Definition

What Is Asthma?

Asthma is a chronic inflammatory disease of the airways causing reversible bronchoconstriction, mucus hypersecretion and airway hyperresponsiveness. Hallmark symptoms (wheezing, breathlessness, chest tightness, cough) result from narrowed, inflamed airways and twitchy smooth muscle.

Modern understanding identifies multiple asthma "phenotypes": allergic/eosinophilic (Th2-⁠high, about half of people with mild to moderate asthma in one study¹⁰), non-allergic, exercise-induced, aspirin-exacerbated and obesity-associated. Each responds differently to treatment: biologics⁶ target specific Th2 pathways, while obesity-related asthma improves with weight loss.

The gut-lung axis is an active area of research in asthma. Children given antibiotics in their first 3 years were more likely to develop asthma in cohort studies, an association rather than proof of cause, and no gut treatment is established for asthma¹¹. In trials, vitamin D supplements did not reduce asthma attacks³.

⚠️ NEVER discontinue prescribed asthma controllers¹ (inhaled corticosteroids) without medical guidance, even when feeling better. Uncontrolled asthma can be fatal. Use holistic approaches IN ADDITION to controllers; aim to reduce reliance on rescue inhalers, not replace controllers.

Two airways in cross-section: a normal airway (wide open) and an asthma airway narrowed by tightened muscles, a swollen wall and mucus, above four faces showing coughing, wheezing, shortness of breath and chest tightness

Major Asthma Phenotypes

Allergic/Eosinophilic

Th2-⁠driven. Triggered by allergens (dust mites, pollen, pet dander). Elevated IgE, eosinophils. Responds well to inhaled steroids; severe cases benefit from biologics (omalizumab, mepolizumab, dupilumab).

Non-Allergic / Exercise-Induced

Often adult-onset when non-allergic; exercise-induced symptoms occur at any age. Triggered by infection, cold air, exercise, stress, irritants. Often less responsive to steroids. Vagal/autonomic factors. Breathing exercises may improve quality of life⁸.

Obesity-Associated

Adult-onset, often in women. Driven by metabolic inflammation, mechanical restriction. Less Th2-⁠eosinophilic. Often improves with weight loss.

Causes

Causes of Asthma

It is not fully understood what causes asthma¹⁵; these are the factors with the clearest links, and the things that set off symptoms once it has started.

Cause	How It Contributes to Asthma	What Helps
Family history and allergies	Asthma is more likely when a parent or sibling has it, and in people with other allergic conditions²⁰	A preventer inhaler taken as prescribed, and allergy testing where a trigger is suspected, as the diagnosis section describes
Allergens and irritants at home and at work	House dust mites, molds, pollen, animal fur, smoke and fumes set off symptoms, and chemicals, fumes or dust at work can cause asthma²⁰	Reducing exposure to your own triggers, as the treatment section describes, and moving away from a trigger at work
Tobacco smoke and air pollution	Tobacco smoke and air pollution in early life raise the risk of asthma²⁰, and smoking or breathing secondhand smoke makes asthma harder to treat²¹	Stopping smoking and avoiding secondhand smoke and vaping, as the treatment section lists
Chest infections	Viral respiratory infections in early life raise the risk of developing asthma²⁰, and viruses such as flu make symptoms worse at any age¹⁵	The yearly flu vaccine the treatment section lists, and your written action plan when symptoms flare
Excess weight	Children and adults with overweight or obesity are at greater risk of asthma²⁰; in trials in adults with obesity and asthma, weight loss over 12 to 24 weeks improved asthma control and lung function²²	Gradual weight loss, as the treatment and diet sections describe; in the trials the benefit had faded by a year, so it lasts only while the weight stays off
Early life: prematurity, low birth weight, early antibiotics	Prematurity and low birth weight raise the risk²⁰; children given antibiotics in their first 3 years were more likely to develop asthma in cohort studies, an association rather than proof of cause¹¹	Nothing on this page changes early-life risk; once asthma is present, the preventer inhaler and trigger control are what help
Certain medicines	Some anti-inflammatory painkillers and beta blockers can set off asthma symptoms in some people¹⁵	Checking with a pharmacist or doctor before taking a medicine for another condition; never stop a prescribed medicine on your own

Treatment Comparison

Conventional and Holistic Treatment for Asthma

🌿 HOLISTIC

💊 CONVENTIONAL

🌿

Holistic / Functional Approach

Reduce inflammation and identify triggers; the gut-lung axis is being studied, with no gut treatment established. ALWAYS used WITH (not instead of) controllers.

Trigger Avoidance⁵

Identify and reduce exposure to dust mites, mold and pet dander, and avoid foods only where an allergy is confirmed

Anti-Inflammatory

A diet high in fruit and vegetables is linked with better control⁴; vitamin D supplements did not prevent attacks in trials³; omega-⁠3 trials have been largely disappointing⁴

Breathing Retraining

Buteyko, diaphragmatic and similar breathing exercises may improve quality of life and hyperventilation symptoms, with moderate to very low-certainty evidence⁸

Gut-Lung Axis

Being studied; probiotics gave a small lung function benefit in trials, not enough for routine use¹¹

Full Holistic Approach Includes

Identify triggers: dust mite encasings, HEPA filter, remove pets if allergic, mold remediation
Avoid dairy only if you have a confirmed milk allergy.
If a food seems to set off symptoms, ask about allergy testing, for example for wheat, eggs, soy or peanuts, rather than cutting foods out on your own.
Vitamin D: set the dose with your clinician; most adults need no blood test first. A 2023 review of 20 trials found it did not reduce asthma attacks, so correct a deficiency for general health, not as asthma treatment³. Dosing limits: the adult tolerable upper intake level is 4,000 IU/day. The Endocrine Society's 2024 guideline found no clear evidence for an optimal target level; the National Academies (formerly the Institute of Medicine) set sufficiency at 20 ng/mL (50 nmol/L). Any dose above 4,000 IU/day needs a blood test and a clinician.
Omega-⁠3 EPA/DHA 2,000 to 3,000 mg/day, agreed on with your clinician (see the supplement table); trials in asthma have been largely disappointing⁴, and check with your clinician first if you take a blood thinner⁷
Magnesium, not recommended: oral magnesium did not reduce reliever use or symptoms in trials, and magnesium given into a vein in the hospital for a severe attack is a different treatment that says nothing about tablets.⁴ The upper intake level for supplemental magnesium is 350 mg/day; above that, diarrhea is common. With kidney disease, take it only on your clinician's advice.
Mediterranean diet, vegetables, fruits, fatty fish, olive oil.
Address obesity: weight loss improves asthma control in the obesity-associated phenotype
Buteyko breathing retraining may improve quality of life and hyperventilation symptoms
Avoid sulfites (wine, dried fruits) if they trigger symptoms
Stop smoking and avoid secondhand smoke, one of the most useful steps; vaping is also harmful.
Annual flu vaccine and COVID-⁠19 boosters: viral infections are major triggers

⚠️ Critical Safety Note: NEVER stop your controller inhaler without medical supervision, even when feeling perfectly fine. Asthma deaths often occur in patients who felt well and discontinued controllers. Use holistic approaches to add benefit, not replace life-saving medications.

💊

Conventional / Medical Approach

Stepwise therapy guided by the Global Initiative for Asthma (GINA): controllers (ICS-formoterol, an inhaled corticosteroid combined with formoterol), a rescue inhaler (SABA, a short-acting reliever) and biologics for severe disease

First-Line (since 2019)

ICS-formoterol (budesonide-formoterol) as both controller and reliever replaces the traditional SABA-only approach

Step Up

Add LABA, leukotriene antagonist (montelukast), tiotropium

Severe Asthma

Biologics: omalizumab (anti-IgE), mepolizumab (anti-IL-⁠5), benralizumab (anti-IL-⁠5R), dupilumab (anti-IL-⁠4Rα)⁶

Bronchial Thermoplasty

Procedural option for severe persistent asthma, heats and reduces airway smooth muscle

Conventional Approach Includes

Step 1 to 2: low-dose ICS-formoterol as needed, rather than SABA alone.
Step 3: low-dose ICS-formoterol as a daily controller and as needed
Step 4: medium-dose ICS-formoterol maintenance and reliever
Step 5: high-dose ICS and add-on therapies; biologics if eligible
Inhaled corticosteroids (ICS): budesonide, fluticasone, mometasone, anti-inflammatory; far fewer systemic side effects than oral steroids, though high doses can have some
LABA (long-acting beta-agonist): salmeterol, formoterol, always combined with ICS (never alone)
Leukotriene antagonists: montelukast, useful especially for allergic asthma; black-box warning for neuropsychiatric effects
LAMA (long-acting muscarinic): tiotropium, adjunct for poorly controlled asthma
Biologics for severe Th2-⁠high asthma: omalizumab (anti-IgE), mepolizumab/reslizumab (anti-IL-⁠5), benralizumab (anti-IL-⁠5R), dupilumab (anti-IL-⁠4Rα), IV/SC every 2 to 8 weeks
Oral corticosteroids: reserved for exacerbations; long-term use minimized due to side effects
Rescue inhaler (SABA): albuterol, for acute relief; high use indicates poor control

⚠️ Major Change Since 2019 ¹²: GINA guidelines no longer recommend SABA-only treatment. ICS-formoterol used as both maintenance and reliever (MART) reduces severe exacerbations compared with SABA-only treatment.

Supplement Protocol

Evidence-Based Supplements for Asthma

No supplement replaces a preventer inhaler, and in trials vitamin D did not reduce attacks³. Use alongside (not instead of) prescribed controllers.

Supplement	What it is for	Typical range	Timing	Notes & cautions
Vitamin D3	Did not reduce attacks needing steroid tablets or improve control in a 2023 review of 20 trials³. Worth correcting a deficiency for general health.	Set the dose with your clinician; most adults need no blood test first	With fat meal	Pair with K2 200 mcg. If you take warfarin, clear any vitamin K supplement with the clinician managing your anticoagulation before starting or stopping it: vitamin K antagonizes warfarin, and changing your intake destabilizes the INR. Consistency matters more than avoidance. This does not apply in the same way to direct oral anticoagulants such as apixaban or rivaroxaban, but tell your prescriber about any supplement you take.
Omega-⁠3 (EPA/DHA)	Anti-inflammatory; reduces leukotrienes. May reduce exercise-induced bronchoconstriction.	2,000 to 3,000 mg EPA+DHA/day	With fat meal	Trials in asthma have been largely disappointing⁴. If you take a blood thinner, agree on it with your clinician first, since clotting may need monitoring⁷. In heart trials, fish oil supplements raised the risk of atrial fibrillation, an irregular heartbeat, more so above 1 g a day²⁵, so check this dose with your clinician first.
Magnesium	Relaxes airway muscle. Magnesium given into a vein in the hospital for a severe attack is a different treatment and is not evidence for tablets; oral magnesium did not reduce reliever use or symptoms in trials⁴.	Not recommended for asthma (trials found no change in symptoms or reliever use)	Not applicable	The upper intake level for supplemental magnesium is 350 mg/day; above that, diarrhea is common. With kidney disease, take it only on your clinician's advice.
Quercetin	Evidence in asthma comes from laboratory and animal studies; human studies are scarce¹⁶.	500 to 1,000 mg/day	Empty stomach (15 min before meals)	Often combined with bromelain for absorption.
N-Acetyl Cysteine (NAC)	Mucolytic, thins thick mucus. Glutathione precursor. Its trial evidence comes from COPD and chronic bronchitis; those reviews left out people with asthma¹³.	600 to 1,800 mg/day	Divided doses	Sulfur smell.
Vitamin C	Antioxidant. May reduce exercise-induced bronchoconstriction. Antihistamine effects.	500 to 2,000 mg/day	Divided doses	Liposomal forms easier on stomach. The adult upper intake level is 2,000 mg a day, and the body converts vitamin C to oxalate, so if you have had kidney stones, ask your clinician first.
Probiotics (Lactobacillus, Bifidobacterium)	Studied for the gut-lung axis; evidence for reducing asthma severity is limited.	10 to 30 billion CFU/day, multi-strain	With or without food	A 2026 review of 13 trials in adults found a small lung function benefit, not enough to justify routine use¹¹.
Boswellia (Frankincense)	Inhibits 5-⁠lipoxygenase (the same enzyme targeted by zileuton) in laboratory work, reducing leukotrienes. Anti-inflammatory.	300 to 400 mg, 3x/day (standardized to 60% boswellic acids)	With meals	Well-tolerated. The trial behind its use in asthma was small: 80 adults for 6 weeks¹⁴.

References & Evidence Notes

Each numbered entry below is either a source you can follow or a note setting out what the evidence does and does not support. Both are numbered together so the markers in the text line up.

Last reviewed October 20, 2026. Supplement entries are cross-checked against the NIH National Center for Complementary and Integrative Health and the Linus Pauling Institute Micronutrient Information Center.⁷ Never stop your preventer inhaler because you feel well. Inhaled corticosteroids work by suppressing the underlying airway inflammation, so feeling fine is what success looks like, and stopping them is a recognized contributor to fatal asthma attacks. Relying on a reliever (rescue) inhaler alone is no longer recommended. Know the emergency signs: inability to speak in full sentences, blue lips or fingertips, or a chest that has gone quiet because too little air is moving. Those mean emergency services immediately. Everything nutritional on this page works alongside inhalers, never instead of them.

On inhaled corticosteroids. Asthma is an inflammatory disease, and inhaled corticosteroids treat the inflammation while short-acting beta-agonists only relieve bronchoconstriction. Global Initiative for Asthma guidance no longer recommends reliever-only treatment for adults and adolescents, because SABA-only management is associated with increased exacerbations and death, and because over-reliance on a reliever masks deteriorating control. Using a reliever more than about twice a week suggests inadequate control. ↩
On recognizing a severe attack. Inability to complete sentences, use of accessory muscles, a respiratory rate that is climbing, exhaustion, cyanosis and a silent chest, where wheeze disappears because airflow is too poor to generate it, all indicate life-threatening asthma. A silent chest is more dangerous than loud wheezing, which is counterintuitive and is why it is worth knowing in advance. A written asthma action plan improves outcomes and should exist before it is needed. ↩
On vitamin D: an earlier Cochrane review suggested that vitamin D supplementation reduced asthma attacks needing steroid tablets. Its 2023 update, with 20 trials in children and adults, found no reduction in those attacks, no improvement in asthma control and no difference by baseline vitamin D level, although profound deficiency was rare in the trials, PubMed 36744416. Correcting a deficiency is reasonable for general health; vitamin D is not a treatment for asthma. The adult tolerable upper intake level is 4,000 IU/day. ↩
On other supplements and diet: magnesium is a bronchodilator and intravenous magnesium is used in emergency treatment of severe attacks, but that is a hospital treatment and is not evidence for tablets: a 2019 review of 8 trials in 917 people found oral magnesium improved one lung function measure at 8 weeks only, with no change in reliever use or symptoms, PubMed 30778086. Omega-⁠3 trials have been largely disappointing. A diet high in fruit and vegetables is associated with better asthma control observationally. Obesity worsens asthma control and weight loss improves it, which is one of the better-supported lifestyle levers. ↩
On triggers and comorbidities: allergen exposure, respiratory infection, exercise, cold air, smoke and air pollution are common triggers. Aspirin-exacerbated respiratory disease affects a minority and matters because NSAIDs can precipitate severe attacks. Allergic rhinitis, reflux, obesity and obstructive sleep apnea all worsen control and are treatable in their own right. ↩
On biologic therapy: for severe asthma, monoclonal antibodies targeting IgE, IL-⁠5 and IL-⁠4/13 substantially reduce exacerbations and oral steroid dependence in appropriately selected patients. Anyone requiring frequent courses of oral steroids should be assessed for these rather than continuing on repeated courses of prednisone, which carries substantial cumulative harm. ↩
National Center for Complementary and Integrative Health (NIH), nccih.nih.gov, and the Linus Pauling Institute Micronutrient Information Center, lpi.oregonstate.edu/mic. ↩
On breathing exercises: a 2020 Cochrane review of 22 randomized trials in 2,880 adults with mild to moderate asthma, covering Buteyko, yoga, Papworth and diaphragmatic breathing, found that breathing exercises may improve quality of life, hyperventilation symptoms and lung function, with evidence ranging from moderate to very low certainty, PubMed 32212422. ↩
On confirming asthma with spirometry: the Global Initiative for Asthma 2025 summary guide lists significant bronchodilator responsiveness in adults as FEV1 or FVC increasing by 12% and by 200 mL from the pre-bronchodilator value, alongside other ways to show variable airflow such as peak flow variability over 2 weeks and a positive bronchial challenge test, ginasthma.org. ↩
On asthma types: airway samples from 42 people with mild to moderate asthma split into two evenly sized groups by gene expression, Th2-⁠high and Th2-⁠low, with the Th2-⁠low group indistinguishable from healthy controls, PubMed 19483109. ↩
On the gut and asthma: in four childhood cohorts, children given antibiotics in their first 3 years were more likely to develop asthma (odds ratio 2.18), an observed association, PubMed 28423467; and a 2026 review of 13 trials of probiotics, prebiotics or synbiotics in adults with asthma found a mild benefit on lung function, no significant change in asthma control scores, and concluded that the evidence does not justify routine use, PubMed 42614164. ↩
On reliever-only treatment: the Global Initiative for Asthma strategy of 2019 stopped recommending treatment with short-acting bronchodilators alone for adults and adolescents, PubMed 31249014. ↩
On N-acetylcysteine: a Cochrane review of 38 trials of oral mucolytics, including N-acetylcysteine, in chronic bronchitis or COPD found that more people stayed free of flare-ups on treatment, with smaller effects in longer and more recent studies. People with asthma were excluded, so the review does not show a benefit in asthma, PubMed 31107966. ↩
On boswellia: a 6-⁠week double-blind trial in 80 adults with asthma, 40 given 300 mg of gum resin three times a day and 40 given placebo, reported improvement in 70% of the treated group against 27% on placebo; it is a small, short trial, PubMed 9810030. ↩
On living with asthma: NHS guidance notes that the cause of asthma is not fully understood, lists allergies, a family history, prematurity or low birth weight, childhood smoke and pollution exposure, early chest illnesses, excess weight and chemicals at work among the risks, and warns that some painkillers and beta blockers can set off symptoms. It advises a written asthma action plan, a checkup at least once a year that includes inhaler technique, a flu vaccine, not smoking and keeping to a healthy weight, and seeing a doctor within 2 days of any attack even after recovering, NHS, asthma. ↩
On quercetin: a 2025 review of quercetin in allergic disease reports that the support for its use in asthma comes from preclinical (laboratory and animal) studies, and that human studies are scarce, with only two clinical trials of quercetin alone across all allergic diseases, PubMed 40362785. ↩
On curcumin: in a double-blind trial, 60 adults with non-allergic asthma took 40 mg of nano-curcumin three times a day or placebo alongside standard treatment for 60 days, and lung function, asthma control and quality of life did not differ from placebo, PubMed 38966624; a 2021 trial protocol describes the earlier results in asthma as limited and mixed, PubMed 34404358. ↩
On how common asthma is in the US: CDC figures from the 2023 National Health Interview Survey estimate that 27.8 million people had current asthma, 8.4% of the population, including 23.0 million adults (8.9%) and 4.8 million children (6.7%), and national death records count 3,624 deaths from asthma in 2023, CDC, most recent asthma data. ↩
On what asthma costs: an analysis of US national survey data for 2008 to 2013 put the total cost of asthma at $81.9 billion in 2013, made up of $50.3 billion in medical costs, $29 billion from deaths and $3 billion from missed work and school days, PubMed 29323930. ↩
On asthma worldwide and what raises the risk: WHO estimates that asthma affected 363 million people in 2023 and caused 442,000 deaths. It lists a family history of asthma, other allergic conditions, low birth weight, prematurity, early exposure to tobacco smoke and air pollution, viral respiratory infections, house dust mites, molds, chemicals, fumes or dust at work, and overweight or obesity among the factors linked to asthma, and names inhaled medication as the treatment that controls it, WHO, asthma. ↩
On smoke and asthma: NIH guidance states that smoking tobacco and breathing secondhand smoke make asthma harder to treat, and that vaping and secondhand vapor may also worsen symptoms, NHLBI, living with asthma. ↩
On weight loss: a review of 6 randomized trials in 522 adults with obesity and asthma found that weight loss over 12 to 24 weeks improved asthma control, quality of life and lung function, most markedly in people who lost 10% or more of their weight, but the benefits were not sustained at 52 weeks, PubMed 41242610. ↩
On how a preventer inhaler works over time: NHS guidance on steroid preventer inhalers says they do not work right away; people usually wheeze less or feel less breathless after 3 to 7 days, the full benefit can take several weeks, reliever use should fall as symptoms improve, a doctor or nurse should hear promptly if there is no improvement after 7 days, and stopping suddenly can bring breathing problems back, NHS, steroid preventer inhalers. ↩
On when an attack is an emergency: US guidance advises going to the emergency room or calling emergency services at once for drowsiness or confusion, severe shortness of breath at rest, blue lips or face, extreme difficulty breathing or difficulty speaking, MedlinePlus, asthma; asthma charity guidance adds calling an ambulance if you feel worse at any point or your reliever does not help, Asthma + Lung UK, asthma attacks. ↩
Gencer B, Djousse L, Al-Ramady OT, Cook NR, Manson JE, Albert CM. Effect of long-term marine omega-⁠3 fatty acids supplementation on the risk of atrial fibrillation in randomized controlled trials of cardiovascular outcomes: a systematic review and meta-analysis. Circulation. 2021;144(25):1981-⁠1990. PubMed 34612056. Seven trials with 81,210 people followed for about 5 years: omega-⁠3 supplements were linked to a higher risk of atrial fibrillation (hazard ratio 1.25), more so in trials of more than 1 g a day (1.49), and the risk rose with each additional gram. ↩
On the Asthma Control Test: in a survey of 570 adults with asthma, the score that best separated well-controlled asthma was confirmed to be 20 or higher, and 15 or lower marked poorly controlled asthma, PubMed 18069909. ↩

Symptom	What happens
Typical Daily Symptoms
Wheezing	High-pitched whistling sound during breathing (usually exhalation). Caused by airflow through narrowed bronchi. May be subtle or loudly audible.
Shortness of Breath	Sensation of inability to breathe deeply. Worsens with exertion, exposure to triggers. Difficulty completing sentences in severe attacks.
Chronic Cough	Often the only symptom in "cough-variant asthma." Worse at night, with exercise or after viral infections. Sometimes productive of clear mucus.
Chest Tightness	Sensation of band around chest. Caused by bronchial smooth muscle constriction. May be mistaken for cardiac chest pain.
Severe Attack (Emergency)
Inability to Complete Sentences	Single words between breaths. Sign of severe airflow obstruction. Call 911 now, and use your rescue inhaler while you wait.
Use of Accessory Muscles	Visible neck/chest muscles working hard with each breath. Tripod position (leaning forward, hands on knees). Indicates respiratory distress.
Cyanosis (Blue Lips/Fingers)	Bluish tinge of lips, fingertips. Sign of hypoxia. LIFE-THREATENING, call 911 immediately.
Silent Chest	PARADOXICAL: in severe attack, wheezing may disappear as airflow is too low to produce sound². Most ominous sign. 911 immediately.

Test	What it shows
Pulmonary Function Testing
Spirometry (Gold Standard)	Measures FEV1 (forced expiratory volume) and FVC. In adults, a rise in FEV1 or FVC of 12% and 200 mL after a bronchodilator supports an asthma diagnosis⁹. It is the main test used to confirm asthma, though tracking peak flow over two weeks or a challenge test can also confirm it.
Peak Flow Monitoring	Daily home monitoring of peak expiratory flow. Track personal best, recognize drops indicating impending exacerbation. Useful for self-management plans.
Methacholine Challenge	Used when spirometry normal but asthma suspected. Inhalation of methacholine triggers bronchoconstriction in asthmatics. Negative test rules out asthma.
FeNO (Exhaled Nitric Oxide)	Marker of eosinophilic airway inflammation. Elevated FeNO predicts steroid-responsive asthma. Useful for phenotyping and treatment selection.
Phenotyping & Trigger ID
CBC with Eosinophil Count	An eosinophil count of 300 cells/µL or more indicates the eosinophilic phenotype. Important for biologic therapy selection. Total IgE level also informative.
Allergy Testing	Skin prick tests or specific IgE blood tests. Identify triggers: dust mites, pet dander, cockroaches, molds, pollens, foods. Guides avoidance and treatment.
Vitamin D Level	Low vitamin D correlates with worse asthma control and more exacerbations; a level is checked where deficiency is suspected.
Asthma Control Tools (ACT, ACQ)	Validated questionnaires for assessing control over preceding weeks. An ACT score below 20 suggests asthma is not well controlled²⁶. Track over time.

What to eat or do	Details
✅ Prioritize:
Fatty Fish (2 to 3x/week)	Wild salmon, sardines, Atlantic mackerel, herring. Good for heart health; omega-⁠3 trials in asthma have been largely disappointing.
Colorful Fruits & Vegetables	5 to 7+ servings daily. High intake of apples, tomatoes, leafy greens specifically associated with better lung function and lower asthma rates.
Berries & Quercetin-Rich Foods	Berries, apples, onions, capers, red grapes. In asthma, the evidence for quercetin comes from laboratory and animal studies; human studies are scarce¹⁶.
Honey (Local Raw)	Cough suppressant. Local honey may help with seasonal allergies (limited evidence). 1 to 2 tsp/day. Not for children under 1.
Turmeric is not on this list because its compound curcumin, added to usual asthma treatment in a 60-⁠person trial, did no better than placebo on lung function or asthma control¹⁷.
❌ Limit or Try Eliminating:
Dairy (Only If Allergic)	Avoid only if you have a confirmed milk allergy; dairy has not been shown to increase mucus in asthma.
Sulfites & Food Additives	Wine, beer, dried fruits, restaurant salad bars, processed foods. Sulfites trigger bronchospasm in a minority of people with asthma.
Refined Grains & Sugar	Worth limiting as part of a generally healthy diet. White bread, pastries, sodas, sweets.
Processed/Fast Food	Trans fats, additives. Frequent fast food has been associated with more severe asthma in children and adolescents in survey data.
Known Allergens	Eggs, peanuts, tree nuts, soy, wheat, if allergic. Anaphylaxis can present with asthma-like symptoms. Carry epinephrine if at risk.

Asthma

What Is Asthma?

Major Asthma Phenotypes

Allergic/Eosinophilic

Non-Allergic / Exercise-Induced

Obesity-Associated

Asthma by the Numbers

Symptoms of Asthma

Causes of Asthma

How Asthma Is Diagnosed

Conventional and Holistic Treatment for Asthma

Holistic / Functional Approach

Full Holistic Approach Includes

Conventional / Medical Approach

Conventional Approach Includes

Diet for Asthma

Evidence-Based Supplements for Asthma

What to Expect Over Time

Better Control Is Possible

References & Evidence Notes

Asthma

What Is Asthma?

Major Asthma Phenotypes

Allergic/​Eosinophilic

Non-Allergic / Exercise-Induced

Obesity-Associated

Asthma by the Numbers

Symptoms of Asthma

Causes of Asthma

How Asthma Is Diagnosed

Conventional and Holistic Treatment for Asthma

Holistic / Functional Approach

Full Holistic Approach Includes

Conventional / Medical Approach

Conventional Approach Includes

Diet for Asthma

Evidence-Based Supplements for Asthma

What to Expect Over Time

Related Conditions

Better Control Is Possible

References & Evidence Notes

Allergic/Eosinophilic