Vegans and Vegetarians
As a rule vegans and vegetarians may be detected by their watery, transparent skin, unless they are exposing their skin to the sun.
Vegetarians (and especially vegans) tend to having thoughts that are fleeting and not "firm on the ground" (not very realistic). The opposite is true for persons who are eating too much meat etc. and who tend to have slow thinking etc.
Animal products contain certain stuff that is not available in plants (at least not in those plants that are eaten). A balanced diet is necessary for neutral-positive thinking and a healthy psyche.