It's not an idea that needs putting to rest. There is no legitimate research that supports such causation. "Validation" would invalidate the existing body of research, which is improbable.
Science still doesn't know how food gets digested and becomes poop. Will you stop eating, because science doesn't know what really happens during digestion?
You're going to really need to provide some kind of evidence for this, because I'm pretty certain that scientists do have a pretty good idea how this process works.
For that matter, I could give you a layman's explanation that, while it may not be 100% accurate, probably would come really close to a real explanation...
P: If my belief is false, I have no explanation for my experience.
P: Losing the explanation that I've used to validate my experience would be deeply uncomfortable.
C: My belief is true.
P: This scientific study agrees with my belief.
C: This scientific study is true.
Choose your X:
Stop breastfeeding
Start walking
Start playing in the park
Start eating solids
Start throwing tantrums