Histamine
Blog post description.
6/6/20261 min read
Histamine is a chemical messenger naturally produced by the body. It plays several important roles:
Allergic reactions: When you're exposed to an allergen (such as pollen or pet dander), histamine is released from immune cells, causing symptoms like itching, sneezing, runny nose, hives, and swelling.
Stomach acid production: Histamine helps stimulate acid secretion in the stomach to aid digestion.
Brain function: It acts as a neurotransmitter involved in wakefulness, attention, and other neurological processes.
Inflammation: Histamine increases blood flow and makes blood vessels more permeable, helping immune cells reach injured or infected tissues.
Histamine exerts its effects through several receptor types (H1, H2, H3, and H4):
H1 receptors: Mainly involved in allergy symptoms.
H2 receptors: Stimulate stomach acid secretion.
H3 receptors: Regulate neurotransmitter release in the brain.
H4 receptors: Participate in immune system regulation.
Common medications that block histamine include:
Antihistamines such as Cetirizine and Loratadine for allergies.
H2 blockers such as Famotidine for acid reflux and ulcers.
If you'd like, I can also explain histamine intolerance, how antihistamines work, or the biochemistry of histamine synthesis and metabolism.
1. Foods naturally high in histamine (most important)
These are often aged, fermented, or processed foods:
Aged cheeses (cheddar, parmesan)
Fermented foods (kimchi, sauerkraut, yogurt, soy sauce)
Cured or processed meats (salami, bacon, ham)
Alcohol (especially wine, beer, champagne)
Vinegar and vinegar-based foods (pickles, sauces)
Canned or smoked fish (tuna, sardines, mackerel)
Leftovers (histamine increases as food sits in the fridge)
2. Foods that may trigger histamine release (histamine liberators)
These don’t always contain much histamine but can prompt your body to release it:
Tomatoes
Strawberries
Citrus fruits (oranges, lemons)
Chocolate
Nuts (especially walnuts, cashews)
Shellfish
Egg whites (in some people)
3. Foods that may reduce histamine breakdown
Some foods or substances can interfere with the enzyme DAO (diamine oxidase), which breaks down histamine:
Alcohol (strong inhibitor)
Energy drinks / certain additives
Some medications (varies individually)
4. Fresh foods are usually safest
Lower-histamine options generally include:
Freshly cooked meat and fish
Rice, oats, quinoa
Most fresh vegetables (except a few triggers like tomatoes for some people)
Pears, apples, blueberries
Olive oil, herbs
The above content is generated by AI.