The results of the Predimed-Plus research groups, published in the International Journal of Obesity which evaluated the effect of an intensive weight-loss intervention by studying the changes in weight and body fat of the 1.986 participating individuals — who were overweight, obese and with metabolic syndrome — over the course of a year. The results showed that getting too little sleep (fewer than 6 hours a day) and having inconsistent sleep patterns were associated with a lower decrease in body mass index (BMI) and waist circumference, respectively.  

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