Tofu contains calcium and oxalic acid, the combination of the two will form calcium oxalate and thus lead to stones

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Tofu contains calcium and oxalic acid, the combination of the two will form calcium oxalate and thus lead to stones, so kidney stone patients should not eat tofu.
In soybeans, there are three main stone-related substances: purine, calcium and oxalic acid. Soybeans are processed in different ways, and the stone-related components will change, for example, soy milk and tofu contain very little purine.

The main effect of soy products on stones is the oxalic acid in them. Tofu (especially marinated tofu and gypsum tofu) has a very low content of oxalic acid, and food products further processed from tofu (e.g., dried tofu) do not have a high oxalic acid content, so they can be eaten by people with stones as well. Healthy people's bodies are more capable of processing oxalic acid and other ingredients, so there is even less need to worry about eating tofu or soy products causing stones.

In addition, contrary to popular belief, insufficient calcium intake in turn increases the risk of stones. Therefore, even for those who are at higher risk for stones, it is still necessary to consume the proper amount of calcium.


豆腐中含有钙和草酸，二者结合会形成草酸钙从而导致结石，因此肾结石患者不能吃豆腐。
在大豆中，与结石有关的物质主要有三种：嘌呤、钙和草酸。大豆经过不同的加工，其中与结石有关的成分会发生不同的变化，例如豆浆和豆腐中所含的嘌呤就很少。

豆制品对结石的影响主要是其中的草酸，而豆腐（尤其是卤水豆腐和石膏豆腐）中的草酸含量很低，从豆腐进一步加工而来的食品（比如豆腐干）草酸含量也不会高，所以结石病人也可以吃。健康人身体对于草酸等成分有更强的处理能力，就更没有必要担心吃豆腐或者豆制品引发结石了。

此外，与大家认识不同的是，钙摄入量不足反倒会增加结石风险。所以，即使是对结石风险较高的人群，依然需要摄入适当的钙。