Be positive!

I found out that in UK there is no such idea as a body grease rate. In Japan a body grease rate is a common idea, and it is not rear that weight measure have a function to measure a body grease rate. My friend said that it was negative to meager a body grease rate. She said we should measure a body muscle rate. I agree with her to hear her opinion. OK! I will be positive. The part of body which is not grease is not necessary muscle. We only can have the idea that a rate of the part of body which is not grease.
100%-( a body grease rate)= (a rate of the part of body which is not grease.)