxalate (i).”

A hundred grams of roasted almonds contains 469 milligrams of oxalate (12).

7. Increase Toxins In The Body

Almonds, especially bitter versions, can cause cyanide poisoning. The HCN level is 40 times higher in bitter almonds as compared to sweet almonds (13).

After enzymatic hydrolysis, hydrocyanic acid (HCN) may lead to respiratory problems, nervous breakdown, choking, and even death. Hence, they are a strict dietary prohibition for pregnant and lactating women.

8. Digestive Issues

Many people who consume almonds experience digestive issues, such as stomach aches and diarrhea. These symptoms may occur immediately after consumption or several hours later. If you experience these symptoms, try taking probiotics or drinking plenty of water. You may also want to avoid eating nuts for a few days before trying again.

9. Heartburn

Heartburn occurs when acid refluxes back up into the esophagus. People who experience heartburn often feel burning sensations in their chest. To prevent heartburn, eat smaller portions of food at once and chew slowly. Avoid foods that cause indigestion, such as spicy foods, alcohol, caffeine, and fatty foods.

10. Bloating

Bloat is caused by gas buildup in the intestines. Gas builds up in the body due to poor digestion. Eating small meals throughout the day helps keep bloating under control. Try avoiding foods that cause gas, such as beans, broccoli, cauliflower, cabbage, Brussels sprouts, onions, garlic, and dairy products.

11. Nausea

Woman feeling nauseaous due to excess consumption of almonds
Image: Shutterstock

Nausea is a feeling of sickness or discomfort in the stomach. It can be triggered by certain foods, medications, or changes in weather. Foods that trigger nausea include citrus fruits, tomatoes, cucumbers, peppers, chocolate, and coffee. Medications that can cause nausea include chemotherapy drugs and birth control pills. Changes in weather can make someone feel nauseous too (such as traveling in the hot summer in a car or plane).

protip_icon Fun Fact
Almonds have been mentioned in many texts dating back to 1400 BC, including the Bible and Greek mythological stories.

Almonds are incredibly healthy, of course. But as is the case with any food, moderation is key.

How Many Almonds Can You Eat In A Day?

Woman thinking how many almonds she can have in a day
Image: Shutterstock

Jesse Feder, Clinical Dietitian at the Memorial Regional Hospital, says, “It is recommended to have about 20-23 almonds a day for the average adult. Having more than this is considered too much. This is because almonds are high in calories and fat. When eaten in moderation, they can provide your body with healthy fats. However, if over-consumed, they can cause weight gain and other negative health effects.”

One ounce of almonds contains 23 kernels (3). There is no scientific data on how many almonds you can eat in a day to avoid the side effects. But anecdotal evidence suggests limiting your intake to 10 to 15 almonds a day. It is always better to soak almonds overnight to make fiber more bioavailable.

protip_icon Fun Fact
In 100 AD, almonds were thrown over the heads of Roman newlyweds as a fertility charm.

Infographic: 5 Major Side Effects Of Excessive Almond Consumption

Almonds are a great crunchy snack. However, munching on one too many may have dire consequences. While the article has listed down all of the possible side effects one may face, we have compiled some of the serious ones that warrant immediate attention.

Check out the infographic below to learn more about the adverse effects of having too many almonds at a time.

best exercises to reduce fupa (infographic)

Illustration: StyleCraze Design Team

Almonds are loaded with many beneficial nutrients that can promote overall health. However, one must also note the side effects of almond consumption. Almonds may cause constipation, weight gain, skin irritation, and vitamin E overdose. Overconsumption may also cause kidney stones, and bitter almonds may increase toxin levels in the body. These nuts may also aggravate tree nut allergies, and their fiber may interfere with nutrient absorption. Hence, practice caution and consume almonds in moderation.

Frequently Asked Questions

Who should not eat almonds?

Jesse Feder says, “People who should not eat almonds include those who have fat malabsorption issues, those at risk for kidney stones, people who have trouble swallowing, and those looking to cut back on fat intake. Almonds contain oxalates, which can increase your risk of developing kidney stones if you are already at risk for them.”

Do almonds increase heart rate?

“Almonds will not typically increase your heart rate. The healthy fats in almonds are heart-healthy and can even help reduce your blood pressure and heart rate. However, if you begin to overconsume almonds, you may begin to gain weight, and this can put added stress on your heart leading to an increased heart rate,” says Feder.

Do almonds cause inflammation?

Feder explains, “When eaten in moderation, almonds do not cause inflammation in the body. In fact, they can help fight against inflammation due to the healthy fats contained in them, as well as the antioxidant vitamin E. This vitamin has been shown to help fight off inflammation in the body. However, if you begin to overconsume almonds, you may experience inflammation due to the high fat intake and weight gain.” In addition, if you have a nut allergy, almonds may cause inflammation, rashes, nausea, etc.

What can you substitute almonds with?

You can replace almonds in your diet with hazelnuts, cashews, and pistachios (all unsalted). But remember, moderation is key. Do not consume more than a handful of nuts a day.

Are raw almonds safe to eat?

A: Yes, you can eat raw almonds. Keep in mind to wash them first and then dry them properly before storing.

Can you eat almonds on an empty stomach?

Yes, you can eat almonds on an empty stomach. Doing so helps accelerate your metabolism.

Can you drink the water of soaked almonds?

There is limited information on this. Hence, we recommend you not to drink the water of soaked almonds without consulting your doctor.

How do you know if almonds have gone bad?

If you open the container of almonds and sense a sour, chemical-like smell, your almonds have gone bad. These rancid almonds can taste bitter and must be thrown away.

You can try almonds that are beyond the best-buy date. Almonds can last up to a year if stored properly.

How long should almonds be soaked?

You can soak almonds overnight. With proper storage, soaked almonds can remain fresh for up to a week.

Do almonds increase bowel movements?

The fiber in almonds may increase bowel movements (14). This helps treat constipation. However, if not combined with enough water, almonds may cause gastrointestinal issues.

Do almonds cause arthritis?

No, almonds do not cause arthritis.

Are almonds good for joint pain?

Since almonds are rich in vitamin E, they may have anti-inflammatory effects that may help heal joint pain (3), (15).

Key Takeaways

  • Eating too many almonds might cause diarrhea, bloating, and an upset stomach.
  • It could be tough to digest almonds.
  • Almonds’ high oxalate content has been associated with kidney stones in certain people.
  • Excessive intake of vitamin E can disrupt the body’s ability to control blood clotting and cause hemorrhage.

References

Articles on StyleCraze are backed by verified information from peer-reviewed and academic research papers, reputed organizations, research institutions, and medical associations to ensure accuracy and relevance. Read our editorial policy to learn more.

  1. Almonds (Prunus Dulcis Mill. D. A. Webb): A Source of Nutrients and Health-Promoting Compounds, Nutrients , US National Library of Medicine, National Institutes of Health.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7146189/
  2. Potential Toxic Levels of Cyanide in Almonds (Prunus amygdalus), Apricot Kernels (Prunus armeniaca), and Almond Syrup, ISRN Toxicology , US National Library of Medicine, National Institutes of Health.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793392/
  3. Nuts, almonds, United States Department of Agriculture, National Nutrient Database.
    https://fdc.nal.usda.gov/fdc-app.html#/food-details/170567/nutrients
  4. Stopping or reducing dietary fiber intake reduces constipation and its associated symptoms, World Journal of Gastroenterology, US National Library of Medicine, National Institutes of Health.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3435786/
  5. Fiber-How, Duke University.
    https://students.duke.edu/
  6. Fiber,Harvard T.H. Chan School of Public Health.
    https://www.hsph.harvard.edu/nutritionsource/carbohydrates/fiber/
  7. Almond Allergy: An Overview on Prevalence, Thresholds, Regulations and Allergen Detection, Nutrients, US National Library of Medicine, National Institutes of Health.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6266711/
  8. Oral allergy syndrome, American College of Allergy, Asthma, & Immunology.
    https://acaai.org/allergies/types/food-allergies/types-food-allergy/oral-allergy-syndrome
  9. Manifestations of Food Allergy: Evaluation and Management, American Family Physician.
    https://www.aafp.org/pubs/afp/issues/1999/0115/p415.html
  10. Vitamin E, Office of Dietary Supplements, National Institutes of Health.
    https://ods.od.nih.gov/factsheets/VitaminE-HealthProfessional/#h7
  11. Renal Failure due to Excessive Intake of Almonds in the Absence of Oxalobacter formigenes, The American Journal of Medicine.
    https://www.amjmed.com/article/S0002-9343(15)00682-8/pdf
  12. Nutritional management of kidney stones, Clinical Nutrition Research.
    https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.892.131&rep=rep1&type=pdf
  13. Potential Toxic Levels of Cyanide in Almonds (Prunus amygdalus), Apricot Kernels (Prunus armeniaca), and Almond Syrup, ISRN Toxicology, US National Library of Medicine, National Institutes of Health.
    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3793392/pdf/ISRN.TOXICOLOGY2013-610648.pdf
  14. Safety and Efficacy of Using Nuts to Improve Bowel Health in Hemodialysis Patients, Journal of Renal Nutrition, US National Library of Medicine, National Institutes of Health.
    https://pubmed.ncbi.nlm.nih.gov/32001127/
  15. The anti-inflammatory role of vitamin E in prevention of osteoporosis, Advances in Pharmacological Sciences, US National Library of Medicine, National Institutes of Health.
    https://pubmed.ncbi.nlm.nih.gov/22162676/
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Reda Elmardi
Reda Elmardi is a registered dietician, certified nutritionist, and certified strength and conditioning specialist trainer. He has more than 10 years of experience and has been an NSCA Certified Strength and Conditioning Specialist Trainer since 2015.

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