Reacción a "Sleep deprivation is linked to weight gain in adults at cardiometabolic risk"

As a randomised clinical trial, this study provides a high level of evidence. Although it included fewer than 100 participants, it remains highly informative. Its randomised crossover design, strong adherence, and the use of complementary assessments (including actigraphy, MRI, and others) make it an outpatient study that closely reflects real-world conditions, more so than the classic laboratory experiments involving severe sleep restriction. It provides causal evidence that six weeks of mild but sustained sleep restriction (up to 1.5 hours less sleep per night) results in a modest yet clear increase in body weight (+0.45 kg), waist circumference, and sedentary time in adults at high cardiometabolic risk. The main limitations are the relatively short duration of the intervention (likely insufficient to detect clear changes in fat distribution versus lean mass), the small sample size for subgroup analyses by sex or menopausal status, and the fact that the study population already had an elevated cardiometabolic risk. Consequently, the findings cannot be directly extrapolated to healthy individuals without this underlying risk. It is plausible that the effect would be similar, or perhaps somewhat smaller, in metabolically healthy adults, but this remains uncertain. From a practical perspective, these findings support the inclusion of sleep as a modifiable factor in strategies aimed at preventing obesity and cardiometabolic disease. However, the observed effect is modest, and longer-term evidence is still needed. From a public health perspective, I find these results particularly concerning. People are sleeping less and less because of increasingly long working hours and today's sedentary lifestyles, both of which contribute to weight gain and make it more difficult to prevent and manage obesity and other chronic diseases.