Diet for Allergy Sufferers: What Science Supports and What to Skip

No food or diet has been shown to cure hay fever or other allergies. A balanced diet still matters for your overall health, and a few supplements have some early evidence, but megadoses and “allergy-fighting” diets can do more harm than good. If you have a food allergy, the most important diet rule is different: avoid the food that causes your reactions while making sure you still get the nutrients you need.

This guide covers both: what the research says about nutrition for seasonal allergies, and how to eat well with a food allergy. For more, see our food allergy guides.

Jump to: Quick answer · Supplements and foods: the evidence · Vitamin C · Pollen and raw fruit · Eating well with a food allergy · FAQ

Quick answer

• Seasonal allergies: eat a varied diet with plenty of fruits and vegetables, but don’t expect any food to stop your symptoms. Medicines, avoiding triggers and saltwater nose rinses have better evidence.
• Vitamin C: adults need 75 to 90 mg a day. Don’t take 2,000 mg or more: that is the adult upper limit, and too much can cause diarrhea, nausea and stomach cramps.
• Probiotics: limited evidence suggests some may improve hay fever symptoms, but results vary by product.
• Herbs: butterbur may help hay fever symptoms but carries a liver risk; honey has no convincing evidence.
• Food allergy: strict avoidance of your trigger foods, careful label reading, and help from a dietitian to fill any nutrition gaps.

Supplements and foods: what the evidence shows

The National Center for Complementary and Integrative Health (NCCIH) and the NIH Office of Dietary Supplements have reviewed the popular options:

NCCIH’s overall view is that the evidence for most complementary approaches to seasonal allergies is limited or conflicting. The exception that isn’t a food: it says there is some good evidence that saltwater (saline) nasal rinses help. See our neti pot guide for how to do it safely.

Vitamin C: how much is enough?

Vitamin C is often called a “natural antihistamine,” but we found little reliable evidence for using it to treat allergies. Here is what the NIH Office of Dietary Supplements says you need:

Smokers need an extra 35 mg a day. Fruits and vegetables are the best sources, such as citrus fruits, red and green peppers, kiwi, broccoli, strawberries and tomatoes. Most people can get enough from food alone.

Taking too much can cause diarrhea, nausea and stomach cramps, and in people with hemochromatosis (an iron overload condition), high doses could make iron overload worse. Vitamin C supplements can also interact with some medicines, including some cancer treatments, so ask your doctor before taking high doses.

Pollen allergy and raw fruit

If raw fruits or vegetables make your mouth itch, the problem may be pollen food allergy syndrome. The American College of Allergy, Asthma and Immunology (ACAAI) says people with birch pollen allergy may react to raw apple, almond, carrot, celery, cherry, hazelnut, kiwi, peach, pear and plum, and that cooked forms are usually fine. Read our guide to birch pollen and food.

How to eat well with a food allergy

The American College of Allergy, Asthma and Immunology says the main way to manage a food allergy is to avoid the food that causes your reactions. Its advice:

1. Know the big ones. Eggs, milk, peanuts, tree nuts, fish, shellfish, wheat, soy and sesame cause most food allergy reactions.
2. Read every label. Check ingredient lists each time, and learn other names your allergen goes by.
3. Get help from a dietitian. ACAAI says a dietitian or nutritionist can suggest ways to avoid trigger foods while still meeting your nutritional needs. It can be especially useful if you avoid a staple food like milk or wheat.
4. Be ready for a reaction. Epinephrine is the first-line treatment for anaphylaxis. ACAAI advises using it right away for severe symptoms and carrying two doses.
5. Don’t cut foods on a hunch. Avoid only the foods an allergist has confirmed. ACAAI notes that a gluten intolerance, for example, is not an allergy, and allergy tests can’t diagnose it.

Eating out takes extra planning; see dining out with food allergies. For nut allergies, read is a nut-free diet safe?

Building a balanced plate when you avoid a food

• Swap within the same food group. If you avoid one protein, plan another; if you avoid a grain, choose other grains your allergist says are safe.
• Keep fruits and vegetables varied. They provide vitamin C and many other nutrients without any supplement.
• Ask before supplementing. A dietitian can tell you whether you actually need a supplement and at what dose.

This guide is general information, not medical advice. Read our medical disclaimer.

Frequently asked questions

What is the best diet for allergy sufferers?

A varied, balanced diet with plenty of fruits and vegetables. No specific diet has been shown to cure seasonal allergies. If you have a food allergy, the best diet avoids your trigger foods and is planned with a dietitian so you still get the nutrients you need.

Does vitamin C help allergies?

We found little reliable evidence that it does. Adults need 75 to 90 mg a day, which most people get from food. Avoid high-dose supplements of 2,000 mg or more, the adult upper limit, which can cause diarrhea, nausea and cramps.

Do probiotics help hay fever?

Maybe a little. NCCIH says some evidence suggests probiotics may improve some symptoms and quality of life, but it’s hard to know which types work, so firm conclusions can’t be drawn.

Is local honey good for allergies?

NCCIH says there is no convincing scientific evidence that honey relieves allergy symptoms. The CDC says never give honey to babies under 12 months old, because it can cause botulism.

What foods should I avoid if I have allergies?

Only the foods you have a confirmed allergy to. If raw fruits make your mouth itch during pollen season, you may have pollen food syndrome and can often eat those foods cooked. Talk to an allergist before cutting out whole food groups.

Should people with food allergies see a dietitian?

It often helps. ACAAI says a dietitian or nutritionist can suggest ways to avoid trigger foods while still meeting your nutritional needs.

Sources

• NIH Office of Dietary Supplements. Vitamin C fact sheet for consumers. Updated March 22, 2021.
• National Center for Complementary and Integrative Health. 6 things to know about complementary health approaches for seasonal allergy relief.
• National Center for Complementary and Integrative Health. Seasonal allergies and complementary health approaches: what the science says.
• National Center for Complementary and Integrative Health. Butterbur. Updated November 2024.
• American College of Allergy, Asthma and Immunology. Food allergy. Reviewed June 28, 2023.
• American College of Allergy, Asthma and Immunology. Pollen food allergy syndrome.
• Centers for Disease Control and Prevention. Foods and drinks to avoid or limit (infants and toddlers).

Last reviewed: October 21, 2026.