Dietary Arachidonic Acid, Obesity and Atopic Respiratory Disease

Completed

• Conditions: Allergy; Obesity

• Registration Number: NCT02525354
• Lead Sponsor: University of New Hampshire

Brief Summary

Epidemiological studies have shown obesity to be a risk factor of asthma. Research evidence of obesity and atopic(ie. allergic)-related respiratory diseases, has been less clear. The purpose of the present study was to test the hypothesis that the relationship between obesity and atopic-related respiratory disease in premenopausal women is mediated by a dietary imbalance of omega 6 and 3 polyunsaturated fatty acids.

Detailed Description

Sixty young adult obese and non obese women, with, and without asthma, were studied using a cross-sectional design. Body composition was measured by plethysmography. A fasted blood sample was taken to measure: specific and total immunoglobulin (IgE) antibodies,biochemical markers of atopy; glucose and insulin to measure insulin sensitivity; estrogen(17β-estradiol) and sex hormone-binding globulin to measure estrogen status of the women; hormone-products of fat tissue ( leptin, adiponectin, resistin, tumor necrosis factor alpha (TNFα), interleukins (IL-6,IL-18), that have been associated with both obesity and immune processes involved in asthma and allergy. Dietary intake of omega 6: linoleic acid (LA), arachidonic acid(AA); and omega 3 fatty acids: α linolenic (ALA), eicosapentanoic (EPA) and docosahexanoic (DHA) and other nutrients were assessed by food frequency questionnaire.

Study Timeline

• Study Start: 2001-10
• Primary Completion: 2003-05
• Study Completion: 2003-05
• Study First Submitted: 2015-06-15
• Status Verified: 2015-07
• Study First Submitted QC: 2015-08-13
• Last Update Submitted: 2015-08-13
• Study First Posted: 2015-08-17
• Last Update Posted: 2015-08-17

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 60

Inclusion Criteria

• For asthmatics, only individuals that were willing and capable of not using asthma medications for two days prior to laboratory testing.

Exclusion Criteria

• An individual was excluded from the study if she had a history of high blood pressure, diabetes, heart disease, cigarette smoking, or eating disorders.
• Women that were pregnant or lactating.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Predictors of serum concentration of specific and total IgE antibodies in obesity	one day	Measures of insulin sensitivity, plasma concentrations of leptin, adiponectin, , estrogen, IL-18,and dietary arachidonic, eicosapentanoic, docosahexanoic fatty acids were entered as independent variables; and serum concentration of specific and total IgE antibodies as dependent variable, in a forward stepwise multivariate linear regression analysis to identify which factor(s) had the greatest influence on serum concentrations of IgE antibodies in obesity.

Secondary Outcome Measures

Name	Time	Method
Relationship between dietary levels of arachidonic, eicosapentanoic, docosahexanoic fatty acids and plasma concentration of leptin in obesity	one day	Dietary intake of the omega 6 and 3 fatty acids of were analyzed in relation to plasma concentration of leptin in obese and non obese women.
Correlation between dietary arachidonic, eicosapentanoic,and docoshexanoic fatty acids and plasma concentration of adiponectin in obesity	one day	Dietary intake of the omega 6 and 3 fatty acids of were analyzed in relation to plasma concentration of adiponectin in obese and non obese women.