"He is the first to directly relate diet to health."
No he isn't...
One mans food is another mans poison.
Hippocrates
Let your food be your medicine, and your medicine be your food.
Hippocrates
And I would bet he learned this from somewhere/someone and so on... It is only recently in our history, perhaps the last few generations that we have forgotten this. If you are in your mid-40's to 50's and had a country raised parent, I bet they practiced food as medicine... mine did.
There is a reason that we MUST respect our elders... especially those that have knowledge that cannot afford to be lost.