^* They migrate up under your ribcage, reducing your waistline in a way no diet can. One NASA researcher called it the Space Beauty Treatment. Without gravity, your hair has more body. Your breasts don’t sag. More of your body fluid migrates to your head and plumps your crow’s feet. Because blood volume sensors are in the upper body only, your system thinks you are retaining too much fluid and dumps 10 to 15 percent of your water weight. (Then again, I have also heard it called Puffy-Face Chicken-Leg Syndrome.)