Yeah, nutrition is not very well understood, that for sure.
The big problem that most 1st world Countries are now experiencing is the proliferation of Ultra Processed Foods in the diet and a direct causation of the increases in non communicable diseases like diabetes, heart disease, hypertension, obesity, fatty liver, now a serious problem with children, some cancers, metabolic disease and much of this associated with diet but also other lifestyle factors like lack of exercise, smoking, drinking etc.
Since we're talking about food then the mechanism of these non communicable diseases for the most part is inflammation due to impaired glucose tolerance which translates to a carbohydrate intolerance that is generated over the decades and eventually it catches up to most of us, me included. UPF's are the problem which for the most part are refined grains, sugar, seed oils, salt, corn, textured soy and for sure some meat and dairy products but most are plant based with over 50% of all UPF's with added sugars and 89% of UPF have mostly refined carbohydrates as their main source in them. So basically increasing fruit and vegetables are displacing some UPF's we're eating and feeling healthier, which is a good thing. Anytime we consume more whole foods we have healthier populations, generally speaking.
But we are omnivores and not herbivores and in my world nothing wrong with animal protein and in reality and scientifically it's the better choice and should be a macronutrient that gets the most attention considering what protein accomplishes within the body as opposed to our fuel sources which are carbohydrates and fats, and of course fats also have a few essential nutrients that the body can't manufacture itself.
Most people and authorities look at a diet's macronutrients on a percentage basis, they all do for the most part but that is not the best course of action with protein. Proteins are the building blocks and are required for some pretty important tasks like maintenance and growth, hormonal function, enzymatic reactions, immune response, structural support, pH and fluid balance and on and on. Basically protein intake should always represent a number in grams that reflects the lean mass of the individual and not total weight, fat doesn't require protein to exist. It's also well know within the circle of Protein researchers and scientists that the RDA is about half of what we should be consuming and becomes extremely more important as we age with sarcopenia a huge mortality problem with older people.
CD