Why do you crave sweets in winter and how not to eat stress Short daylight hours and lack of vitamin D in winter reduce serotonin production. Sweets temporarily improve your mood, so the habit of "eating" fatigue and stress is easily established. To stay fuller, endocrinologists advise: eat regularly - at least three times a day including proteins, slow carbohydrates, healthy fats and vegetables with fiber replace sweets with fruits and berries move more and walk in the fresh air physical activity helps produce endorphins and improves mood. VK Instagram TikTok.