I call this the "Everything in Moderation" fallacy. From what I've heard people who say it, they emphasize the everything part of it. In other words almost everything is bad for you so just eat a little bit of everything and you won't get too much of the bad stuff. It's maddening.
I don’t think “Everything in Moderation” means you won’t get too much of the bad stuff. The philosophy alludes to the fact that in the modern world, trying to have the ideal diet is exhausting and near impossible. Lack of choice, money, time, education, self control etc. all contribute to you intentionally or unintentionally eating stuff that’s going to do irreparable harm to you. You could be eating salads and somehow poisoning yourself with pesticides and high sugar/fat/sodium salad dressings. Which is why this philosophy focuses on, do everything in moderation and you’ll maybe avoid CVD and other diseases for longer. It is meant for people who cannot meet the idealistic standards of what you are supposed to do.
What is moderation? The volume (or mass) of a single apple of alcohol is going to make you very drunk (most alcohol is mixed with water: an apple's worth of beer is very little, that much Everclear is a problem).
That is what I hate about the everything in moderation. We need to do better since some things should be in much larger amounts than others.
I think we all would agree that any amount of rat poison is a bad thing, thought perhaps this is too much of a strawman.
The way I understand it (and my understanding is certainly poor, so I welcome well-supported pushback on it), is that few, if any, components in the food that we in developed countries eat today are actively harmful in themselves (with the caveat outlined below)
The main issue is overconsumption leading to overweight and obesity. Food that’s high in refined sugars and/or saturated fats tend to contribute to this, because it’s palatable and calorie-dense
So in that sense, yes - I believe that as long as your diet is varied enough that you get sufficient intake of all, or at least most, of the essential nutrients, and you don’t eat too much (i.e. in moderation), the ratio of macronutrients doesn’t make a big difference to your health outcome
The crux is that moderation is hard when the food is jam-packed with calories, and it’s so delicious you just want to keep stuffing your face