Mineral taste test

I used to be a lot more confident in medicine, tests and official dietary advice, but after having gone through the system I've lost so much confidence confidence in it, but then how do you know you are getting all the minerals you need if your doctors opinion about the matter is that malnutrition is for alcoholics and vegans?

I'm interested in intuitive eating which is a new concept for me, and I noticed that my magnesium flakes "changed taste" from sweet to a bit bitter and metallic as my symptoms of magnesium deficiency abated.
Seems like it works like that with zinc too, according to this video:  https://www.youtube.com/watch?v=egfy40VyVL8&t

*Do your taste buds know that you need magnesium and decide to reward you for getting it with that sweet taste or is there something else going on?
*Is there any proper research or old traditional doctor books that are helpful and sensible about deficiencies ?

I don't know about things changing taste. I do however eat whatever I feel like within reason, many times when I work a very hard day in the sun I just feel like drinking a ton of milk. I read that as my body needing protein and the other vitamins and minerals in the milk. Same goes for greens and vegetables, lots of times in the winter all I want is some soup with different kinds of vegetables. I try and curb the sugar impulse while listening to the cravings for foods that are natural.

Your milk craving makes total sense, I have it much the same way with milk but I can't tell what specific thing in it that I crave.
I used to have super strong sugar cravings, or sweet cravings really, and I think it is simply a sign of low access to energy reserves, in my case because of magnesium deficiency and insulin resistance. A lot of it stopped when I got more magnesium and went low carb but I still have a bit of it when I wake up early. Chocolate cravings were insane too and went away in a few days when I got the magnesium in other ways. So odd that nobody tell us stuff like this in school so that we grow up with the knowledge to try and self-correct deficient mineral status rather than look at it as if it's a matter of will to eat "healthy"