Unprocessed extra virgin olive oil from early harvests with high polyphenol content (>= 500 mg/ml) may be beneficial for human gut flora.

“Freddy Med study suggests maybe an unprocessed extra virgin olive oil. Um, early harvest that could be beneficial for humans because some of these polyphenols might affect the gut flora positively. And apparently, it's 500 milligrams per ml. That's the cut off you want for polyphenols.”