Why can't the bedside be near the kitchen?

I have seen a famous Feng Shui master's video, saying that it is best not to have a kitchen behind the bed, because the kitchen is a fire, which may have an impact on the body. If the pattern can't be changed, the room behind the bed is the kitchen, especially the stove. We can find a way, but the specific method should be based on the five elements of the owner of the house and the orientation of the flying stars of that year. It is best to find a professional feng shui master to find a way according to his personal situation!