Is high temperature bad for vitamin A,B,C,D? Does heat degrade vitamins?

Is hight temperature bad for vitamin A, B, C and D ?

Does heat degrade vitamins ?

Are there less vitamins in cooked vegetables and fruits ?

Yes, high heat degrades certain vitamins. Some vitamins are heat sensitive, but many vitamins are insensitive to high temperatures.

Vitamin C and some B vitamins are sensitive to excessive heat, so you should not cook fruits and vegetables to keep high amounts of these vitamins. On the other side, the heat resistant vitamins are A, D, E, K.

The positive impact of cooking is that it helps to better absorb some vitamins.