natural fats are generally healthy and keeps you satisfied for longer and in a less crashy way as opposed to sugars/carbohydrates in general
I feel like I experience a reduced need to eat and snack when my food includes natural fats, especially when in combination with protein. To put it very simply, I’m persuaded the more healthy fats, the better, they should not be limited or demonized in the way that they have been maligned when sugar was the greater evil all along
Methylated B vitamins and vitamin D were life changing discoveries. I have some polymorphisms (VDR and MTHFR) that mean I am less efficient at absorbing them from food. 2000 IU a day and a B-complex ended chronic depression/anxiety and insomnia for me. Those mutations are pretty common so I highly recommend trying them for anyone with similar issues.
Aside from that I think a whole foods plant based diet with some eggs and fish and no refined sugars is probably the way to go. Some micronutrients like vitamin A and K2 are more easily absorbed from animal sources, so eating a small amount of meat and/or eggs is probably a bit healthier than pure plant based IMO.
Research has shown that for the average person, vit D supplements are practically a waste as the forms they provide don’t match what we need.
You and I are special cases.
Sun is what the typical person needs, so their body can produce the forms of D they need.
How do you know you have this? I got so much benefit from Nicotinamide Riboside, and after years of low vitamin D levels finally found one supplement that raised them, VeganD3+K2 - I’m not vegan but that is the one that has worked. Not sun (I get plenty of that) nor fish nor any other supplement ever got it out of the alleged critically low range.