"with spinach and tofu should not eat", and many people believe that. This taboo what is the justification? Basic theory that there is only one: many spinach contains oxalic acid, while the ordinary bean is gypsum or brine point, contains a lot of calcium, oxalate may combine with calcium to form insoluble precipitates.
Well, what harm has it be? Has two popular argument: (1) waste of tofu calcium; (2) oxalic acid and calcium-binding, will lead to kidney stones.
There is no doubt that oxalic acid and calcium-binding precipitation, it will certainly waste a part of calcium. Indeed there is the elderly friends that ate spinach tofu to go to the hospital after tests found that the oxalate crystallization in urine increased.
Yet another aspect of the problem is: If you do not eat tofu, spinach in the absorption of oxalate is not it? Absorption, it will not affect the calcium use it to promote the formation of stones么? If you worry about oxalic acid, are not not eat the spinach? Well, diet rich in oxalic acid have a lot of other vegetables, such as bamboo shoots, water spinach, edible fungus vegetables, amaranth, Swiss chard, wild rice stem, Leek and so on, same potential increase in oxalate. They are not not eat it?
Moreover, these food inside the can and now that the oxalic acid calcium-binding, is it all and should not eat soy products? Other calcium-rich foods are not and should not eat them, such as sesame, milk, dried small shrimps, seafood, nuts, and so on?
want analysis of these questions can be considered from four aspects.
Firstly, whether or not to remove the oxalic acid? No oxalic acid, all questions will be solved. Spinach tofu will cause trouble, first of all depends on how the dish is done. If there was no spinach in boiling water before cheuk directly with fried bean curd together, indeed there is the possibility of increased oxalate absorption. The experiments show that after eating cheuk water spinach, spinach speculation than direct urinary oxalate increased the range of small. Cheuk water want a little more water, some of Li Shui fully in order to fully remove the oxalic acid. Fried tofu first, then add cheuk water spinach, is increased by several times under出锅, you can reduce the oxalic acid at a large extent, the trouble and keep the delicious spinach tofu.
Secondly, look at the day's total intake of oxalic acid. If spinach Although cheuk, but apart from eating spinach, but also ate other vegetables contain a high level of oxalic acid, add together, may still be brought about by excessive oxalate problem, increase the oxalate content in urine.
Third, watch the body's digestion and absorption of functional status and acid-base balance status. Intestinal dysfunction will increase the body's absorption of oxalate intake, and physical偏酸will also promote the formation of oxalate crystallization. Studies have shown that animal protein is not vegetarian, although higher levels of oxalate, but stone vegan but the risk is low; eating too much meat, refined white rice noodle and sugary foods will tend to promote the body acidic, thereby increasing stones dangerous.
Fourth, oxalate-rich vegetables and tofu to eat together, will increase the risk of stones. Investigate the medical profession in our country have proven that the calcium intake of more beneficial to the prevention of kidney and urethral stones generated, that is to say, ate spinach, if do not eat calcium-rich soy products, far more dangerous stones. American experts have even suggested that it would put high calcium oxalate food and eat food together to promote the oxalic acid in the intestinal tract will form a precipitate and avoid substantial absorption by the body.
in fact, rich in calcium and protein in tofu, combined with vitamin K, potassium and magnesium cheuk water spinach, calcium is the bone of match!
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