Cutting sleep by 90 minutes daily can lead to weight gain, study finds
A recent study published in the journal Annals of Internal Medicine reveals that reducing nightly sleep by just 90 minutes can lead to a gradual increase in weight. This research, conducted outside a laboratory setting, involved 95 participants who normally slept seven to eight hours per night. For six consecutive weeks, their sleep was reduced by 90 minutes daily.
The findings indicated that this mild sleep deprivation caused participants to gain an average of 450 grams (about one pound) over the six-week period. The reduced sleep led to increased fatigue, causing individuals to become more sedentary. On average, participants spent an additional 17 minutes sitting each day, with men and post-menopausal women exhibiting the most significant increases in sedentary time, accumulating an extra 30 minutes of sitting daily.
While a one-pound gain over six weeks may seem minor, experts warn that this effect, if sustained over months or years, could lead to substantial weight gain. Furthermore, insufficient sleep is linked to serious health risks, including type-2 diabetes and heart disease, particularly when combined with a sedentary lifestyle. The study's lead author, Mary-Pierre St-Onge, emphasizes that understanding the negative consequences of sleep deprivation should prompt individuals to prioritize adequate sleep for overall health and well-being.
This study highlights a critical public health issue: the chronic, low-level sleep deprivation common in modern society. By moving beyond traditional lab settings, the research provides a more realistic depiction of how daily sleep reduction impacts behavior and physiology. The observed weight gain, though seemingly small per week, demonstrates a compounding effect that, over time, can significantly contribute to obesity-related health problems like type-2 diabetes and cardiovascular disease. This underscores the importance of sleep not just for immediate alertness, but as a fundamental pillar of long-term metabolic health. Future public health initiatives could leverage these findings to promote sleep hygiene as a preventative health measure, recognizing its systemic impact on individual and population well-being in an increasingly demanding world.
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