Dr. Stacy Sims, the scientist behind Osmo Nutrition has a phrase that every woman should listen to and take to heart. "Women are not small men." Now, to allay any fears that this means women will never train as hard or be as fast as men, she isn't referring to their potential as athletes. Dr. Sims is referring to, specifically, a woman's physiology. She developed Osmo Active Hydration for women to rebalance physiological differences and help women obtain and maintain peak performance, no matter what the day of the month is. Although her phrase seems blatantly obvious, for years sports nutrition manufacturers have been treating women as just that - small men. Sure they've reduced calories in drinks, added soy protein, and packaged them in pretty pink boxes, maybe added a bit of calcium. But, there has been no move to reformulate from a science-based standpoint. Sims, an elite athlete and specialist in how hormones affect the body's performance, set out to develop a series of hydration and recovery products that directly address the female athlete's needs. What's the one thing that affects a woman more than anything? The menstrual cycle. Basically, Sims describes the hormonal flux as occurring in two phases: During the two weeks when the body is at low hormones, women are physiologically similar to men in both metabolism and carbohydrate uptake. During the two weeks of high hormones, however, there are significant differences. High estrogen forces a woman's body to spare glycogen and increases the amount of fat used for fuel. And while this may sound like a good thing - who doesn't want to lose a few pounds -if you are racing or doing zone 5 intervals, this can have devastating effects. Additionally, high progesterone delays sweat response and increases core temperature, increases sodium loss and increases muscle breakdown. The combination of these hormones decreases blood plasma volume which can make efforts feel harder than they are. Osmo Nutrition'.