The molecular mechanisms that lead to the generation of adipose tissue (adipogenesis) are of basic and biomedical interest. Cellular models of adipogenesis have proven extremely valuable in defining biomolecules鈥攑rimarily genes and proteins鈥攖hat regulate adipogenesis. Here, the analysis of differentiating adipocytes using an untargeted metabolomics approach led to the discovery of the monoalkylglycerol ethers as a natural class of adipocyte differentiation factors.