Overall I am ending this research more confused than when I started it. I think the most likely dietary change I make is to try to avoid foods with soybean, corn, or safflower oil, since this is probably a good stand-in for “foods processed enough that they count as processed foods and you should avoid them”. I don’t think the evidence is good for avoiding fish oil and olive oil, and there’s enough evidence from elsewhere that these foods are healthy that I’m going to keep trying to eat them. I don’t think the evidence is good for saturated fats being especially good, and there seems to be at least equally strong evidence that they’re bad, so although I’m not going to work too hard to avoid them I’m definitely not going to optimize my diet for getting as many of them as possible.~ Scott Alexander from, https://slatestarcodex.com/2020/03/10/for-then-against-high-saturated-fat-diets/
That’s the very last paragraph from a not-overly long piece from Alexander. Overall, yes I agree, I am more confused than when I started trying to sort out my eating.
Which is rather depressing; ~100 years of nutritional science and all we have are a lot of questions. I’ve put a lot of time into trying to figure out what works best for me—for maintaining a healthy weight—and I still am unable to control my weight to a degree that I’d like.
I can say for certain, (n=1, my anecdote, ymmv, etc.,) that there are interlocking causes which I am unable to control. I’ve spent 15 years working very hard, and while I have some ideas of what works, I do not have control.
If you want to read a terrific book that will expand your diet knowledge in some new directions, check out S. Guyenet’s, The Hungry Brain.