1 - Poor diet coupled with a lack of exercise, meaning that absorbs more energy than in spending, which logically leads to weight gain.
2 - Too many snacks (without following the usual meal time)
3 - A genetic origin, also called hereditary (due to improper metabolism of fats or sugars)
4 - A lack of physical activity, sedentary (couch potato).
5 - Stress: indeed, this state can promote weight gain, this process is linked to hormones released by stress (cortisol, epinephrine) that may influence on various processes of weight gain as the desire to eat.
6 - Poor diet: too rich in fat, sugar, such as a diet high in sugary drinks, fast food, pastries or in alcohol. Obesity is linked mainly to excessive consumption of sugars, including sugar pastes.
7 - Lack of sleep, nights of less than four hours of sleep. Indeed, little sleep may favor certain active agents in the brain that stimulate appetite or at least not prevent satiety (feeling of having no hunger), resulting in greater weight gain in these short sleepers.
8 - Taking certain medications in the long term (several months) such as antidepressants, antihistamines also exerting a sedative effect (ex. Based diphénidramine), corticosteroids (ex. Prednisone), progestins, the pill,...
9 - Problems with the thyroid gland, such as hypothyroidism.
