A study from the Johns Hopkins Bloomberg School of Public Health found the natural decline in lung function over a 10-year period was slower among former smokers with a diet high in tomatoes and fruits, especially apples, suggesting certain components in these foods might help restore lung damage caused by smoking.
The researchers found that adults who on average ate more than two tomatoes or more than three portions of fresh fruit a day had a slower decline in lung function compared to those who ate less than one tomato or less than one portion of fruit a day, respectively. The researchers inquired about other dietary sources such as dishes and processed foods containing fruits and vegetables (tomato sauce) but the protective effect was only observed in fresh fruit and vegetables.
The paper, which is part of the Ageing Lungs in European Cohorts (ALEC) Study, funded by the European Commission and led by Imperial College London, also found a slower decline in lung function among all adults, including those who had never smoked or had stopped smoking, with the highest tomato consumption. Poor lung function has been linked with mortality risks from all diseases, including chronic obstructive pulmonary disease (COPD), heart disease, and lung cancer.
“This study shows that diet might help repair lung damage in people who have stopped smoking. It also suggests that a diet rich in fruits can slow down the lung’s natural aging process even if you have never smoked,” says Vanessa Garcia-Larsen, assistant professor in the Bloomberg School’s department of international health and the study’s lead author. “The findings support the need for dietary recommendations, especially for people at risk of developing respiratory diseases such as COPD.”
For the study, the research team assessed diet and lung function of more than 650 adults in 2002, and then repeated lung function tests on the same group of participants 10 years later. Participants from three European countries – Germany, Norway and the UK – completed questionnaires assessing their diets and overall nutritional intake. They also underwent spirometry, a procedure that measures the capacity of lungs to take in oxygen.
The test collects two standard measurements of lung function: Forced Exhaled Volume in one second (FEV1), which measures how much air a person can expel from their lungs in one second; and Forced Vital Capacity (FVC), the total amount of air a person can inhale in six seconds. The study controlled for factors such as age, height, sex, body mass index (an indicator of obesity), socio-economic status, physical activity and total energy intake.
Among former smokers, the diet-lung-function connection was even more striking. Ex-smokers who ate a diet high in tomatoes and fruits had around 80 ml slower decline over the 10-year period. This suggests that nutrients in their diets are helping to repair damage done by smoking.
“Lung function starts to decline at around age 30 at variable speed depending on the general and specific health of individuals,” explains Garcia-Larsen “Our study suggests that eating more fruits on a regular basis can help attenuate the decline as people age, and might even help repair damage caused by smoking. Diet could become one way of combating rising diagnosis of COPD around the world.”
The relationship between lung function decline and dietary antioxidants over 10 years in adults from three European countries was investigated.
In 2002, adults from three participating countries of the European Community Respiratory Health Survey (ECRHS) answered a questionnaire and underwent spirometry (forced expiratory volume in 1 s (FEV1) and forced vital capacity (FVC)), which were repeated 10 years later. Dietary intake was estimated at baseline with food frequency questionnaires (FFQ). Associations between annual lung function decline (mL) and diet (tertiles) were examined with multivariable analyses. Simes’ procedure was applied to control for multiple testing.
A total of 680 individuals (baseline mean age 43.8±6.6 years) were included. A per-tertile increase in apple and banana intake was associated with a 3.59 mL·year−1 (95% CI 0.40, 7.68) and 3.69 mL·year−1 (95% CI 0.25, 7.14) slower decline in FEV1 and FVC, respectively. Tomato intake was also associated with a slower decline in FVC (4.5 mL·year−1; 95% CI 1.28, 8.02). Only the association with tomato intake remained statistically significant after the Simes’ procedure was performed. Subgroup analyses showed that apple, banana and tomato intake were all associated with a slower decline in FVC in ex-smokers.
Intake of fruits and tomatoes might delay lung function decline in adults, particularly in ex-smokers.
Vanessa Garcia-Larsen, James F Potts, Ernst Omenaas, Joachim Heinrich, Cecilie Svanes, Judith Garcia-Aymerich, Peter G Burney, and Deborah L Jarvis