From the Reddit thread (you have to click on the image below to link to the Reddit feed):
Dr. Oliver Fiehn is an expert in metabolomics and is the co-lead of one of the major research projects at the Center for Solutions for ME/CFS (CfS for ME/CFS), a NIH-funded collaborative research center at Columbia University. The CfS for ME/CFS will be be conducting a video Q&A session with Dr. Fiehn featuring some of your questions from this thread. Post your questions here and vote on other questions you want to see answered!