Coffee contains many compounds that studies suggest exert beneficial effects for metabolic and cardiovascular disorders. When enjoyed after a meal, it may increase levels of an appetite-regulating hormone, improve blood sugar levels, and boost endothelial function. Researchers enrolled 19 healthy men in a study where each subject was given a test meal with a polyphenol-rich coffee drink, or placebo drink. Testing 3 hours after the mark revealed that the coffee beverage lowered glucose significantly, and increased flow-mediated dilation (FMD) – a marker of blood flow and vascular health.