Slightly low alkaline phosphatase can be caused by malnutrition, bone, kidney and other diseases. Alkaline phosphatase is an enzyme excreted by the liver to the gallbladder and can be found in tissues such as the liver, bones, intestines, kidneys, and placenta. The normal range for women is 50 to 135 U/L; for men it is 45 to 125 U/L. Slightly low alkaline phosphatase can be caused by severe chronic nephritis, thyroid disease in children, anemia, rickets, infections, etc. There is also a relationship with malnutrition. If there is a mild decrease in alkaline phosphatase, you need to go to the hospital for further examination of blood routine, liver and gallbladder ultrasound, thyroid function, thyroid ultrasound, kidney function, renal ultrasound, X-ray and other items to find the cause. It is also necessary to strengthen nutrition appropriately, eat less fried, barbecue and other greasy food, and eat more fresh fruits and vegetables.