"When water molecules escape from your frozen food, it is also possible for oxygen molecules to seep in. The oxygen molecules can dull the color and modify the flavor of your frozen product. Food that has freezer burn is safe to eat, but you may find the texture and taste not to your liking."
Source - https://www.loc.gov/rr/scitech/mysteries/freezerburn.html
Material Manager or Scrub Tech. It depends on the hospital. A material manager orders supplies for the entire hospital while a scrub tech makes the supplies stocked in the operating room
2) By influencing a person's food choices
