GREY is a neutral and represents a point between two contrasting and motivations. Grey in the first position means that you want to shut yourself off from everything and remain uncommited, so that you can swing with opinion and emotions. You hate joining anything with 'group' connotations and are an observer rather than a doer.
BLACK, chosen second, it means you are prepared to give up everything else to achieve what you want.
If you put BROWN in fourth or fifth place, you are not very concerned about your health and body. This means you are probably in good shape.