Why do some people become warm after eating?
It could be from a combination of factors, which is why this
tendancy seems to be different for different people. The main
reason might be that one of the first things to get digested are
simple sugars and since sugar is the body's preferred source of
energy, it burns it up as it enters the blood stream through the
stomach lining and that's what makes a person warm.
Another reason is that the digestive process uses lots of
energy, and that creates a lot of heat. For the same reason our
bodies get warm when we exercise, we also get warm when we
Other reasons would have to include the parasympathetic division
of the autonomic nervous system. This system is designed to make us
more relaxed to allow our bodies to divert more blood to our
digestive system, and that in turn would also help warm us up.