Sleep and Weight Loss

Many of us do not even realize how much proper sleep duration and quality can affect a healthy body weight. It is almost as important as diet and exercise.

Here are seven reasons why you should pay attention to a good night's sleep if you want to get rid of excess weight. If you want to lose weight, perhaps it is worth considering the given recommendations?

Too little sleep duration

Too short sleep is one of the main risk factors for weight gain and obesity.

Many study results have shown that poor and short sleep has repeatedly been associated with a higher body mass index (BMI) and weight gain. Research has shown weight changes in people who slept less than seven hours per day.

Short sleep duration increases the likelihood of obesity by 89% in children and 55% in adults. Weight gain has also been observed in other experimental studies. A study conducted in Europe in 2018 examined the relationship between sleep duration and weight gain. Sixteen adult men and women were allowed to sleep only five hours per night for five nights. Over a short study period, they gained an average of about 0.82 kg.

Poor sleep can increase your appetite

Many studies have shown that sleep-deprived individuals tend to have an increased appetite. This is likely due to the effect of sleep on two key hunger hormones – ghrelin and leptin. Ghrelin is a hormone released in the stomach that signals hunger to the brain. Its levels are high before meals when the stomach is empty and decrease after eating. Leptin, on the other hand, is a hormone secreted by fat cells. It suppresses hunger and signals satiety to the brain.

When you don’t get enough sleep, your body produces more ghrelin and less leptin, making you feel hungrier and increasing your appetite.

Sleep helps control appetite and influences food choices

Sleep deprivation actually alters brain function. This makes it harder to choose healthy foods and resist tempting treats. After a sleepless night, a bowl of ice cream may feel like a well-deserved reward, making it harder to control cravings and opt for healthier options.

Studies have shown that a lack of sleep increases cravings for foods high in calories, carbohydrates, and fats.

Sleep Affects Caloric Intake

A study conducted by the University of Michigan observed 12 men. The study found that when participants were restricted to only four hours of sleep, they consumed an average of 559 more calories the following day compared to when they had eight hours of sleep. This is influenced not only by sleep duration but also by extended wakefulness—having more waking hours increases the likelihood of consuming more food.

Sleep Quality and Metabolism

Your resting metabolic rate (RMR) is the number of calories your body burns while at complete rest. It is influenced by factors such as age, weight, height, gender, and muscle mass. Research indicates that sleep deprivation can lower RMR.

In one study, 15 men were deprived of sleep for 24 hours. Their RMR decreased by 5% compared to after a full night’s rest, and their overall metabolic rate was 20% lower.

Sleep Enhances Physical Activity

Lack of sleep can cause daytime fatigue, reducing motivation and desire to exercise. Additionally, if sleep is insufficient, exhaustion can set in more quickly during physical activity.

A study involving 15 men found that those with sleep deprivation had lower physical activity levels and reduced workout intensity. Conversely, good sleep quality and duration have been shown to improve athletic performance.

Another study conducted in the U.S. aimed to enhance sports performance and efficiency. Basketball players were asked to sleep 10 hours per night for 5–7 weeks. Results showed improvements in speed, reaction time, accuracy, and reduced fatigue.

Sleep Helps Prevent Insulin Resistance

Poor sleep quality and insufficient sleep duration can lead to insulin resistance. Insulin is a hormone responsible for transporting sugar from the bloodstream into cells for energy. When cells become resistant to insulin, excess sugar remains in the blood, prompting the body to produce more insulin to compensate. High insulin levels increase hunger and encourage the body to store excess calories as fat. Insulin resistance is a major factor in type 2 diabetes and weight gain.

A European study on 20 men further confirmed this. Over six days, participants were restricted to only four hours of sleep per night. Post-experiment results showed a 40% reduction in their body's ability to regulate blood sugar levels.

Sleep and Muscle Growth

If you want to build muscle, going to bed before midnight is crucial. The endocrine system is closely linked to the circadian rhythm, and growth hormone production peaks before midnight.

To optimize muscle growth, it’s essential to sleep early, as the highest surge of growth hormone occurs around 11 PM, with a secondary, smaller peak at 2 AM.