Again, it's the caffeine working here. Your recommended maximum amount of caffeine is 400 milligrams, roughly the amount that you’ll get from 4 cups of coffee. If you’re caffeine-sensitive, be careful with coffee. You are probably already aware what amount and what kind of coffee suits, or doesn't suit you. The amount of caffeine that is safe for human consumption is actually written in our DNA.
Caffè Americano or simply Americano (the name is also spelled with varying capitalization and use of diacritics: e.g. Café Americano, Cafe Americano, etc.) is a style of coffee prepared by adding hot water to espresso, giving a similar strength to but different flavor from brewed coffee. The drink consists of a single or double-shot of espresso combined with between 1 and 16 fluid ounces (30–470 ml) of hot water. The strength of an Americano varies with the number of shots of espresso added. In the United States, "Americano" is used broadly to mean combining hot water and espresso in either order. Variations include long black and lungo.

Caffè Americano or simply Americano (the name is also spelled with varying capitalization and use of diacritics: e.g. Café Americano, Cafe Americano, etc.) is a style of coffee prepared by adding hot water to espresso, giving a similar strength to but different flavor from brewed coffee. The drink consists of a single or double-shot of espresso combined with between 1 and 16 fluid ounces (30–470 ml) of hot water. The strength of an Americano varies with the number of shots of espresso added. In the United States, "Americano" is used broadly to mean combining hot water and espresso in either order. Variations include long black and lungo.
Academy of Nutrition and Dietetics' spokeswoman and registered dietitian Joan Salge Blake says she considers increased cognitive function to be one of coffee's healthiest perks. A study published in the "American Journal of Epidemiology" in 2002 found that current coffee consumption, as well lifetime caffeine use, may be correlated to better performance on cognitive tests among women. For men, coffee consumption is linked to slower cognitive decline. Overall, coffee may reduce both cognitive and motor deficiency associated with aging.
Drinking more coffee is linked to a lower risk of depression, according to a review of 26 studies published in Australian & New Zealand Journal of Psychiatry in 2016. For each cup of coffee consumed per day, the risk of depression decreased by 8 percent, the researchers found. However, it's worth noting that too much caffeine can cause problems in people who also suffer from anxiety, negating any beneficial effects the coffee can have on depression risk.
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