Hard to believe
I can pick up a burger and take a bite without looking away from the road, just as I can adjust the air conditioner without looking at the controls. Taking a drink requires tilting your head back, though you may not be too distracted. Texting requires looking at the phone, and devoting attention to it, for several seconds at a time. It's really, really difficult to believe the results of this study.
If they're counting drivers dealing with food packaging, getting their burger out of the bag, etc., then yes, I can see how that would take longer than sending a text. I personally never eat in the car when I'm alone. If I go through a drive-thru by myself, it's in order to take the food somewhere else to eat it. If I eat in the car, it's always because I'm with someone else who can deal with the packaging. (Or if I'm the passenger, I can deal with the packaging so that the driver doesn't have to.) I guess they added that caveat: "Particularly when drivers take their eyes off the road in order to reach for or unwrap items".
