More Research Needed on Diet and Environmental Influences on Childhood Asthma

According to New Studies in the Journal of the American Dietetic Association

St. Louis, MO, January 24, 2011 – Asthma is one of the world's most common chronic diseases, affecting as many as 300 million people. It is estimated that by 2025 there could be an additional 100 million people with the disease. This rapid increase in asthma is most likely due to changing environmental or lifestyle factors, and over the last 15 years, changing diet has emerged as a promising contributor. Two studies published in the in the February 2011 issue of the Journal of the American Dietetic Association explore the possible relationship between nutrition and asthma. Researchers review the rationale for investigating associations between diet and asthma, discuss the potential for dietary intervention to complement conventional asthma treatment, and summarize the recent data suggesting that diet may influence the development of asthma.

Investigators from the University of Aberdeen, UK, review three dietary factors that have been hypothesized to explain the increase in asthma – a changing antioxidant intake, an increasing ratio of n-6 to n-3 polyunsaturated fatty acid (PUFA) consumption and changing vitamin D status. Although there is insufficient clinical evidence for the use of nutritional supplements to complement conventional asthma treatments, the authors note that ongoing studies may change this picture. They also review a small number of studies of maternal diet during pregnancy that suggest that dietary modification during pregnancy might reduce the incidence of childhood asthma.

According to Graham Devereux, MD, PhD, “The generally weak observational and very limited intervention data suggest that whilst there are associations between diet and asthma, the nature of the associations (with PUFA, antioxidants, nutrients, food), the timing (antenatal, infancy, childhood, adulthood), and the therapeutic potential of the associations are far from clear.” He continues, "Future studies should consider the use of dietary intervention to increase the intake of nutrients highlighted by birth cohorts (vitamin E, PUFA, vitamin D, zinc) in order to capture the complexity of dietary nutrient intake. If shown to be efficacious, such a dietary intervention could be the basis for a low cost, safe public health intervention to rapidly reduce the prevalence of asthma in children and ultimately adults, with obvious beneficial consequences for the wellbeing of individuals and society as a whole.Until the results of ongoing and planned trials are available, the practical consequences of research linking diet with asthma are minimal, and based on the available evidence, people with asthma, pregnant women, parents, and children should not be advised to change or supplement their diet in order to treat or reduce the risk of developing asthma."

In a study published in the same issue a multi-institutional team of researchers in Greece examined associations between salty snack consumption and TV or video game viewing and asthma symptoms in young adolescents. While noting that although both factors have been implicated in asthma development, results have been conflicting. In their cross-sectional study of 700 children 10-12 years old, living in and around Athens, Greece, they found that there was a 4.8 times higher risk of having asthma symptoms when salty snacks were consumed more than 3 times per week. This association was even more prominent in children who watch TV or play video games more than 2 hours per day.

The authors also found that children who consumed a "Mediterranean diet" were less likely to have asthma symptoms, consistent with previous studies evaluating the association between the Mediterranean diet and asthma in children. The Mediterranean diet has a high content of vegetables, fresh fruits, cereals and olive oil, with a high intake of beta-carotene, vitamins C and E and various important protective substances like selenium, flavonoids and polyphenols with marked antioxidant activity.

Lead investigators Demosthenes Panagiotakos, PhD, Associate Professor, Department of Nutrition – Dietetics, Harokopio University, and Kostas Priftis, MD, PhD, Assistant Professor, School of Medicine, University of Athens, Greece, conclude, "Since the prevalence of asthma is quite high in industrialized populations, and has continued to increase during the past years, future interventions and public health messages should be focused on changing these behaviors from the early stages of life, by informing parents, guardians, teachers and any other person that could teach children a healthier lifestyle."

“Diet and asthma: Nutritional implications from prevention to treatment” by Keith Allan, MSc, and Graham Devereux, MD, PhD

"Salty-snack eating, television or video-game viewing, and asthma symptoms among 10- to 12-year- old children: The PANACEA study" by Fotini Arvaniti, RD, MSc, Kostas N. Priftis, MD, PhD, Anastasios Papadimitriou, MD, PhD, Panagiotis Yiallouros, MD, Maria Kapsokefalou, PhD, Michael B. Anthracopoulos, MD, PhD, and Demosthenes B. Panagiotakos, MD, PhD

Both appear in the Journal of the American Dietetic Association, Volume 111 Issue 2 (February 2011) published by Elsevier.

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Notes for Editors 
Full text of this article is available to journalists upon request. Contact Nancy Burns at 314-447-8013 or adajmedia@elsevier.comto obtain copies.
For interviews please contact:

Graham Devereux, MD, PhD
University of Aberdeen
Tel: +44 1224 552471

Demosthenes B. Panagiotakos, PhD 
Associate Professor in Biostatistics-Epidemiology of Nutrition
Harokopio University of Athens
Tel +30210 95 49 332

About the Authors
"Diet and asthma: nutritional implications from prevention to treatment"

Keith Allan MSc
Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, Scotland

Graham Devereux MD, PhD
Royal Aberdeen Children’s Hospital, Department of Child Health, University of Aberdeen, Aberdeen, Scotland

"Salty snacks eating, TV or video games viewing and asthma symptoms among 10-12 years old children: The PANACEA study"

Fotini Arvaniti, RD, MSc
Unit of Human Nutrition, Department of Food Science and Technology, Agricultural University of Athens, Athens, Greece

Kostas N. Priftis, MD, PhD
Department of Allergy-Pneumonology, Penteli Children’s Hospital, Penteli, Greece

Anastasios Papadimitriou, MD, PhD
Third Department of Pediatrics, Attikon Hospital, Athens University Medical
School, Athens, Greece

Panayiotis Yiallouros, MD
Cyprus International Institute for the Environment and Public Health, Nicosia,

Maria Kapsokefalou, PhD
Unit of Human Nutrition, Department of Food Science and Technology, Agricultural University of Athens, Athens, Greece

Michael B. Anthracopoulos, MD, PhD
Respiratory Unit, Department of Paediatrics, University Hospital of Patras, Greece

Demosthenes B. Panagiotakos, MD, PhD
Department of Nutrition – Dietetics, Harokopio University, Athens, Greece

About The Journal of the American Dietetic Association 
The official journal of the American Dietetic Association ( the Journal of the American Dietetic Association ( is the premier source for the practice and science of food, nutrition and dietetics. The monthly, peer-reviewed journal presents original articles prepared by scholars and practitioners and is the most widely read professional publication in the field. The Journal focuses on advancing professional knowledge across the range of research and practice issues such as: nutritional science, medical nutrition therapy, public health nutrition, food science and biotechnology, food service systems, leadership and management and dietetics education.

The Journal has been ranked 16th of 66 journals in Impact Factor in the Nutrition and Dietetics category of the Journal Citation Reports® 2009, published by Thomson Reuters in 2010, with an Impact Factor of 3.128.

About The American Dietetic Association 
The American Dietetic Association ( is the world’s largest organization of food and nutrition professionals. ADA is committed to improving the nation’s health and advancing the profession of dietetics through research, education and advocacy.

About Elsevier
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Media Contacts 
Nancy Burns
Tel: +1 314-447-8013

Ryan O’Malley
American Dietetic Association
Tel: +1 800-877-1600, ext. 4769