Tofu Consumption for People with Kidney Stones – What You Need to Know

Many people wonder whether those with kidney stones can safely eat tofu. The good news is that individuals with kidney stones generally can include tofu in their diet. This is especially true for varieties like brined tofu or gypsum tofu, which are naturally low in oxalate content. Oxalates are compounds that can contribute to the formation of certain types of kidney stones.

Processed tofu products like tofu skin or dried tofu also contain minimal oxalates, making them relatively safe options for those managing kidney stones. One reason tofu is considered a better choice is that during its production, soybeans are soaked and diluted with water, which significantly reduces their purine content. Purines are substances that can increase uric acid levels, another contributor to stone formation.

Moreover, tofu is rich in calcium, which plays a beneficial role in reducing kidney stone risk. Calcium in food binds with oxalate in the digestive tract, preventing it from being absorbed into the bloodstream and eventually excreted in urine. This process helps reduce the likelihood of stone formation.

For those with existing kidney stones, it's more important to focus on hydration and overall dietary habits than to avoid tofu altogether. Drinking plenty of water daily, consuming moderate amounts of high-quality protein such as eggs, lean meats, and dairy, and limiting salt intake are more critical steps. It's also wise to reduce consumption of high-oxalate foods like spinach, asparagus, peanuts, and cocoa powder.

Healthy individuals have even less reason to avoid tofu or soy products due to kidney stone concerns. And for people with other types of stones—such as uric acid or struvite stones—dietary restrictions are usually not as strict, and tofu can typically be enjoyed without concern.