But I would be watchful for signs and symptoms within the latter third of your complete fast as suggested on the website you have included in your post. May also be worthwhile browsing to find other sites that may also list deficiency symptoms as well and make a comparison between all of them. In my opinion, deficiency is extremely rare as your body will economize prudently on what you have by the way of reserves.
Any further questions or queries I am sure we will all be happy to lend a hand.