14 Foods for Healthy Lungs and Improved Breathing
By Irene A. Paragas, MD | Medically reviewed | October 2026 | 11 min read
Your lungs process around 10,000 litres of air every day, and everything in that air passes through tissue that is only a few cells thick.
That makes them unusually exposed to oxidative stress, and unusually responsive to what you eat.
This is not wishful thinking. A ten-year European study tracked lung function in thousands of adults using spirometry, and found measurable differences in the rate of decline based on diet alone.
Below are 14 foods with genuine research behind them, what each one actually contains, and how much you would need to eat for it to matter.
Read This First
Food supports lung health. It does not treat lung disease.
If you have asthma, COPD, or any diagnosed respiratory condition, nothing on this list replaces your prescribed treatment. These foods work alongside medical care, never instead of it.
And if you are newly short of breath, wheezing, or coughing persistently, see a doctor before changing your diet. Those symptoms need a cause identified.
The Strongest Evidence We Have
Most lung-health food lists cite nothing. This one starts with the study that matters most.
The Ageing Lungs in European Cohorts study, led by Imperial College London with Johns Hopkins, measured lung function in adults across three European countries using spirometry, then repeated the same tests ten years later.
Two findings stood out.
The intake that produced these results was specific: more than two tomatoes or more than three portions of fresh fruit daily, compared with less than one of either.
That is a realistic target, and it is the benchmark worth holding in mind as you read the rest of this list.
The 14 Foods
1. Tomatoes
What is in them: Lycopene, a carotenoid antioxidant that concentrates in lung tissue, plus vitamin C and potassium.
The evidence: This is the single best-supported food on the list. The ALEC study found tomato intake associated with slower FVC decline, and it was the association that survived statistical correction.
How to eat it: Cooked tomatoes deliver more available lycopene than raw, because heat breaks down cell walls. Lycopene is also fat-soluble, so a little olive oil meaningfully improves absorption. Tinned tomatoes count.
2. Apples
What is in them: Quercetin, a flavonoid with antioxidant and anti-inflammatory activity, plus soluble fibre and vitamin C.
The evidence: Apple and banana intake tracked with slower FEV1 decline over the ten-year follow-up.
How to eat it: Keep the skin on. Most of the quercetin sits in or just beneath it, so peeling removes much of the benefit.
3. Beetroot
What is in it: One of the richest dietary sources of nitrate.
The evidence: Your body converts dietary nitrate into nitric oxide, which relaxes both blood vessels and airway smooth muscle. Research has shown beetroot juice raises exhaled nitric oxide, and nitrate supplementation lowers the oxygen cost of submaximal exercise, meaning you use less oxygen for the same work.
How to eat it: Juice has the highest nitrate concentration. If you are using it before exercise, allow two to three hours for the conversion. Harmless note: it can turn urine pink.
4. Broccoli and Broccoli Sprouts
What is in them: Sulforaphane, produced when you chop or chew the vegetable.
The evidence: Sulforaphane activates the NRF2 pathway, which switches on the body’s own antioxidant and detoxification genes. This is one of the better-characterised mechanisms in nutritional science, and lung tissue is a tissue where it is studied specifically.
How to eat it: Broccoli sprouts contain far more sulforaphane precursor than mature broccoli. Avoid boiling, which destroys the enzyme needed to form it. Steam lightly, or chop and let it stand ten minutes before cooking.
5. Oily Fish
What is in it: Long-chain omega-3 fatty acids, EPA and DHA.
The evidence: Omega-3s are incorporated into cell membranes and shift the body’s production of signalling molecules toward less inflammatory ones. Airway inflammation is central to asthma and COPD.
How to eat it: Salmon, mackerel, sardines and herring. Two portions weekly is the standard recommendation. Tinned sardines are inexpensive and include the bones, which adds calcium.
6. Berries
What is in them: Anthocyanins, the pigments responsible for deep red, purple and blue colouring.
The evidence: Anthocyanins are potent antioxidants, and several cohort studies have linked higher flavonoid intake with better lung function measures.
How to eat it: Blueberries, blackcurrants, blackberries. Frozen retain their anthocyanin content and cost considerably less.
7. Leafy Greens
What is in them: Dietary nitrate, folate, magnesium, and carotenoids including lutein.
The evidence: Rocket, spinach and chard rival beetroot for nitrate content, feeding the same nitric oxide pathway. Magnesium also plays a role in bronchial smooth muscle relaxation.
How to eat it: Raw or lightly cooked. Prolonged boiling leaches both nitrate and folate into the water.
8. Red Bell Peppers
What is in them: More vitamin C per serving than citrus, plus beta-carotene.
The evidence: Vitamin C concentrates in the fluid lining the airways, where it acts as a first line of antioxidant defence against inhaled oxidants.
How to eat it: Raw preserves the most vitamin C, which is heat-sensitive. Red peppers contain substantially more than green.
9. Citrus Fruit
What is in it: Vitamin C, plus flavonoids including hesperidin and naringenin.
The evidence: Part of the fresh fruit intake associated with slower lung function decline. Vitamin C status is consistently lower in smokers, who also deplete it faster.
How to eat it: Whole fruit over juice. The fibre and the flavonoids in the pith are both lost in juicing.
10. Turmeric
What is in it: Curcuminoids, primarily curcumin.
The evidence: Curcumin has well-documented anti-inflammatory activity in laboratory and animal models. Human respiratory evidence is more limited, so treat this as supportive rather than central.
How to eat it: Curcumin is poorly absorbed. Take it with fat and black pepper, which together improve bioavailability considerably more than turmeric alone.
11. Ginger
What is in it: Gingerols and shogaols.
The evidence: Anti-inflammatory compounds with laboratory evidence suggesting relaxant effects on airway smooth muscle. Human trials remain preliminary.
How to eat it: Fresh grated into tea, stir-fries or juice. Shogaols increase when ginger is dried or gently heated.
12. Green Tea
What is in it: Catechins, particularly EGCG.
The evidence: Observational research has linked regular green tea consumption with better lung function measures, though confounding is difficult to rule out in this kind of study.
How to drink it: Brew at around 80C rather than boiling. Water that is too hot degrades catechins and makes it bitter.
13. Pumpkin and Orange Squash
What is in them: High concentrations of beta-carotene and other carotenoids.
The evidence: Carotenoid levels in blood correlate with lung function in population studies. Beta-carotene also converts to vitamin A, which maintains the integrity of the epithelial lining throughout the respiratory tract.
How to eat it: Roast with a little olive oil. Carotenoids are fat-soluble, so the fat genuinely matters here.
14. Nuts and Seeds
What is in them: Vitamin E, magnesium, and plant-based omega-3 in the form of ALA.
The evidence: Vitamin E is the primary fat-soluble antioxidant protecting cell membranes, including those lining the airways. Magnesium contributes to bronchial muscle relaxation.
How to eat it: Sunflower seeds and almonds lead on vitamin E. Walnuts and ground flaxseed lead on ALA. A small handful daily is sufficient.
A Day That Covers Most of This List
You do not need to eat all fourteen. Here is what covering the majority looks like in practice.
That single day covers eleven of the fourteen, clears the two-tomato threshold, and comfortably exceeds three portions of fruit.
Four Habits That Undo the Benefit
Adding good food matters less if these are working against you.
- Smoking and vaping. Nothing on this list comes close to the effect of stopping. The ALEC researchers were explicit that diet helps ex-smokers, not current ones, and the damage continues while you smoke.
- Ultra-processed food. Several cohort studies associate high intake with poorer lung function and increased respiratory symptoms, independent of smoking.
- Excess alcohol. It impairs the function of the cilia that clear mucus and particles from your airways.
- Indoor air you ignore. Gas hob without extraction, wood burners, aerosol cleaning products. Your lungs process far more of your indoor air than your outdoor air.
A note on portion thresholds. The lung function benefits in the research came from meaningful daily intake, not occasional consumption. One tomato a week will not register. The comparison groups were more than two tomatoes daily versus less than one, which is a substantial gap.
When Food Is Not the Answer
Please take this part seriously.
Diet supports healthy lungs over years. It does not address acute or progressive symptoms, and some of those symptoms need prompt attention.
See a doctor if you have:
- New or worsening breathlessness, particularly at rest or on mild exertion
- A cough lasting more than three weeks
- Wheezing you have not had before
- Coughing up blood
- Chest tightness or pain with breathing
- Unexplained weight loss alongside respiratory symptoms
- Repeated chest infections
Asthma, COPD, sleep apnea, anaemia, heart failure and thyroid disorders can all present as breathlessness. Most are treatable once identified, and a simple spirometry test takes minutes.
Frequently Asked Questions
Which single food is best for lung health?
Tomatoes have the strongest individual evidence. In the ten-year ALEC study, tomato intake was associated with slower decline in lung capacity, and it was the association that remained statistically significant after correction for multiple comparisons.
How long before diet affects my breathing?
The research measures lung function decline over years, not weeks. You may notice secondary improvements sooner, such as better exercise tolerance from beetroot’s effect on oxygen efficiency, but the lung tissue benefits are slow and cumulative.
Can food reverse smoking damage?
Partly, and only after you stop. Ex-smokers eating the most tomatoes and fruit showed roughly 80 mL less lung function decline over ten years, which researchers suggested indicates some repair. The same benefit was not found in current smokers.
Do supplements work as well as whole foods?
Generally no. Isolated antioxidant supplements have performed poorly in trials compared with whole food intake, and high-dose beta-carotene supplementation specifically increased lung cancer risk in smokers in two large trials. Eat the food rather than extracting the compound.
Will these foods help my asthma?
They may support overall airway health, but they are not a treatment and must never replace prescribed inhalers or controller medication. Discuss any dietary changes with the clinician managing your asthma.
Does beetroot really make breathing easier?
Beetroot is high in dietary nitrate, which converts to nitric oxide and relaxes both blood vessels and airway smooth muscle. Research has shown it raises exhaled nitric oxide and lowers the oxygen cost of submaximal exercise. The clearest effects are on exercise efficiency rather than on breathing at rest.
Is cooking better or worse for these foods?
It depends which. Cooking improves lycopene availability in tomatoes and carotenoid absorption from squash. It reduces vitamin C in peppers and citrus, and boiling destroys the enzyme that produces sulforaphane in broccoli. Eat a mixture of raw and cooked.
How much do I actually need to eat?
The benchmark from the research is more than two tomatoes or more than three portions of fresh fruit daily. That was the high-intake group, compared against people eating less than one of either.
The Bottom Line
Your lungs are exposed to more environmental stress than almost any other organ, and the research shows diet measurably affects how fast their function declines.
Tomatoes and apples have the clearest evidence. Beetroot has the most immediate effect on oxygen efficiency. Broccoli and oily fish work through well-mapped mechanisms. The rest of the list contributes antioxidants, nitrate and anti-inflammatory compounds that all point the same direction.
But keep the hierarchy straight. Not smoking outweighs every food on this list combined. Air quality at home comes next. Diet is the third lever, and it is a real one, especially for former smokers whose lungs still have repair capacity.
Start with the tomatoes and the fruit, because that is where the ten-year data actually points.
And if your breathing has changed recently, book the appointment first. Food is for the long game, and symptoms need a cause.
References
- Dietary antioxidants and 10-year lung function decline in adults from the ECRHS survey – European Respiratory Journal.
- Johns Hopkins Bloomberg School of Public Health – diet rich in apples and tomatoes may help repair lungs of ex-smokers.
- European Respiratory Society – eating more fruits and tomatoes may slow lung function decline in ex-smokers.
- Acute ingestion of beetroot juice increases exhaled nitric oxide in healthy individuals – PMC.
- Physiological effects of beetroot in athletes and patients – PMC.
- Beetroot nitrate and phytochemical content in health and cardiovascular therapy – PMC.
- National Heart, Lung, and Blood Institute – lung health and protecting your lungs.
- American Lung Association – protecting your lung health.
- NIH Office of Dietary Supplements – Vitamin C fact sheet.
- NIH Office of Dietary Supplements – Vitamin A and carotenoids fact sheet.
- NIH Office of Dietary Supplements – Omega-3 fatty acids fact sheet.
- Centers for Disease Control and Prevention – smoking and COPD.
Medical disclaimer. This article is for informational and educational purposes only and is not medical advice. The foods described support general respiratory health and are not treatments for asthma, COPD, pulmonary fibrosis, respiratory infection or any other lung condition. Never stop or adjust prescribed respiratory medication based on dietary changes. New or worsening breathlessness, a cough lasting beyond three weeks, wheezing, or coughing up blood require prompt medical evaluation. Consult your physician or a registered dietitian before making significant dietary changes if you manage a chronic condition or take medication, particularly anticoagulants, which can interact with vitamin K in leafy greens.
Editorial note. Findings described from the ALEC and ECRHS research are observational and show association rather than proven causation. Where human evidence is limited, as with turmeric and ginger, we have said so rather than overstating it. Claims circulating online attributing large percentage reductions in airway inflammation to specific foods could not be verified in peer-reviewed sources and are not repeated here.