As extreme heat grips much of the United States, the National Weather Service (NWS) has issued a critical advisory urging millions of Americans to avoid drinking coffee and alcohol during the ongoing heatwave. With temperatures soaring into the triple digits across the South, Midwest, and parts of the West, the NWS emphasizes the need for smart hydration choices to prevent heat-related illnesses.Meteorologists say the current heat dome — a high-pressure system trapping hot air over large regions — is creating life-threatening conditions in major cities such as Phoenix, Dallas, Las Vegas, and Atlanta. In response, the NWS is offering updated guidance on how to stay safe, with a specific warning about beverages that can contribute to dehydration.“Caffeinated and alcoholic drinks can increase fluid loss and worsen the effects of heat,” the NWS stated in a recent bulletin. “People should prioritize water and electrolyte-rich drinks to stay properly hydrated during this dangerous period.”Health officials echo this sentiment, noting that both coffee and alcohol act as diuretics, which promote urination and can accelerate dehydration. In extreme heat, dehydration can quickly lead to heat exhaustion or even heat stroke — a potentially fatal condition if not treated promptly.The Centers for Disease Control and Prevention (CDC) also recommends limiting physical activity during the hottest parts of the day, wearing loose-fitting clothing, and checking on vulnerable populations like the elderly, children, and those with pre-existing health conditions.More than 110 million people across the country are under heat alerts this week, and hospitals are already reporting a rise in emergency room visits related to heat exposure. With forecasts predicting continued high temperatures through the weekend, the NWS is expected to maintain or even expand its advisories.