They open the shades
A flood of sunshine isn’t just an instant morning pick-me-up: A Northwestern University study found that people exposed to moderately bright light in the morning have significantly lower BMIs than people who get the majority of their light exposure later in the day. Independent of physical activity, sleep timing, caloric intake, age, or season, morning light exposure accounted for about 20 per cent of an individual’s BMI. Lack of sunlight can de-synchronize your internal body clock, altering metabolism and leading to weight gain. Just 20 to 30 minutes of morning light is enough to affect BMI and improve your health.