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It is known that weight loss improves OSA, yet it remains unclear why continuous positive airway pressure (CPAP) often results in weight gain.<\/jats:p><jats:p>The goal of this systematic review is to explore if and how CPAP affects the behaviour and\/or metabolism involved in regulating energy balance.<\/jats:p><jats:p>CPAP appears to correct for a hormonal profile characterised by abnormally high leptin and ghrelin levels in OSA, by reducing the circulating levels of each. This is expected to reduce excess food intake. However, reliable measures of food intake are lacking, and not yet sufficient to make conclusions. Although studies are limited and inconsistent, CPAP may alter energy metabolism, with reports of reductions in resting metabolic rate or sleeping metabolic rate. CPAP appears to not have an appreciable effect on altering physical activity levels. More work is needed to characterise how CPAP affects energy balance regulation.<\/jats:p><jats:p>It is clear that promoting CPAP in conjunction with other weight loss approaches should be used to encourage optimal outcomes in OSA patients.<\/jats:p>","DOI":"10.1183\/13993003.00689-2016","type":"journal-article","created":{"date-parts":[[2016,10,21]],"date-time":"2016-10-21T01:58:32Z","timestamp":1477015112000},"page":"1640-1657","update-policy":"https:\/\/doi.org\/10.1183\/ers-crossmark-policy","source":"Crossref","is-referenced-by-count":36,"title":["Effects of continuous positive airway pressure on energy balance regulation: a systematic 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