A study presented at the European Congress on Obesity (ECO) in Liverpool has found that drinking distilled water has virtually no effect on resting energy expenditure, while mineral water has only a very small effect. The research is by Nathalie Charrière and Professor Abdul Dulloo at the University of Fribourg, Switzerland, and colleagues.
Drinking large amounts of water is often recommended for weight control -a notion which is supported by reports (see references 1-4 below) that drinking 500 ml of water increases resting energy expenditure (REE) by up to 30% during the 30-90min post-ingestion. “These findings are, however, inconsistent with other human studies (see reference 5) reporting no significant thermogenic response to similar, or even greater water load,” say Charrière and Dulloo. “One explanation for these conflicting results may reside in the fact that studies reporting ‘water-induced thermogenesis’ utilise tap water or bottled mineral water, both of which contain ingredients (minerals, salts, pollutants, etc) which may be contributing to the thermogenic effects of water.”
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