How do you prevent leg varices?

Choose different ... Grandparents. Unfortunately, your only real way to prevent varices is to change your heredity. At least 80% of the reason why people get varicose veins in because they inherit the tendency. So if your parents have varicose veins, you are pretty well stuck. Wearing compression stockings, avoiding prolonged standing, and exercise helps, but if you have varices, treat them.