First the link to this week’s complete list as HTML and as PDF.
The exact equality between male and female results seems a dead giveaway that something must be fishy in Gregoricka & Sheridan’s result. Looking at the urban setting of Jerusalem I expect the agriculture in its surroundings to have been quite intensive with lots of manuring. No samples of grain were measured and it’s rather probable that they and the bread baked from them were elevated in heavy nitrogen while animals got their fodder from unfertilized sources. A second, probably very much smaller effect might be fasting. Contrary to Western Christianity this usually includes refraining from any drinking at all in the Near East (for Jews, Muslims, and presumably Eastern Christians too), forcing the body into water conservation. With their nitrogen values not higher than some goats’, meat consumption is not proven.