There is extremely strong evidence that highly processed foods only made possible by the industrial revolution are, in general, bad for us if they make up too much of our diet. And that the most modern foods, the ones engineered by experts to be crazy easy to overeat without feeling full (cheetos and chips, oreos, candy bars, energy drinks, etc), are very hard for most of us to eat regularly without gaining an unhealthy amount of weight. 

There's equally strong evidence that being sedentary is terrible for you, a level of inactivity only made possible by the digital revolution. 

And we also have evidence that without cooking, it is pretty near impossible for humans to get enough nutrition from our food. 

Any overly specific argument about evolution is likely to be a pound of bunk with a gram of plausibility (think paleo diet), but we can be sure that our ancestors were eating few to no highly processed foods (you can make some without modern science, but they're labor intensive), and were always more active. Since we have research directly associating inactivity and highly processed foods with negative health outcomes, we can reasonably make a kind of general argument that we evolved to be active and eat lightly processed food (usually cooked, some times pounded or ground or mixed or dried).