From that second link: "Women are more likely than men to be diagnosed with SAD. Symptoms often begin when a woman is in her 20s and get progressively worse. Candidates for light therapy will lack energy, decrease their activity level, crave carbs and therefore gain weight. They'll have trouble getting up in the morning and experience difficulties socially, wanting to withdraw from activities, becoming irritable and possibly suffering from severe anxiety attacks and heart palpitations. Symptoms must be experience for two consecutive winters to fit the SAD profile."