Because spatial ability is usually better in men with lower testosterone levels, Kimura predicted correctly that men would be better at spatial tasks in spring than in autumn. This changed firing rates higher in the brain. Hormones could affect the speed and quality of human thinking, motion and speech. Estrogen and Appetite Eating disorders like anorexia and bulimia nervosa and binge eating are regular killers of women in particular, but researchers don't know much about their cause or why women are so vulnerable. Part of the problem, according to Nori Geary, Ph.D., associate research professor in the Department of Psychiatry at Cornell University Medical College-New York, is that researchers don't understand the biological basis of normal eating well enough to develop effective treatments for the disorders.
Human research suggests women's food intake varies during the menstrual cycle.
The clearest change is reduced total daily food intake during the periovulatory period. Another study found food intake was much lower during ovulation. Whether the cravings relate to increases in total food intake or to macronutrient selection has not been established. Growing evidence shows estradiol may reduce meal size by strengthening the satiating actions of some gut peptides, especially cholecystokinin. Several lines of investigation are starting to show how estradiol inhibits eating in rats.