New research explains why our waistlines expand in middle age. Aging shifts stem cells into overdrive to create more belly fat, finds new mouse experiments later validated on human cells. This is the first evidence that our bellies expand with age due to stem cell high output of new fat cells.

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3. New research explains why our waistlines expand in middle age. Aging shifts stem cells into overdrive to create more belly fat, finds new mouse experiments later validated on human cells. This is the first evidence that our bellies expand with age due to stem cell high output of new fat cells.