I was a vegetarian 95% of the time for many years and mostly vegan for two years until one of my grad students asked if I knew I often started a new sentence in the middle of the previous one. I had noticed it myself but had passed it off as my mind thinking faster than my mouth. But it was really a mix of brain fog and lack of focus & concentration that I never experience while eating ketogenically.

The reason cereals & "healthywholegrains" are full of vitamins and minerals is because they are "fortified" with them. You could just as easily eat the box they came in and pop a multivitamin.