Does anyone attribute their diet to a successful mood?

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I'm diabetic so diet has been a huge and quite intense part of my life at various stages. I now track my bloodsugars over time with a Freestyle Libre and I keep track of when I work out, when and what I eat, etc. So I can see how food affects my bloodsugars and mood nearly directly.

What I've learned:
* Keto is great for losing weight but not much benefit for 99% of healthy people unless you're very strict with it (and almost everyone on /keto/ forums and shit isn't strict enough for it to matter).
* Carbs should not be the enemy, but refined carbs should.
* White flour and other refined valueless carbs make me feel mentally lethargic and I think they slow down my gut bacteria, haven't seen any studies on this though, so grain of salt
* Never drink calories. Just don't, there's no reason to and you'll soon learn soft drinks taste like shit anyway
* The single key to good diet is: Eat more veg. Anything else is overdoing it. You can try to cut out X Y and Z but you'll usually fail, and simply eating more veg accomplishes this anyway because you're fuller for longer (and for cheaper) and your taste profiles will change over time naturally. Pic related.
* Walnuts always make me feel mentally refreshed the next day. I know they have lots of omega 3 and hardly any omega 6, but I also eat a lot of oily fish so there must be something else in Walnuts that make them exceptional. Haven't read enough to know, but I know they're awesome
* Good diet doesn't matter unless you're working out enough for it to have an affect- This means being fit and active. Good fitness + good diet = good human, simple as.

tl;dr stop TRYING to cut shit out, eat more veg and do it naturally.

Also this page is the one I've used and been helped by more than any other: http://www.whfoods.com/foodstoc.php
It's concise, links to full scientific studies and analysis, nutrient content, etc. Eat 50% of the foods on that list per month and your diet is Golden, simple as