Middle-aged and elderly patients choose calcium carbonate to prevent and treat osteoporosis. The proportion of elemental calcium in calcium carbonate is relatively high, accounting for 40%. Appropriate calcium carbonate supplementation in this way can meet the needs of middle-aged and elderly people for calcium. Calcium carbonate needs gastric acid dissociation, so it is recommended to eat calcium carbonate immediately with or after meals. There is a lot of stomach acid after meals, which helps food digestion. At the same time, it can help calcium carbonate to dissociate and absorb better, and at the same time, it can also reduce the stimulation to gastrointestinal tract.

If middle-aged and elderly people need calcium supplement, but they also have gastric acid deficiency, even if they use drugs to inhibit gastric acid to treat gastrointestinal diseases, and even middle-aged and elderly people with urinary calculi need calcium supplement, it is recommended to choose calcium citrate, also known as calcium citrate, which does not require free gastric acid and does not increase urinary calcium. Therefore, if middle-aged and elderly people have stomach acid deficiency and urinary calculi and need calcium supplementation, choose calcium citrate and take it before meals, which will not increase urinary calculi.

Because the absorption capacity of various calcium agents in gastrointestinal tract is limited, it is better not to eat them all at once, but to eat them in 2-3 times. At the same time, the absorption of calcium needs vitamin D. The best way to supplement vitamin D is not to eat certain foods, but to strengthen outdoor sun exposure. Ultraviolet rays in the sun can better synthesize vitamin D and help us absorb calcium better. Middle-aged and elderly people need not only calcium tablets, but also a diet rich in calcium, such as various dairy products, fresh vegetables, fruits, meat, eggs and milk, neither less nor more.