Some people say that milk and tea can not drink tea with milk that combined with calcium in oxalic acid and calcium oxalate precipitation, l
Some people say that milk and tea can not drink tea with milk that combined with calcium in oxalic acid and calcium oxalate precipitation, long-term drinking will cause stones; and some people not to regard it as right, what is the truth?
First of all, we should understand what is oxalic acid, oxalic acid and the formation of stones
Oxalic acid is a metabolite of organisms in the human body, easy to form calcium oxalate can cause kidney stones and calcium oxalate, there are two main sources: 1, intestinal absorption of oxalate in food, namely Exogenous Oxalic acid; 2, the formation of oxalate metabolism, namely endogenous production of endogenous oxalic acid, oxalic acid mainly based on the following two forms: vitamin C directly into oxalic acid, accounting for about 40%; produced by glyoxylic acid metabolism, accounting for about 40-50%. Endogenous oxalic acid is very low in the body, most of the oxalic acid in our body comes from food.
Oxalic acid is a major component of urinary calcium oxalate stones, the urine calcium oxalate supersaturation degree of the influence of dozens of times larger than the calcium, so hyperoxaluria is an important risk factor of calcium oxalate, oxalate in ingested by human, if not combined with other materials, can be directly absorbed by the small intestine. The renal excretion (in the kidney) and calcium binding calcium oxalate stones.
Drinking milk and tea does not increase the risk of stone
Some people like to drink milk, especially at night, is conducive to sleep, the reason is that milk contains tryptophan; some people like to drink tea, because tea polyphenols have health effects. But the domestic research that tea is high oxalate foods, excessive drinking tea may lead to increased urinary oxalate excretion, urinary calcium concentration and high intake of oxalic acid is increased risk factors of gallstone formation therefore, some people think that more calcium milk and tea drinking from the same form of calcium oxalate crystals, which led to the formation of urinary calculi.
In fact, tea and milk intake and the risk did not increase the stone formation, under normal circumstances, oxalate excretion with urine outflow, affected by other factors related to the formation of stones, calcium oxalate stones, so whether oxalic acid in vivo combined with other substances, avoid into the kidney, is essential. Research shows that the amount of calcium, especially natural calcium substances (such as milk), can be combined with oxalic acid in the intestine, to avoid the formation of calcium oxalate, oxalate absorption in the gastrointestinal tract, reduce the content of oxalic acid in the body, thereby reducing the risk of gallstone formation. For example, patients with inflammatory bowel disease, may be changed by oxalate metabolism, resulting in increased intake of oxalic acid, prone to calcium oxalate kidney stones, the patients control lipids and dietary intake of oxalic acid, and calcium supplementation and probiotics can reduce the formation of stones, because the intestinal probiotics can degrade oxalic acid, and calcium can not form dissolution of calcium oxalate excreted thereby reducing intestinal absorption of oxalate and oxalic acid.
How to prevent the formation of calcium oxalate stone through diet?
Urolithiasis is a common disease of the urinary system, and cured tend to recur, calcium oxalate stone is one of the main components of urinary calculi, so to prevent the formation of calcium oxalate stone is very important how to through daily diet.
Diet for the prevention of calcium oxalate stone
1, liquid intake: a large amount of liquid intake, can increase the excretion of urinary oxalic acid, reduce the supersaturation of oxalic acid, the relevant research shows that the more the amount of urine, the lower the rate of recurrence of stones, it is recommended daily drinking water > 2L.
2, adequate intake of calcium: calcium intake in the gut and oxalic acid to form calcium oxalate complexes difficult to absorb, thereby reducing the body for the absorption of oxalic acid, foreign scholars Curhan had 91731 cases of 12 years of prospective follow-up survey, dietary calcium intake and the incidence of gallstone was negatively correlated with many at the same time drinking water, potassium, magnesium and phosphate etc..
3, the intake of cellulose: can reduce the absorption of oxalic acid in the gastrointestinal tract, gastrointestinal transit time is shortened, changes in the intestinal microenvironment, such as the role of calcium oxalate and reduce the secretion of uric acid, thus inhibiting the formation of stones;
4, limit the intake of oxalic acid: moderate consumption of oxalic acid rich foods, such as chocolate, spinach, sugar beet, etc., high intake of oxalic acid is the main cause of stone.
5, the amount of animal protein intake, excessive intake of protein and calcium oxalate can increase urinary excretion, secretion and reduce urinary citrate, reduced PH, easily lead to the formation of stones, especially for recurrent calcium oxalate stones and hyperoxaluria with white intake limit animal eggs. Adding normal intake of calcium, will have a good effect.
6, limit the intake of salt and sugar, high salt and sugar can cause increased urinary calcium, citrate secretion decreased, resulting in an increased incidence of gallstones.