Young blood rejuvenates old brains

The ageing systemic milieu negatively regulates neurogenesis and cognitive function

The scientific post here:

http://www.nature.com/nature/journal/v477/n7362/full/nature10357.html

The science blogger writing about it here:

http://www.guardian.co.uk/science/neurophilosophy/2011/sep/05/young-blood-rejuvenates-old-brains

This paragraph was fascinating;

These results suggest that chemicals found in the blood of old mice inhibit the generation of new brain cells, whereas chemicals in the blood of young mice promote it. The researchers then injected blood from young or old mice into young adults. Again, they found that animals injected with old blood had far fewer newborn neurons in the hippocampus than those injected with young blood, confirming that old blood contains soluble factors that inhibit neurogenesis.