For those curious but not wanting to dredge the article. The study focused on people doing 16-hour fasts with 8-hour eating windows. This was performed in China

For those curious but not wanting to dredge the article. The study focused on people doing 16-hour fasts with 8-hour eating windows. This was performed in China with 100 participants. While this could technically be called intermittent fasting, it is probably the shortest fast possible while still being a fast.