Education must come into play. Your own case illustrates this, as there is no such consensus view.
And even granting the possibility that you are exaggerating for effect, it's hard to find a field of knowledge with more contention than dietary nutrition, so one has to be even more diligent about acquiring expertise and not fooling oneself.
Education matters for the consensus (for arbitrary reasons) but in my own life, my prior experiences with food inform my next meal. Education doesn’t come into play at all.
Let me pose this another way, why would you expect me to change the amount of bread i eat because of another year education? I already had 13 years of teachers telling me it should be the foundation of my diet and it didn’t stick. Why would the next year of education be any different?
You seem to be conflating "education", in the general sense, with education in a specific subfield.
I wouldn't expect another year of English literature, calculus, and nuclear physics courses to teach me anything about biology, civics, or textile manufacturing that I could apply to my day-to-day life, either—but a year of education in nutrition science, the practical workings of government, and traditional spinning and weaving techniques? That makes a huge difference.
The modern consensus (or perhaps official, since consensus may be different) is that you should be eating more vegetables than grains.
So you appear to agree with the consensus of experts that grains should not be the basis of your diet. This has been the us governments recommendation for over a decade (https://en.m.wikipedia.org/wiki/MyPlate)
Sure but "my personal experiences match up with the expert consensus from the past decade" (and really longer, the 2005 food pyramid was for slightly more grains than veggies, not double) isn't a particularly strong argument for disagreeing with the expert consensus.
If what you're saying is "I disagree with expert consensus from the 80s", well then sure, but so does the expert consensus! That's how the scientific process works (slowly).
Which is ironic considering what the discussion is about: you conducted your own scientific experiment on yourself, disproved the consensus-accepted rule, and came to new conclusions.
To achieve that, you needed to have enough confidence in yourself and your ability to measure and feel stuff (which some people think is bad, apparently) versus some consensus which purports to know better.
Courageous new science regularly blasts old knowledge and education to bits, and that's a good things.
And even granting the possibility that you are exaggerating for effect, it's hard to find a field of knowledge with more contention than dietary nutrition, so one has to be even more diligent about acquiring expertise and not fooling oneself.