The Surprising Causes + Symptoms Of Histamine Intolerance: A Functional Medicine Perspective


For healing your gut, bone broth and fermented foods are good food medicine. Beans and spinach are nutrient dense food sources. Smoked meats and fish are great protein options. These foods are all healthful choices for anyone seeking to feel better….aren’t they?

Actually, for some people, these “healthy” foods are anything but, due to a condition many people don’t even know they have called histamine intolerance. (1) If you are histamine intolerant, bone broth, fermented foods, legumes, spinach, and smoked foods can make you feel a whole lot worse, and I have found that for many of my patients, it is an underlying cause of inflammation and chronic symptoms.


Make Your Life a Cleanse



Get FREE access to these + giveaways, recipes, & discount codes (including 50% off code for video courses) in personal emails from Dr. Will Cole


What is histamine intolerance & inflammation?

First, what is histamine? Histamines are chemicals in your body produced in response to allergens. Specifically, your body produces white blood cells called mast cells to release histamines during the inflammatory-immune response to allergens. This is part of a healthy, balanced immune system. Many foods naturally contain histamine, or trigger the release of histamine in the body.

Problems occur however, when there is a dysfunction or deficiency of the enzymes that break down histamine (those enzymes are called histamine N-methyltransferase (HNMT) and diamine oxidase (DAO). Without the enzymes to effectively get rid of excess histamine, you could experience a histamine overflow, which can cause a lot of problems. This is histamine intolerance.What are histamine intolerance symptoms?

What are histamine intolerance symptoms?

Histamine intolerance is basically an allergic reaction without the allergen, sometimes called a “pseudoallergy.” The typical symptoms of histamine intolerance are similar to allergic reactions (like rash, trouble breathing, and a runny nose) but also go beyond your typical sneezing, to include:

  • anxiety
  • brain fog
  • digestive problems
  • eczema
  • fatigue
  • hormone imbalances
  • irritability
  • low blood pressure
  • low sex drive
  • migraines
  • nausea
  • racing heart

If you typically experience any of these symptoms after eating high histamine foods, you may have a histamine intolerance.

Foods to avoid with histamine intolerance:

High-histamine foods

These foods (2) could cause an overload of histamine:

  • Alcohol (including wine)
  • Bone broth
  • Canned food
  • Cheese
  • Chocolate
  • Eggplant
  • Fermented food (kefir, kimchi, yogurt, sauerkraut)
  • Legumes (soybeans, chickpeas, peanuts)
  • Mushrooms
  • Nuts
  • Processed foods
  • Smoked meat products (bacon, salami, salmon, ham)
  • Shellfish
  • Spinach
  • Vinegar

Foods that release histamine

These foods are low in histamines but can trigger the release of histamine and create problems for people with histamine intolerance:

  • Avocados
  • Bananas
  • Citrus fruits (kiwi, lemon, lime, papayas, pineapple, plums)
  • Strawberries
  • Tomatoes

Diamine Oxidase (DAO) enzyme blockers

These foods block the enzyme that controls histamine:

  • Alcohol
  • Energy drinks
  • Teas (black, green, yerba)

Other Sources of Histamine Intolerance

Another source of DAO enzymes can come medications, such as:

  • Antidepressants
  • Antibiotics
  • Narcotics
  • Gatrointestinal medications
  • Antihypertensives
  • Some over-the-counter medications that affect metabolization

What to do if you have histamine intolerance:

If you struggle with the symptoms above or find that these foods give you problems, here’s what I recommend:

  1. Find out for sure

In my functional medicine clinic I run labs to look for a high histamine/DAO ratio. This suggests that you’re eating too many histamine-rich foods for your body, and that you don’t have enough enzymes to break them down.

  1. Get to the root of the problem

Why might people have histamine intolerance in the first place? As a functional medicine practitioner, my goal is to get to the root cause of inflammatory problems like histamine intolerance. A few common possibilities:

Take our inflammation quiz

  1. Eliminate your problem foods.

An elimination diet is the gold standard for uncovering foods that trigger inflammation for you. The elimination diet I cover in my mindbodygreen video course is low-histamine-friendly. I’ll walk you through how to reintroduce foods after a period of elimination time to find out which ones are causing you problems.

  1. Focus on eating fresh foods.

Bacterial growth in foods left unrefrigerated can increase histamine. Eat fresh foods and freeze leftover immediately in single-serve portions.

For a low-histamine diet, (3) focus on these foods:

  • Coconut milk
  • Egg yolk
  • Fresh wild-caught fish
  • Fresh organic meat
  • Fresh vegetables (except eggplants, tomatoes, and spinach)
  • Gluten-free grains (rice, corn)
  • Herbal teas
  • Non-citrus fresh fruits
  • Rice milk
  1. Heal your gut.

Microbiome imbalances can also release histamine and trigger symptoms. Problems like leaky gut syndrome, SIBO, and candida overgrowth could be fueling your histamine intolerance.

Probiotics can help. In one study, (4) two strains of bifidobacterium suppressed histamine release, and in another, (5) Lactobacillus rhamnosus suppressed histamine receptors.

Note: Certain probiotic supplements, especially those containing prebiotics, won’t agree with you if you have bacterial overgrowths.

  1. Eat foods that help your body get rid of excess histamines.

Increase your intake of foods with vitamin B6, vitamin C, and copper.

Vitamin B6: chicken, turkey, and potatoes

Copper: asparagus and liver

Vitamin C: fruits and vegetables (except for those high in histamine)

Black cumin (6) and quercetin are also two natural medicines that have antihistamine properties.

Need help identifying whether or not you have a histamine intolerance? Get a free health evalution! As one of the first functional medicine telehealth clinics in the world, we provide webcam health consultations for people around the globe.


Start Your Health Journey Today



  1. Maintz L, Novak N. Histamine and histamine intolerance. Am J Clin Nutr. 2007 May;85(5):1185-96. doi: 10.1093/ajcn/85.5.1185. PMID: 17490952.
  2. Laura Maintz, Natalija Novak, Histamine and histamine intolerance, The American Journal of Clinical Nutrition, Volume 85, Issue 5, May 2007, Pages 1185–1196,
  3. Janice M. Vickerstaff Joneja & Cabrini Carmona-Silva (2001) Outcome of a Histamine-restricted Diet Based on Chart Audit, Journal of Nutritional & Environmental Medicine, 11:4, 249-262, DOI: 10.1080/13590840120103094
  4. Dev S, Mizuguchi H, Das AK, Matsushita C, Maeyama K, Umehara H, Ohtoshi T, Kojima J, Nishida K, Takahashi K, Fukui H. Suppression of histamine signaling by probiotic Lac-B: a possible mechanism of its anti-allergic effect. J Pharmacol Sci. 2008 Jun;107(2):159-66. doi: 10.1254/jphs.08028fp. Epub 2008 Jun 5. PMID: 18544899.
  5. Oksaharju A, Kankainen M, Kekkonen RA, Lindstedt KA, Kovanen PT, Korpela R, Miettinen M. Probiotic Lactobacillus rhamnosus downregulates FCER1 and HRH4 expression in human mast cells. World J Gastroenterol. 2011 Feb 14;17(6):750-9. doi: 10.3748/wjg.v17.i6.750. PMID: 21390145; PMCID: PMC3042653.
  6. Tariq, Mohammad. “Nigella sativa seeds: folklore treatment in modern day medicine.” Saudi journal of gastroenterology : official journal of the Saudi Gastroenterology Association vol. 14,3 (2008): 105-6. doi:10.4103/1319-3767.41725

View More At Our Store

Purchase personally curated supplements
and Dr. Will Cole’s books!

Shop Dr. Will Cole

The information on this website has not been evaluated by the Food & Drug Administration or any other medical body. We do not aim to diagnose, treat, cure or prevent any illness or disease. Information is shared for educational purposes only. You must consult your doctor before acting on any content on this website, especially if you are pregnant, nursing, taking medication, or have a medical condition.

Our content may include products that have been independently chosen and recommended by Dr. Will Cole and our editors. If you purchase something mentioned in this article, we may earn a small commission.



Evidence-based reviewed article

Dr. Will Cole, IFMCP, DNM, DC, leading functional medicine expert, consults people around the world via webcam and locally in Pittsburgh. He received his doctorate from Southern California University of Health Sciences and post doctorate education and training in functional medicine and clinical nutrition. He specializes in clinically researching underlying factors of chronic disease and customizing a functional medicine approach for thyroid issues, autoimmune conditions, hormonal imbalances, digestive disorders, and brain problems. Dr. Cole was named one of the top 50 functional medicine and integrative doctors in the nation and is the best selling author of Ketotarian and The Inflammation Spectrum.