The premise is, humans didn't really eat carbs for thousands of years, and have got extremely fat since introducing them into their diet.
Umm rice is a carb, and that's been around quite a long time, somewhere between 12,000 and 15,000 years!
Cutting out any food group is absolutely misguided. The psychology of talking about "good" food and "free" food is flawed, it just makes people eat that food irrespective of whether they actually want it. Fast food ads that talk about "refuelling" makes food into a function, to cram down not to savour and appreciate.
People (certainly in the prosperous West) have lost the ability to differential between real hunger and eating by the clock. Also they wolf food down while working instead of doing what the French do, down tools, enjoy a proper leisurely lunch eaten slowly and with enjoyment.
Not wanting to do a TAAT, but there's a discussion about afternoon tea, where people are saying they'd still be hungry - that's because people's expectations about portion sizes and types of food is through the roof compared to 20-30years ago.
Yet we've never been so 'Information rich' about how you can eat a simple balanced health diet to extend life. People prefer quick fix fads for short term gains (getting into a bikini, slimming down for a wedding), not sustainable lifelong habits.