Polyphenol-Rich Coffee Leaf Extract Alleviates High-Fat Diet-Induced Intestinal Barrier Dysfunction through Modulation of Barrier Integrity, Enterohepatic Axis, and Gut Microbiota.
Mei S, Cao Q, Huang G, Chen D, Kitts DD
Polyphenols
Coffee plants in your garden or at your local café produce leaves that are usually thrown away, yet they may contain some of the most powerful natural compounds for protecting gut and liver health — suggesting a whole new use for a crop billions of people already grow.
Scientists gave mice a extract made from coffee leaves while feeding them an unhealthy high-fat diet. The mice that got the coffee leaf extract ended up with less body weight gain, less liver fat, and a healthier gut lining compared to mice that didn't get it. This suggests that coffee leaves — not just the beans — are packed with health-boosting plant chemicals that could one day benefit people too.
Key Findings
Coffee leaf extract at 100–200 mg/kg body weight reduced body weight and lowered TNF-α (an inflammation marker) in the blood, colon, liver, and brain of high-fat-diet mice.
The extract strengthened the gut barrier by increasing tight-junction proteins and reducing intestinal leakage of d-lactic acid, a sign of gut damage.
Liver histology showed reduced fat accumulation and cell injury, alongside decreased triglycerides, total cholesterol, and LDL cholesterol levels.
chevron_right Technical Summary
Researchers found that a polyphenol-rich extract from coffee leaves protected mice from the harmful effects of a high-fat diet, including gut damage, liver fat buildup, and systemic inflammation. The findings suggest that coffee leaves — typically discarded as agricultural waste — contain potent bioactive compounds with significant health-protective properties.
Abstract Preview
A polyphenol-rich extract (WEAC) from coffee leaf was previously shown to protect the epithelial barrier integrity. This study investigated the protective effects of WEAC in C57BL/6 mice fed a high...
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Coffee is a beverage brewed from roasted, ground coffee beans. Darkly colored, bitter, and slightly acidic, coffee has a stimulating effect on humans, primarily due to its caffeine content, but decaffeinated coffee is also commercially available. There are also various coffee substitutes.