 At the cell level, there can be deficiencies happening. At the tissue level, there can be excesses. Just make this a bit more clear by giving you two examples. So let's say that the blood magnesium drops a little bit too low. Well, the body's going to pull magnesium out of the cell to prop up the blood level to maintain the blood. So the blood looks normal, but at the cell level, there's an impending magnesium deficiency happening.