I don't know how the body works on molecular level (Don't ask me what amino acids are in ATP-Synthase) but thanks to chemistry, physics, maths, biology and control engineering, I have a pretty good understanding about the human body. (a engineering prof at my uni loves nature and is always telling his students to look for answers in nature) Diffusion und solubility. that's the basic engine in our body. But to understnad that fatties need to visit many classes and have to think on their own.