Problem description:

Is eating shallots mixed with tofu harmful to your health?

Analysis:

Yes, because tofu is rich in nutrients such as protein and calcium, while onion contains a lot of oxalic acid. When tofu is mixed with onion, calcium in tofu combines with oxalic acid in onion to form white precipitate calcium oxalate, which destroys the calcium in tofu. Calcium oxalate is hard to be absorbed by human body. If long-term consumption of shallots mixed with tofu will cause calcium deficiency in human body and prone to cramps and chondropathy.