Healthy Clinical Trial
Official title:
Influence of Coffee Consumption on BIA-derived Body Composition Parameters
Body composition analysis is frequently used in both clinical and research settings for evaluation of nutritional status and follow-up. Bioelectrical impedance analysis (BIA) is one method that has been extensively used to measure body composition. To ensure the reliability of BIA results, several recommendations are proposed in the literature. One of them is to avoid coffee and caffeine prior the test. This instruction is primarily based on the potential diuretic effects of caffeine however few studies evaluated the impact of coffee on fluid balance. Research participants usually have several commitments, especially those enrolled in clinical trials. Simplified and evidence-based instructions can avoid unnecessary restrictions and lead to better participant compliance.
Body composition analysis is frequently used in both clinical and research settings for
evaluation of nutritional status and follow-up. Using only anthropometric measures is
outdated considering the increasing transition towards an individualized treatment and the
recent advances in body composition assessment.
Methods to evaluate body composition in humans are chosen mostly based on compartment of
interest, study population and feasibility. Bioelectrical impedance analysis (BIA) is one
method that has been extensively used to measure body composition. This method uses an
impedance that can penetrates both intra- and extracellular fluids to estimate total body
water, fat-free mass and body fat.
To ensure the reliability of BIA results, several recommendations are proposed in the
literature. One of them is to avoid coffee and caffeine prior the test. This instruction is
primarily based on the potential diuretic effects of caffeine, which mechanisms are not
completely understood. However, few studies evaluated the impact of coffee or caffeine
(supplement) on fluid balance.
Coffee is a highly consumed beverage worldwide. Coffee is one of the most consumed beverage
among adults in Canada, and most of the caffeine consumed by adults comes from this beverage.
In addition, coffee bioactive compounds such as methylxanthines can influence BIA results due
its diuretic effect. Research participants usually have several commitments, especially those
enrolled in clinical trials. Simplified and evidence-based instructions can avoid unnecessary
restrictions and lead to better participant compliance. To the best of our knowledge the
current study is the first to explore the effect of coffee with two different amounts of
caffeine on BIA-derived body composition parameters.
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