Blueberries and white-fleshed freshwater fish are blue in appearance, but there are really few blue foods. Things that are blue in nature generally contain copper, which is a heavy metal and harmful to human body. Maybe this is an important reason.

There is not much blue food. Apart from rare blue-purple potatoes and blueberries, we seldom see blue vegetables or meat. Blue food naturally won't arouse people's appetite.

Because there are few blue foods in nature, we can still use some tips, such as putting the food on a dark blue plate as far as possible, and the supporting tableware is blue; Or replace the light in the refrigerator with a blue light bulb, which invisibly reduces your desire for food and achieves the effect of slimming; Or, buy a pair of popular blue sunglasses.

There are not many blue foods in nature. Blueberries are one of them. There is also a rare blue-purple potato and some berries. In addition, creatures in nature have the instinct to avoid eating toxic food. When humans first foraged in primitive times, they regarded blue, purple and black as potentially lethal food colors and would not try them easily.