1. Caloric imbalance
The fundamental cause of obesity is a structural imbalance between energy intake and energy expenditure: you eat more calories than your body burns daily. In modern diets, energy-dense, processed foods, and sugary drinks are the primary cause of this imbalance.
2. Poor food choices
High consumption of fast food, processed foods, and high-calorie snacks often leads to excessive total calorie intake. These foods are not only high in fat and sugar, but also designed to "reward" your brain, making it easy to overeat.
3. Sedentary lifestyle
Too much sitting and screen time at home, at work, or on the go comes at the expense of exercise. Those who combine insufficient physical activity with a high-calorie diet gradually build up fat mass.
4. Genetic predisposition
Research has identified more than four hundred genes that can increase the risk of obesity by affecting appetite, satiety, and metabolism. In some people, this genetic predisposition makes them gain weight more quickly, even with a similar lifestyle.
5. Emotional and stress-related eating
Stress, unresolved trauma, or negative emotions often activate your "comfort eating system." Cortisol, the stress hormone, increases your cravings for high-calorie foods and reinforces the habit of eating out of emotion rather than true hunger.
6. Poor sleep and hormonal disruption
Chronic sleep deprivation disrupts the balance of hunger and satiety hormones (such as ghrelin and leptin). Those who don't get enough sleep experience increased cravings and often automatically eat more, resulting in weight gain.
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