It concludes: “Grape powder consumption significantly decreased the total cholesterol by 6.1 percent and high-density lipoprotein cholesterol by 7.6 percent.
“There was also a trend of decreasing low-density lipoprotein cholesterol by 5.9 percent, and decreasing total bile acid by 40.9 percent.
“In conclusion, grape powder consumption significantly modified the gut microbiome and cholesterol/bile acid metabolism.”
A separate study, published in the Food and Function journal in 2015, found that red grapes specifically were more effective at lowering cholesterol than white grapes.