In ultra-orthodox communities that practice arranged marriage, a confidential registry was established that allows matchmakers to avoid arranging marriages between carriers of Tay-Sachs and several other debilitatingconditions.

a mother eats twice as much to support her growing fetus

limiting sugar intake in a mother with gestational diabetes, switching from diving to swimming.   depending on whether the patient is normal weight, over weight or gain will differ depending on that.

football or basketball players.

perspiration and respiration.