If you're one of the 41 percent of Americans who say they've used a food delivery app in the last 90 days, there's a good chance your driver munched on your order.

That's the finding of a new US Foods study, in which a shocking number of delivery drivers — 28 percent, to be exact — admitted to nibbling on their customers' orders.

The study, which surveyed nearly 500 delivery workers who used popular apps such as UberEats, Grubhub, DoorDash and Postmates, was designed to understand the "habits and pain points" commonly found in the industry. US Foods also surveyed more than 1,500 people who said they've used the apps as customers.

For their part, consumers were not happy about the idea of a driver taking a bite out of their order.

"If you ordered a burger and fries, and the deliverer grabbed a few fries along the way, how upset would you be?" the survey asked. Customers were asked to answer the question on a scale of one to 10, with 10 being "absolutely unacceptable." The average score was an 8.4.

Despite the high level of outrage, consumers were generally unsuspicious of drivers. The study also asked those customers if they'd ever suspected a deliverer of tasting their food, and just 21 percent — 7 percent less than the percentage of drivers who admitted to sampling the food — said yes.

The study analyzed a wide range of delivery app behaviors, including tipping, common complaints and which services were most popular among consumers. Uber Eats was the most common service among respondents, followed by Grubhub and then DoorDash.

The survey found that the average customer has two different delivery apps on their phone and uses the service about three times per month.

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