It could say nothing since we don't know about potential negative trials.

How many research groups tried this with a similar N=14 size group but got statistically insignificant results and thus were not able to publish results?

> How many research groups tried this with a similar N=14 size group but got statistically insignificant results [..]

Thanks to p-hacking, I would expect most small studies to get statistically significant results. Though that doesn't settle the more important question of whether they manage to get published.

Since I believe this is religious fasting, the subjects probably didnt smoke during the day. Question is of course how many smokers are there in the group.