Dunno why this was moderated 0. It's fairly sound advice. At the age of 45, I lost 40 lbs this way, going back to the shape I was in my 20s, even though I did not put forth any effort to restrict or count calories, and I only exercised 15-20 minutes a day. Everyone I know who has done this has experienced good results. I will say that I think different people have different ratios of the above that are optimal for them. Some need more meats and fats, others need more vegetables and fruits.
It's a variation of the old Atkins diet, now called Paleolithic, or Primal, or "whole foods". I think it is just a question of connecting the dots: for most foods, do what involves the least amount of change from the natural state and you are likely doing what is optimal for the body. Get away from the industrialized food chain as much as possible. Why buy vegetables that might have been picked two states over, endured a train ride and a truck ride, then packaging and setting on a cold shelf for a week when you can go to a farmer's market and buy something that was picked today or yesterday? Why buy orange juice that has been sitting in a vat for 90 days, denatured of all flavor, then has flavor added back via industrial "flavor packs", when you can buy fresh oranges and juice them yourself? Or better yet, just eat the oranges. Why buy meat that has been raised in a completely unnatural state from what the animal has historically experienced? (Cows are not naturally grain eaters).
For the most part, the only type of food processing that I think does make sense is the ancient fermented food arts, which led to cheeses and various types of fermented vegetables, which have been shown to beneficially affect gut flora.