How does poor sleep affect your weight over time?

Poor sleep disrupts the hormones that regulate hunger, specifically increasing ghrelin (which stimulates appetite) and decreasing leptin (which signals fullness). This hormonal imbalance makes you feel hungrier than you actually are, particularly craving high-calorie, carbohydrate-rich foods. Sleep deprivation also impairs the prefrontal cortex, weakening impulse control and making it harder to resist unhealthy food choices. Over time, chronically poor sleep slows metabolism and increases cortisol levels, which promotes fat storage especially around the abdomen. Research consistently shows that people sleeping fewer than six hours per night have significantly higher rates of obesity. Sleep loss also reduces energy for physical activity and impairs muscle recovery, creating a compounding cycle that makes weight gain progressively harder to reverse.