Where you go wrong is you assume that these writers are saying that eating a normal diet of meat, potatoes and vegetables and fruit somehow made us all sick when these writers are saying that a diet of low-fat food products is what got the ball rolling back in the early 80s by replacing too many calories from fat with too many calories from refined carbohydrate which then left us hungry and nutrient deprived. At the same time, food manufacturers discovered their low-fat products had similar properties to light cigarettes, which happen to cause the smoker to smoke more cigarettes. Low-fat snack foods did the same because they were guilt-free and unsatisfying. There has also been a lot of pressure for corporations as time has gone by to sell more and more and hence a myriad of fat-free, sugar-free, high-fat, high-sugar and every permutation of highly-processed, stimulating food that keeps us hungry and buying more. The effect of all this carbohydrate in the absence of fat and protein has been devastating to human health, as has the replacement of lard and butter with soybean oil and hydrogenated vegetable oil. There has been a convergence of many things simultaneously. You should read the series on why are we hungry on the gnolls.org website so that you have a more nuanced understanding of things and stop thinking in such reductionist, all-or-nothing, black and white terms.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 180 x 2. Current Deadlift: 230 x 2