So black rice bran may be even healthier than brown rice, Xu says. He and his colleagues also showed that pigments in black rice bran extracts can produce a variety of colors, from pink to black, and may be a healthier alternative to artificial food colorants that manufacturers now add to some foods and beverages.
Because this gene is found on the X-chromosome, more men than women have trouble telling red from green. This is because women have two copies of the X chromosome while men have just one. If a man inherits a nonworking opsin gene on his X-chromosome from his mother, he must be colorblind.
Meanwhile, if it is true (as this research study suggests) that men who don't smile are perceived by women to be more desirable and if it is also true that Black men smile less than non-Black men, then this may explain part of the reason why Black men, but not Black women, are sexually/romantically desired in our society.