The mechanism of coffee induced osteoporosis is mainly as follows.1. If patients drink a lot of coffee for a long time, it will lead to obstructed absorption of calcium from the food in the gastrointestinal tract. After drinking a lot of coffee, the relevant substances in the coffee and calcium will not be able to be absorbed by the formation of precipitation, which will lead to long-term patients are not able to take in enough calcium through the diet. 2. After the patient consumes coffee, the diuretic effect of coffee may lead to excessive electrolyte discharge from the body. And at this time, the patient is only able to make the bone breaking behavior increase within the bone, and then replenish the electrolytes inside the blood, which may cause the patient to develop osteoporosis due to this mechanism. Therefore, it is recommended that patients who like to drink coffee must control the amount of consumption, and it is best to drink coffee with milk to be able to reduce the related effects to a certain extent.