Even small increases in consumption could bring substantial health benefits
As my old stats lecturer drummed into me, correlation does not imply causation, and it is a good place to start looking.
I wonder how much of that is additional micronutrients from whole grains, and how much is displacement of refined sugars and starches.
One implies deficiency effects, things that are needed in trace quantities for efficient cellular function that have multiple overlapping long term impacts on survival and functional probabilities.
The other involves incapacitation of systems via overload and various levels of cellular and sub-cellular stress response.
And then of course there can be be secondary, tertiary synergies etc.
Biology gets really complex, really quickly.
And I have been on a vegan wholefoods diet for 6 years now. Given that medical opinion 6 years ago was that I was unlikely to survive 6 months, I am convinced. [My life insurance paid out, so it was serious.]
Once ejected from the medical system as “palliative care only”, my only options were diet and belief. I used best evidence available in both domains. Am strict vegan, high dose vit C, and still alive.
A case study of one, but with many sub-cases of cancer tumours coming and going in response to small changes in diet.
As a biochemist by training, I suspect the biochemistry of the effects are many and subtle, and may take a very long time to enumerate in detail, and they certainly seem to be there. Evidence is clear, any animal products in diet are a risk factor, and more than 10% of total calories coming from animal products are a significant risk factor in cancer, heart disease and diabetes. The World Cancer Research Report – http://wcrf.org/int/research-we-fund/continuous-update-project-cup has 8 recommendations starting on page 375 – as one example.
Evidence sets are vast.
Pressures from profit based groups to obfuscate and hide this information with pseudo studies under the auspices of respected institutes is even bigger.
Very strange system we find ourselves in.
All aspects of our health and well being and freedom are held hostage to profit at so many different levels.
In games theoretical terms, cheating strategies now clearly dominate the human cooperative. It need not be that way. We have other options.
It only takes awareness and choice.