NO.1 prevent overeating When eating out, it is easy to overeat. In order to control your own intake of calories, you can use the palm of your hand to measure. A quantity of meat or fish, the best is as large as your hand. The ideal size of dessert of a woman is about the size of the thumb. NO.2 maintaining metabolic health If your fingernails are more rough or cracking than usual, which may be symptoms of hyperthyroidism or decay, that means the body produces too much or too little hormone to regulate metabolism. Other symptoms of hyperthyroidism, including inability to concentrate, weight somehow becomes less, always feel heat and hunger. Typical symptoms are fatigue, joint and muscle pain, weight gain, and always feeling cold. If you have these symptoms, see your doctor. NO.3 make hair become thick Put fingers on the forehead hair line, from front to back combing your hair, and breath at the same. Repeat 10 times a day, it can stimulate hair follicle growth, so that they will be more straight thick and more smooth. NO.4 prevent colds and flu Hand is most likely to spread bacteria and make people sick. When you press the elevator button using the hand, when you grip door handles, bacteria will spread to the hands. This is why hand washing is the most easy way to prevent disease. Wash hands with soap and hot water for 20 seconds. NO.5 look younger Your hands can betray your true age. Even if you are 30 or 40 years old, your hands still have sunburn, drying, brown spots signs. To make your hands as young as before, let your hands and your face enjoy the same treatment. NO.6 prevent motion sickness When having long-distance travel in the car, press the inside of your wrist between the two tendonst (three fingers width under the palm) to help prevent motion sickness. NO.7 finger temperature is forecast to heart disease Recent study found that heart disease, before obvious symptoms appear, the signal appears in the fingers. Specific test method: use the blood pressure meter  wrap the arm, when blood pressure ges expansion, the blood flow to the hand will be less, finger temperature drops. After 5 minutes, loosen the blood pressure meter, the faster the finger temperature recovers, the more healthy endothelial cell layer is.