Why do southerners like salty porridge and northerners like sweet porridge?

Because the weather in the south is hot, it is easy to consume water in the human body, and the intake of salt contributes to the normal flow of blood, so southerners eat more salty porridge.

Because of the cold climate in the north, northerners eat more sweet porridge, because eating high-calorie food to keep out the cold can supplement calories and enhance resistance.