This seems to be a (very typical) misuse of NHST. All we want to know in this case is which of the following statements is the more probable: (1) Intermittent

This seems to be a (very typical) misuse of NHST. All we want to know in this case is which of the following statements is the more probable: (1) Intermittent fasting has benefits. (2) Intermittent fasting does not have benefits. Instead, what we're being told is that we can't reject (2) with a high degree of confidence. When you look at the sizes of the groups in the study, this is pretty obviously going to be the case. With so few participants there'd have to be an enormous difference between groups in order to be sure that (2) is false. They need hardly have bothered doing the study at all.