About mixing the old food with the new food in a buffet...You're only supposed to hold food on a buffet at certain temperatures for certain lengths of time, and if you're just dumping new food on top of old food, who knows how long the old food has been there? It could have been out for ten hours if the trays are never replaced. Also, think of the amount of handling the food gets, and if people are poking around in the food, re-using dirty plates, sneezing and coughing on the trays, etc., then you're just letting that contamination get stirred around instead of replacing it with clean trays of food.
At the temperatures most buffets hold their food, the bacteria is still going to be able to grow, just a lot more slowly. If you refill the pans instead of replacing them you'll be giving it more of a time opportunity to multiply enough to make someone sick.
Personally, I can't think of a buffet that I've ever eaten at where the food seemed to be held at over 145 degrees, which is what I think the guideline is for hot food, if I remember correctly.
At the temperatures most buffets hold their food, the bacteria is still going to be able to grow, just a lot more slowly. If you refill the pans instead of replacing them you'll be giving it more of a time opportunity to multiply enough to make someone sick.
Personally, I can't think of a buffet that I've ever eaten at where the food seemed to be held at over 145 degrees, which is what I think the guideline is for hot food, if I remember correctly.









