There's some grumbling going on down there. The muscle fibers are complaining about getting stuck with all the heavy lifting. LDL is tired of getting called "bad" cholesterol, and the blood cells don't like all the traveling they have to do in their job. A little speck is trying to convince the brain these bad attitudes are all in the head. A little speck? Yeah, a proton is telling the brain he can take charge of the situation with the power of positive thinking!