It's just amazing how much "common knowledge" about food has been shown to be completely wrong: * Breakfast is the most important meal [0] * Saturated fat is bad [1] * Carbs are evil [2] * You regain more weight after a fast diet [3] Many will argue but studies have show each one of these to be wrong. [0]: https://www.washingtonpost.com/news/wonk/wp/2015/08/10/the-s... [1]: http://www.eufic.org/page/en/show/latest-sc…
I think if there's one big idea about nutrition, it should be that there are no one-size-fits-all answers. I skipped breakfast for most of my childhood, and I had no idea why I was so lethargic all the time. I was typically anxious from undone schoolwork, etc and had no appetite in the morning. I'd self-medicate with cigarettes. I started forcing myself to eat breakfast about a year ago and my mind is so much clearer…
It is. I haven't eaten breakfast for 20 years, and I don't suffer from any kind of lethargy, tiredness or hunger. I even cycle to work for 30 minutes each day, on an empty stomach, and often don't eat until 1PM. For me, it's actually the other way around: if I eat anything before lunch time, especially sugary things, I often get nausea.
So I guess that confirms your point, there simply is no 'one-size-fits-all answer', everybody has different metabolism. Obviously some things are clearly bad for you, like overeating, insufficient dietary variation, lack of essential nutrients, etc. But these are simply solved with just common sense. For the rest, 'nutrition science' is completely worthless IMO, and more often than not driven by marketing or scientific echo-chambers.