Study Explains Link Between Academic Performance and Violence

A lack of variation in the stress hormone cortisol from morning to evening is tied to a wide range of negative health conditions, including inflammation and immune system dysfunction, new Northwestern University research suggests. In the first comprehensive review of the relationship between daily cortisol fluctuations and health, researchers at the School of Education and Social Policy combined data from 80 different studies to show that while cortisol levels matter, a lack of variation from morning to evening may be even more telling.