1: Preserved eggs are mainly composed of calcium oxide, soda ash and salt.

2. Main ingredients of potatoes: starch

3. Fish: protein, carbohydrates.

In the chemical reaction of food ingredients, these three foods will not conflict, so they are edible.

However, preserved eggs should be eaten less, because preserved eggs are marinated with soda ash, lime, salt and lead oxide, which contain lead, so if eaten frequently, it may cause lead poisoning.