But sometimes the body can no longer take the required vitamins from the food.
I have to have a B12 jab in the arm every 3 months as I can no longer absorb that vitamin through the gut. This was something that the Doctor picked up on 7 years ago when I was taking an HGV medical. The early symptoms are a tremor when holding my arm out stretched. Apparently if it's not picked up early it then leads to anaemia and early dementia as the link states.