Why do we get fat in winter?

A handful of people develop Seasonal Affective Disorder (SAD) in the winter, which is a type of clinical depression. The holiday season brings with it an influx of parties and gatherings that are fueled by tons of drinking and eating. It sounds fun at the get-go—but by New Year’s, you’ve probably gotten a little too used to that sluggish feeling that sets in post-holiday binge eating.