Even if you're drinking calorie-free black coffee, you should stick to a moderate intake to avoid taking in too much caffeine. While small amounts of caffeine might boost thermogenesis, too much can make you jittery, interrupt your sleep and cause anxiety, depression or a fast heart rate. The FDA recommends up to 400 milligrams — approximately 4 to 5 cups of coffee daily — as the recommended upper limit for caffeine intake. If you're drinking more than 3 cups daily, choose decaf coffee for the extra cups.
Besides the ability to protect our body from free radical that is the main factor of aging and many harmful diseases, antioxidant can also help you succeed your weight loss program. Antioxidant contained in the coffee is just like the antioxidant contained in the vegetables and fruit  such as mentioned in Health Benefits of Starfruit and Health Benefits of Mangosteen Peel which are able to help the metabolism and the calorie burning.
I don’t have a problem with people adding things to their coffee (my wife enjoys her coffee with cream and minimal disapproving head shakes from me) but I do think black coffee has its merits. It is my opinion that the vast majority of coffee additives are remnants from the first wave coffee notion that coffee is vile, caffeine is good and adding things to coffee makes it tolerable.
A 28-year study, eventually published in 2017 in Alzheimer's and Dementia, the journal of the Alzheimer's Association, determined that four to five cups of a coffee a day – a level deemed "moderate" – led to a decreased risk of dementia during that time period. Those who drank coffee in moderate levels had less medial temporal atrophy, which is linked to Alzheimer's disease, compared to those who drank three or fewer cups a day, including those who didn't drink any.
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