A low percentage of transferrin saturation may be a sign of iron deficit in the body. It is suggestive of some types of anemia and it is usually correlated with a low level of hemoglobin. The types of anemias that shows a low percentage of transferrin saturation are iron-deficiency anemia and anemia of the chronic disease.
I think he should change them maybe 1-2 times for sanitary reasons, even if he’s working with the same food .. when he touches something else , bacteria can get on his gloves ?