Ed Yong of Not Exactly Rocket Science has a post on the recent discovery by an international team of researchers that the number of adipocytes (fat cells) in human beings is set in childhood and adolescence, and remains fixed in adulthood; it is changes in the size of these cells that produces changes in weight. It is also interesting how the team determined that these cells are continually destroyed and replentished at equal rates in adults: dating the cells via radioisotope levels from Cold War nuclear test fallout. The implications of the results are also discussed.


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