Losing a little sleep every night may not seem like a big problem, but new research suggests that it could slowly affect your weight and overall health.
Many people stay up later to finish work, watch television, scroll through their phones, or deal with family responsibilities.
They may believe that missing an hour or so of sleep is harmless because they still manage to get through the day. However, scientists are finding more evidence that regular sleep is just as important as eating well and exercising.
Sleep gives the body time to repair itself, balance hormones, support the immune system, and help control hunger and energy use. When people do not get enough sleep, these natural processes may no longer work as well. Over time, this may increase the risk of obesity, type 2 diabetes, heart disease, and other health problems.
Researchers at Columbia University Irving Medical Center wanted to better understand how a modest loss of sleep affects adults who already have risk factors for heart and metabolic diseases. Their findings were published in the Annals of Internal Medicine.
The team combined the results of two carefully designed randomized crossover clinical trials involving 95 adults aged 20 years and older. All participants usually slept at least seven hours each night before entering the studies and already had cardiometabolic risk factors such as excess weight, high blood pressure, or other conditions linked with heart disease and diabetes.
During the research, each participant experienced two different six-week periods. In one period they continued their normal sleep routine. In the other period they reduced their sleep by about one and a half hours every night.
Researchers measured body weight, waist size, body composition, physical activity, and several biological markers linked with energy balance. The results showed that even this modest reduction in sleep was associated with small but meaningful changes.
Participants gained a little weight, their waist measurements increased slightly, and they spent more time sitting and being inactive compared with the period when they slept normally. Although the changes were not dramatic over six weeks, the researchers believe that if this pattern continued for months or years, it could gradually lead to obesity and increase the risk of serious diseases.
One possible explanation is that people who sleep less often feel more tired during the day, making them less likely to exercise or stay active. Lack of sleep may also change hormones that control hunger, causing people to eat more or choose high-calorie foods. In addition, staying awake longer creates more opportunities to snack.
The study reminds doctors that asking patients about sleep should become a routine part of healthcare visits. Weight management programs often focus on diet and exercise, but healthy sleep may deserve equal attention. The research also reminds individuals that improving sleep does not always require major changes.
Going to bed at a regular time, limiting caffeine late in the day, reducing screen use before bedtime, and creating a quiet sleeping environment may all help. The study has strengths because it used randomized crossover trials, allowing each participant to act as their own comparison.
However, the number of participants was relatively small and the study lasted only six weeks for each sleep condition. Larger and longer studies are still needed. Even so, the findings provide convincing evidence that losing only a small amount of sleep each night may slowly increase weight and reduce daily activity, especially in people already at risk for heart and metabolic disease.
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Source: Columbia University.
