Exposure to fracking chemicals and wastewater promotes fat cell development, or adipogenesis, in laboratory cell models, a new study finds. Researchers observed increases in the size and number of fat cells after exposing the models to a mixture of 23 common fracking chemicals or to wastewater or surface-water samples containing them, even at diluted concentrations. Adipogenesis occurred through PPARy-dependent and independent mechanisms. More research is needed to assess potential health impacts outside the laboratory.