Histamine intolerance is one of the most common things women in New Zealand and Australia ask me about, and one of the most confusing. Hives after a glass of wine, headaches after leftovers, a flushed face after tomatoes, a blocked nose every evening. I am Kirstie Vesseur, a Registered Clinical Nutritionist in Te Awamutu, and I work online with women across NZ and Australia. This guide covers the symptoms, what testing is actually available here, and a simple low-histamine starting plan.
What histamine intolerance is
Histamine is a natural chemical your body makes. It is also found in many foods, especially aged, fermented or leftover foods. Normally an enzyme in your gut called DAO (diamine oxidase) breaks down histamine from food. If DAO is low, or your histamine load is too high, histamine builds up and causes symptoms.
It is not an allergy. Allergy tests will usually come back normal. It is a dose problem, like a bucket overflowing.
Common symptoms
Flushing, itching or hives, especially after food or alcohol
Headaches or migraines
Blocked or runny nose, sneezing
Bloating, diarrhoea or reflux
Racing heart, anxiety or poor sleep
Painful or heavy periods, and symptoms worse before your period or around ovulation
That last point matters. Oestrogen and histamine appear to interact, which may explain why so many women notice histamine symptoms in their 30s and 40s, or in perimenopause. I explain this more in my perimenopause guide for NZ women.
Testing for histamine intolerance in NZ and Australia
I want to be straight with you here, because you can waste a lot of money on testing.
There is no single reliable test. Blood DAO tests are available privately, but research results are mixed and a normal result does not rule it out.
IgG food intolerance tests are not reliable. ASCIA, the Australasian allergy body, lists IgG testing as unproven and inaccurate. Please skip them.
The best test is a short elimination and reintroduction. ASCIA describes a supervised elimination diet as the only reliable way to work out whether food is driving symptoms.
Rule out other causes first
Ask your GP to check for conditions that look like histamine intolerance:
Coeliac disease (tTG blood test, while you are still eating gluten)
True food allergy (skin prick or specific IgE testing)
Iron deficiency (ferritin) and thyroid problems (TSH)
IBS, SIBO or inflammatory bowel disease if gut symptoms lead
Mast cell disorders if you have severe or frequent reactions
In Australia, ask whether these are Medicare-rebated or need a specialist referral.
Red flags: call 111 (NZ) or 000 (AU)
Swelling of the lips, tongue or throat
Trouble breathing, wheezing or a hoarse voice
Feeling faint, pale or floppy after eating
These are signs of anaphylaxis, which is a true allergy, not histamine intolerance. Use your adrenaline autoinjector if you have one and call for help. See your GP soon for unexplained weight loss, blood in your stool or ongoing diarrhoea.
A low-histamine starting plan (2 to 4 weeks)
This is a short trial, not a forever diet. Long restrictive diets can leave you low in nutrients. Follow it for 2 to 4 weeks, keep a symptom diary, then reintroduce.
Golden rule: fresh is best
Cook meat and fish fresh and eat it the same day, or freeze portions straight away.
Leftovers: refrigerate within 1 hour and eat within 24 hours, or freeze.
Buy fish as fresh as possible. Fish like kahawai, tuna and kingfish build histamine fast if not chilled.
Foods to reduce for now
Wine, beer, cider and kombucha
Aged cheese: parmesan, aged cheddar, blue cheese
Fermented foods: sauerkraut, kimchi, soy sauce, miso, vinegar
Cured and processed meats: salami, ham, bacon, sausages
Smoked salmon, canned tuna, anchovies
Tomatoes, spinach, eggplant and avocado
Citrus, strawberries, pineapple and banana
Chocolate and cocoa
Foods to enjoy
Protein: fresh chicken, NZ lamb, beef, fresh fish, eggs. Aim for 25 to 30 g per meal (about 100 g cooked chicken or 4 eggs).
Carbs: rice, oats, quinoa, kūmara, potato, buckwheat.
Vegetables: courgette, broccoli, carrot, pumpkin, cauliflower, lettuce, cucumber, capsicum. Aim for 5 handfuls a day.
Fruit: apples, pears, blueberries, feijoas, mango. Two serves a day.
Dairy: fresh milk, cream cheese, ricotta, mozzarella.
Fats: olive oil, butter, pumpkin and chia seeds.
Herbs: fresh basil, parsley, thyme, ginger and turmeric.
Sample day
Breakfast: oats cooked in milk with pear, chia seeds and 2 boiled eggs on the side
Lunch: freshly cooked chicken with rice, cucumber and grated carrot, dressed with olive oil
Snack: apple with a tablespoon of pumpkin seeds
Dinner: fresh lamb steak, roast kūmara and steamed broccoli
Supplements that may help
These support the plan. They do not replace it. Check with your GP or pharmacist first, especially if you take medication.
DAO enzyme: 1 capsule (around 10,000 to 20,000 HDU) 15 minutes before your main meals. Helpful for meals out. Most DAO supplements are pork-derived, so check if you avoid pork. Benefit in trials has been modest.
Quercetin: Pure Encapsulations Quercetin, 250 to 500 mg twice daily with food. Evidence in people is limited. Caution if you take blood thinners, antibiotics or cyclosporin. Avoid in pregnancy.
Vitamin C: Thorne Buffered C, 500 mg twice daily. Reduce if it loosens stools. Avoid high doses with a history of kidney stones.
Vitamin B6 (as P5P): up to 10 mg daily. It may support histamine breakdown, though evidence is limited. Stop and see your GP if you notice tingling, burning or numbness, and check your multivitamin and magnesium for added B6.
Magnesium glycinate: Pure Encapsulations Magnesium (glycinate), 300 mg at night, for calm and sleep.
Some medicines can lower DAO. Do not stop any prescribed medicine. Ask your GP or pharmacist if yours could be a factor.
Reintroducing foods
After 2 to 4 weeks, add back one food every 3 days, starting with a small serve. Note any symptoms. Most women find they tolerate far more than they feared. The goal is to find your personal threshold, not to avoid histamine forever.
Want the full step-by-step plan?
The Histamine Blueprint (NZ$197) gives you the complete low-histamine protocol: full food lists, a 4-week meal plan, a reintroduction schedule and a supplement guide written for NZ and Australian kitchens.
If your gut is part of the story, and it often is, The Gut and Histamine Bundle (NZ$297) adds my gut healing protocol so you fix the cause, not only the symptoms.
Not sure where to start? Book a free 30 minute assessment and we will map out your plan.
Sources
This article is general education only. It is not medical advice and does not replace care from your GP, allergist or specialist. Talk to your doctor or pharmacist before starting supplements or making big diet changes.
