This study will examine whether dark chocolate affects the way patients
with hypertension (high blood pressure) respond to insulin, a hormone
secreted by the pancreas that regulates blood glucose (sugar) levels.
In many people with hypertension, insulin is not as effective in
helping the body use glucose. This is called insulin resistance.
Insulin also increases blood flow into muscle by opening inactive blood
vessels. Laboratory studies suggest that eating dark chocolate may
improve blood pressure. This study will determine whether dark
chocolate improves insulin resistance or changes how blood vessels
react to insulin in hypertensive people.