Dynamics of fat cell turnover in humans.
Level 4 - case-series / case-control
Cross-sectional human tissue isotope birth-dating study without longitudinal cohort follow-up specified in abstract.
PubMed 18454136 · doi:10.1038/nature06902
What was done
The authors investigated fat cell (adipocyte) dynamics in lean and obese humans, including individuals after marked weight loss. Adipocyte turnover in adults was measured by analyzing the integration of atmospheric radiocarbon (14C derived from nuclear bomb tests) into genomic DNA to establish cell renewal and death rates.
What was found
Total adipocyte number remains constant in adulthood in both lean and obese individuals, as well as following marked weight loss. Approximately 10% of fat cells are renewed annually across all adult ages and body mass index levels. Neither adipocyte generation nor death rate was altered in early-onset obesity.
Why it matters
This study shows that human adipocyte count is established in childhood and adolescence and remains stable in adulthood, balanced by a constant ~10% annual cell turnover that may serve as a therapeutic target.
Limits
The abstract does not state the sample size (n), participant demographics, or error margins for turnover rates. Depot-specific variations (subcutaneous vs. visceral) and long-term individual longitudinal kinetics are not described in the abstract.
Cited by
- supports When weight is lost, adipocytes shrink in volume rather than being eliminated entirely.