can answer this one for ya. You need not even bother the guys at myth busters. I quit using shampoo many many moons ago. You see when most of your hair has fallen out and you buzz the rest there's really no need for shampoo anymore. However I can state that not using shampoo has no effect what so ever on weight. I continue to gain weight with ease. I must admit however, I'v not tryed bathing with dish detergent.
