Tomatoes cooked with tofu will not get kidney calculi, and tofu can't be eaten with spinach, because it will produce a lot of calcium oxalate crystals, which will lead to kidney calculi or urinary calculi.
Extended data:
Tofu is rich in nutrition, containing many essential trace elements such as iron, calcium, phosphorus and magnesium, as well as sugar, vegetable oil and rich high-quality protein, and is known as "vegetable meat". The digestion and absorption rate of tofu is above 95%. Two small pieces of tofu can meet a person's daily calcium requirement.
Tomatoes and tofu can be eaten together. Tomato and tofu soup is delicious. Tofu is rich in protein, so tomatoes are more nutritious. But tofu can't be eaten often in the usual diet. Eating too much will have an impact, mainly on the kidneys. You can eat it in your daily diet, but you can't eat tofu too often.
References:
Tomato and tofu Baidu encyclopedia
Fried tomatoes with tofu Baidu Encyclopedia