I know many of the reasons why betta fish lose color. But I want to know how they do it. Does anyone know?

As far as stress-maybe to seem inconspicus?

keeping color uses energy, it needs more blood, more nutrients, etc. so when they are stressed or they arent getting the right nutrition the blood and nutrients go to more vital things like their muscles or heart, etc. therefore losing the color on their scales.

Thanks. I really appriciate the help.