Not exactly a reputable news source, and their citation is a broken link.
I tried to find the study they’re referring to, and the closest I got were some secondary sources referring to an NHTSA stat that eating while driving increases your chances of having an accident by 80%. That’s very very different from “80% of all accidents are caused by eating”.
The sketchy article also mentions distracted driving in general in one of the quotes, which is probably actually what the study was about. Distracting driving causing 80% of accidents is entirely plausible because “distracted driving” is a very broad category.
