Make hay while the sun shines, winters may be dull

Ever wondered why you feel energetic and lively on bright sunny days and lackluster during the dark winter season? Well, researchers from University of Toronto, Ontario, Canada have got the answer for you. The research team has identified the mechanism underlying seasonal mood changes. With the help of PET scans, the researchers have shown that the actions of the serotonin transporter-involved in regulating the mood-altering neurotransmitter serotonin-vary by season.