Less active tyrosinase means less dark pigmentation
Molecules (Basel, Switzerland) , 28 (12), 4839
Ascorbic Acid : skins most powerful antioxidant, vitamin C, helps protect against environmental stressors, provide protection and boosts collagen production for clearer, firmer skin
So it's more like the fasting, I think, has the power and you can do it longer in the days surrounding the training rather than like the actual doing of the event
L., Chandrasekhar, J., Madura, J
In Indias Bollywood, lighter skin has historically been favored on screen, and some actresses and actors have been rumored to use IV glutathione or other lightening treatments to maintain a fair look