If your job is preparing food you should wear gloves.
Sally works in the kitchen at a diner and is chopping chicken and vegetables for a platter.
Sally wants to create a meal.
Sally cuts the chicken wearing gloves and after she's done she changes them, so she can cut the vegetables.
Sally holds the chicken with her bare hand and cuts with the knife in the other, and then cuts the vegetables.
Sally is able to make a healthy meal that the customers love.
Sally cross contaminates the vegetables with chicken blood that was on her hand and the customers get sick.