ACKNOWLEDGMENTS
Supported in part by the Intramural Research Program of the National Institute on Aging, NIH, Baltimore MD, USA. DWB received support from R01AG061378. VBK received support from P30AG028716; VBK and MO received support from R01AG054840. BS received support from U01AG060906. SD, SBR and LMR received support from R01AG071707. We thank the CALERIE Research Network R33AG070455 for their assistance in this project. The CALERIE trial was supported by grants U01AG020478, U01AG020480, U01AG020487, and U01AG022132.