A list of “specific recommendations for the prevention of obesity by improving the circadian system health.” SAD doesn’t just stand for standard American diet. There’s a condition known as seasonal affective disorder that’s characterized by increased appetite and cravings, along with increased sleepiness and lethargy that begins in autumn, when light exposure starts to dwindle. This now appears to just represent the far end of a normal spectrum of a human behavior. We all appear to eat more as the days get shorter. There is a “marked seasonal rhythm” to calorie intake, with greater meal size, eating rate, hunger, and overall calorie intake in the fall….