Study Reveals Mild Sleep Reduction Can Increase Diabetes Risk in Women

A recent study conducted at Columbia University highlights the impact of a modest sleep deficit on insulin resistance, particularly in women accustomed to sufficient sleep. The research, led by Marie-Pierre St-Onge, and published in Diabetes Care, demonstrates that a mere 90-minute reduction in nightly sleep over six weeks can lead to elevated insulin resistance, with postmenopausal women experiencing a more pronounced effect.

Despite the recommended seven to nine hours of sleep per night for optimal health, approximately one-third of Americans fall short of this guideline. This study is the first to reveal that a mild sleep deficit, sustained over six weeks, can heighten the risk of diabetes in women. Prior trials focused mainly on men and severe sleep restriction over short durations.

The study concentrated on women due to indications that poor sleep may have a more substantial impact on their cardiometabolic health than on men. Dr. St-Onge emphasizes the unique challenges women face throughout their lives, such as changes in sleep patterns during childbearing, child-rearing, and menopause.

Examining the health consequences of chronic sleep loss, the researchers enrolled 38 healthy women, including 11 postmenopausal participants, who typically slept at least seven hours per night. Participants underwent two six-week study phases, alternately maintaining adequate sleep and reducing sleep by 90 minutes. Wearable devices tracked sleep schedules, while insulin, glucose, and body fat levels were measured.

Results indicated that the sleep reduction led to a 12% increase in fasting insulin levels and nearly 15% higher insulin resistance overall, with postmenopausal women experiencing a 20% rise. Interestingly, these effects were independent of changes in body fat, a known risk factor for type 2 diabetes.

Dr. St-Onge emphasizes the potential long-term consequences, suggesting ongoing stress on insulin-producing cells could lead to type 2 diabetes. The study underscores the importance of sufficient sleep for better blood sugar control and reduced diabetes risk, especially among postmenopausal women. Future research will explore stabilizing sleep patterns and restoring sleep to improve glucose metabolism in those at risk of diabetes.