Hi, its not about just colour black or white.. it shares Health in toto,, ur late night food habits or night shift may be 1of cause salty n sour n junk food which has potential to hamper digestion n liver function which won't allow nutrition to reach targeted tissues so consult ayurvedic dr n plan small detox with rasayan like simple chyavan prash which boots u in all sense

Kindly send ur full details..like ur appetite,motion habit,any allergies,any sinusitis,any addiction...