Baking for winter holidays is a tradition that may have a sound medical basis. In midwinter, when days are short, many people suffer from a specific type of seasonal depression caused by lack of sunlight. Carbohydrates, both sugars and starches, boost the brain' s levels of serotonin, a neurotransmitter that improves the mood. In this respect, carbohydrates act on the brain in the same way as some antidepressants. Thus, eating holiday cookies may provide an effective form of self-prescribed medication. Which one of the following can be properly inferred from the passage? ['Lack of sunlight lowers the level of serotonin in the brain.', 'Seasonal depression is one of the most easily treated forms of depression.', "Some antidepressants act by changing the brain's level of serotonin.", 'People are more likely to be depressed in midwinter than at other times of the year.']