Özet:

Introduction: The prevalence of asthma has been increasing in recent years throughout the world. Capsaicin, catechines and caffeine may stimulate the sympathetic nervous system and promote satiety, lipolysis and thermogenesis. Objective: The objective of the study was to assess the evidencefrom rigorous clinical trials and meta-analyses on the effectiveness of dietary supplements in energy expenditure.Materials and Methods: The study was a systematic review. Literature searches were conducted on PubMed, until May 2012. Hand searches of medical journals, the authors’ own files, and bibliographies of identified articles were conducted. The screening of studies, selection, validation, data extraction, and the assessment of methodologic quality were performed independently by 2 reviewers. To beincluded, trials were required to be randomized and double-blind. Results: One meta-analysis and 9 additional trials were included and reviewed. Data on the following dietary supplements were identified: “weight loss”, “capsaicin”, “green tea”, “catequin”, “caffeine” and “thermogenesis”. The reviewed studies provide some encouraging data but no evidence beyond a reasonable doubt than any specific dietary supplements is effective for increasing energy expenditure and reducing body weight. Conclusions: The evidence for most dietary supplements as aids in increasing energy expenditure and in reducing body weight is not convincing.

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