Jonathan Edwards
"Gibberish"
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Of course I can't read the actual paper due to the paywall, but that doesn't seem like what they're talking about. It looks like they're saying aging or chemotherapy leads to a bias of those types of cells (myeloids) and fasting then refeeding triggers hematopoietic regeneration of lymphoid line cells which would improve immunity. Perhaps the mention of autoimmune disease in the article was a bit sensationalist, but again I can't read the whole paper.
The news release itself is pretty hard to decipher. I agree that the abstract on the journal site seems to indicate that at least in mice fasting shifts production to 'balanced' rather than myeloid - which I guess might mean B cell production catching up with neutrophils. But I find it hard to see much relevance except to heavy duty chemotherapy in humans. I would have thought that any fall off in lymphocyte based immunity in old age was due to die off of T cell clones, since these are mostly generated up to the age of about 20. Stimulating bone marrow stem cells would not change that as far as I can see. There seem to be an awful lot of different experiments packed into one paper and presented in a rather unclear way with rather vague diagrams.