Americano is just a kind of coffee drink, and does not have any efficacy and effect of drugs. Coffee has a bitter taste and special flavor, and each 100g of coffee contains 68.9g of carbohydrates, 17.1g of proteins, 204mg of phosphorus, 2013mg of potassium, and 132mg of magnesium, which can be used to replenish the nutrients required by the human body when consumed in moderation. It should be noted that breastfeeding women, heart disease, premature beat patients should not drink, because when breastfeeding babies, caffeine will enter the body of the baby with the milk, thus affecting the growth and development of infants, and at the same time, heart disease, premature beat patients drink it, it is easy to lead to tachycardia, aggravate the condition. Pregnant women should also be cautious about drinking coffee, as large amounts of it can cause nausea, vomiting, headache, rapid heartbeat and other symptoms. And American coffee should not be consumed with alcohol, tea, etc., so as not to aggravate the cardiovascular burden and affect sleep.