Thanks, I am a recently turned vegan. I can't say I have experienced the change in "as little as a day". I've been a lifelong lacto-vegetarian (like most indian people) and recently dropped diary (last 2 years).
Nitpick: Most Indians are NOT vegetarians, less than a third are. http://www.thehindu.com/todays-paper/the-food-habits-of-a-na...