I recommend a podcast called The Genius Life! The host Max is great, but it’s his guests that will have you rewinding point after point. Mostly nutritional science stuff, but also some mental health topics as well. Show moves quick.
The most reliable source of all is nutritionfacts.org
Then there are all the government agencies.
You will see that most of them have a very similar message: eat real food, mostly plants, not too much.
Broken down:
no processed foods
limit animal foods as much as possible
don’t stuff yourself
Skip most podcasts, broscience, unqualified “nutrition enthusiasts” talking about stuff they never formally studied.
There is broad, consistent and overwhelming agreement from every single health organization on the planet about what to eat and what to limit/avoid.
Look up any country’s guidelines and compare with another. They are like 90% identical.
https://food-guide.canada.ca/en/
https://newsinhealth.nih.gov/2018/12/plan-your-plate
https://www.nhs.uk/live-well/eat-well/food-guidelines-and-food-labels/the-eatwell-guide/
Where’s the disagreement OP? Where are you getting your data/sources? Guidelines look incredibly similar to me…