Are you really going to faint if you are unable to eat those chocolate almonds before you make it through checkout? (And this was one of those slow summer days with no wait at checkout.) You say you'll pay at checkout--but it is so easy to forget that wrapper in your pocket. And it is pretty hard to weigh those cherries once they are in your stomach.
How do you feel about your checkout worker handling your organic peaches while eating fishy sushi? Not to mention spilled sticky beverages ruining scales and other checkout equipment.
If you need to eat frequently, please have a snack before you start shopping. And if you do need a snack while working, please tell your squad leader, step aside from your work station, and purchase your snack.