Why am I supposed to look at my tongue? According to ancient medicine, the tongue is connected to major energy meridians and internal organs. So you can “read” it much the way a psychic might read your palm.
How do I do it? When you wake up, before you brush your teeth or have that cup of joe, take a look at your tongue. Note the color (is it a healthy pink?) and the texture (are there any rough patches or indentations?). Then, if you do notice abnormalities, consult this diagram to see what part of the body it might correspond to.