When PMS hits in Week 4 of your cycle, do you get hit with intense cravings for a big bag of chocolate M&Ms, a heaping bowl of salt and vinegar potato chips, or a combination of salty and chocolate snacks? New research reveals the reason: Two seperate studies—one from the University of Iowa, the other from the University of California, San Diego—show that chocolate and salt (eaten alone or together) activate pleasure mechanisms in the brain that chase away depression, a common problem women face during their premenstrual week as estrogen and testosterone plunge.

Trying to watch your waistline? Research shows that exercising, shopping, doing your favorite hobbies and spending time with uplifting friends also boost mood-lifting brain chemicals and distract you when cravings hit so you’re less likely to indulge.