More exercise is unlikely to lead to more weight loss. When you're sleep deprived, your body is unable to properly metabolise carbohydrates. This causes insulin production to increase, which means your body stores more fat. Cortisol, the stress hormone associated with fat gain, rises and levels of the hunger hormone ghrelin also increase. This activates the areas of your brain that make you want food, and shuts down the ones that make you feel full, leaving you hungry all the time.
Al-Hazzaa et al. concluded that 84% of male and 91.2% of female Saudi adolescents spent >2 h daily on screen, and ~50% of boys and ~75% of girls did not meet daily physical activity guidelines 5. The majority of adolescents did not have a daily intake of breakfast, fruit, vegetables and milk. Compared with boys, girls were significantly more sedentary, much less physically active, especially for vigorous physical activity, and there were fewer days per week when they consumed breakfast, fruit, milk and dairy products, sugar-sweetened drinks, fast foods, and energy drinks. However, girls' intake of French fries and potato chips, cakes and doughnuts, and candy and chocolate was significantly higher. There was a significant inverse correlation between screen time and intake of breakfast, vegetables and fruit. Conversely, physical activity had a significant positive relationship with fruit and vegetable intake.
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