I also got inspired into the no-grain diet because I read in a very good website (posted in this forum) for animals (cats), that the cats were getting good digestion (no more diarrhoea) in only 24 hours after changing their diet to no grain diet. And these cats were sick for years!!!
Then I also remember my improvements when I tried the SCD diet from Elaine Gottschall that goes is that direction too. Improvement is instantaneously. You see suddenly that the kind of bacteria operating in your intestines has changed completely, because the odour of the bowel movements is gone. In hours!
So the experiment is really easy to do, just in 24 hours you can see wheatear it is working or not.
If it works, you will get the blood cleaner because it stops getting the poisons produced by the bad digestions.