“Research found that even small amounts of tryptophan-rich egg protein influenced serotonin levels and significantly improved the moods of female participants aged 45 to 65,” Uma Naidoo, MD, a nutritional psychiatrist, says. For the best nutrient source, Naidoo recommends pasteurized eggs from cage-free chickens. Follow Bored Panda on Google News! Follow us on Flipboard.com/@boredpanda! Please use high-res photos without watermarks Ooops! Your image is too large, maximum file size is 8 MB.