2. Spinach is rich in iron and dietary fiber, and tofu contains more plant protein and calcium, which can supplement nutrition together. However, because spinach contains a lot of oxalic acid, tofu contains more calcium. Eating together may produce calcium oxalate, which may easily lead to constipation and affect the body's absorption of calcium.

Before eating, you can blanch spinach with hot water to remove some oxalic acid, and eat it with tofu skin, which can reduce the impact on your body.