Clinical trial NCT03362372: Effect of the Mediterranean Diet on Lung Function in Smokers Without Previous Respiratory Disease
Official title: MEDISTAR STUDY: Mediterranean Diet and Smoking in Tarragona and Reus
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Lung Diseases
Lead sponsor: Fundacio d'Investigacio en Atencio Primaria Jordi Gol i Gurina
Sponsor class: OTHER
Collaborators: name: Preventive Services and Health Promotion Research Network
First posted: 2017-12-05
Enrollment: 566
Sex: ALL
Minimum age (years): 25
Maximum age (years): 75
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: Controlled, parallel, multicenter, cluster-randomized clinical trial.
Primary purpose: PREVENTION

Brief summary: Several studies have shown the influence of the eating pattern on lung function. However, the benefits of the Mediterranean diet (DiMet) in preventing pulmonary dysfunction are not well known.

Objective: To evaluate the effect of adherence to DiMet on the deterioration of lung function in smokers.

Methodology: Design: Controlled, parallel, multicenter, cluster-randomized clinical trial. Participants: 566 active smokers with a cumulative consumption of more than 10 packets a year, within 25 to 75 year-old age group, without previous respiratory disease and who agree with the conditions of the study and sign an informed consent . Scope: 20 Primary Care Centers managed by the Catalan Health Institutes in Tarragona that will be randomly assigned to a control or an intervention group (1: 1). Intervention: During 2 years a nutritional intervention will be carried out to increase adherence to DiMet based on: 1) annual visit of personalized nutritional education, 2) annual telephone contact for intervention reinforcement, and 3) computer access to a dietary block designed ad hoc. The control group will follow their usual diet style. All participants will receive advice to quit smoking. It will be evaluated: a) pulmonary function by forced spirometry and b) adherence to the DiMet with a questionnaire of 14 items and biological determinations. Statistical analysis: For intention to treat. The unit of analysis will be the individual smoker. Parameters of pulmonary function and adherence to the DiMet of both groups will be compared.

Expected results: DiMet prevents the appearance of altered lung function in smokers without previous respiratory pathology. Thus, DiMet will be key in pulmonary prevention, together with the fundamental recommendation of smoking cessation.

Detailed description: Several studies have shown the influence of the eating pattern on lung function. However, the benefits of the Mediterranean diet (DiMet) in preventing pulmonary dysfunction are not well known.

Objective: To evaluate the effect of adherence to DiMet on the deterioration of lung function in smokers.

Methodology: Design: Controlled, parallel, multicenter, cluster-randomized clinical trial. Participants: 566 active smokers with a cumulative consumption of more than 10 packets a year, within 25 to 75 year-old age group, without previous respiratory disease and who agree with the conditions of the study and sign an informed consent . Scope: 20 Primary Care Centers managed by the Catalan Health Institutes in Tarragona that will be randomly assigned to a control or an intervention group (1: 1). Intervention: During 2 years a nutritional intervention will be carried out to increase adherence to DiMet based on: 1) annual visit of personalized nutritional education, 2) annual telephone contact for intervention reinforcement, and 3) computer access to a dietary block designed ad hoc. The control group will follow their usual diet style. All participants will receive advice to quit smoking. It will be evaluated: a) pulmonary function by forced spirometry and b) adherence to the DiMet with a questionnaire of 14 items and biological determinations. Statistical analysis: For intention to treat. The unit of analysis will be the individual smoker. Parameters of pulmonary function and adherence to the DiMet of both groups will be compared.

Expected results: DiMet prevents the appearance of altered lung function in smokers without previous respiratory pathology. Thus, DiMet will be key in pulmonary prevention, together with the fundamental recommendation of smoking cessation.

Eligibility criteria: Inclusion Criteria:

* Active smoking and cumulative consumption ≥10 pack-years.
* Age between 25-75 years.
* Internet connection.

Exclusion Criteria:

* History of respiratory disease.
* Chronic or terminal disorder that alters basal parameters.
* Any reason that limits follow up.

Primary outcomes:
measure: Change in lung function values in smokers without previous respiratory disease
timeFrame: 2 years
Secondary outcomes:
measure: Nutritional intervention
timeFrame: 2 years
measure: Nutritional intervention
timeFrame: 2 years
measure: Anthropometric parameters
timeFrame: 2 years
measure: Anthropometric parameters
timeFrame: 2 years
measure: Changes in food consumption markers
timeFrame: 2 years
measure: Changes in inflammation markers
timeFrame: 2 years
measure: Changes in inflammation markers
timeFrame: 2 years
Other outcomes:
Locations:
city: Barcelona
country: Spain
facility: Jordi Gol i Gurina Foundation
Study officials:
affiliation: Catalan Institute of Health
name: Francisco Martín Luján
role: PRINCIPAL_INVESTIGATOR
References:
citation: Martin-Lujan F, Catalin RE, Salamanca-Gonzalez P, Sorli-Aguilar M, Santigosa-Ayala A, Valls-Zamora RM, Martin-Vergara N, Canela-Armengol T, Arija-Val V, Sola-Alberich R. A clinical trial to evaluate the effect of the Mediterranean diet on smokers lung function. NPJ Prim Care Respir Med. 2019 Nov 27;29(1):40. doi: 10.1038/s41533-019-0153-7.
citation: Catalin RE, Martin-Lujan F, Salamanca-Gonzalez P, Palleja-Millan M, Villalobos F, Santigosa-Ayala A, Pedret A, Valls-Zamora RM, Sola R, On Behalf Of The Medistar Research Group Investigators. Mediterranean Diet and Lung Function in Adults Current Smokers: A Cross-Sectional Analysis in the MEDISTAR Project. Nutrients. 2023 Mar 3;15(5):1272. doi: 10.3390/nu15051272.