Black coffee is low in calories and high in antioxidants, but drinking it with every meal won't necessarily help you lose weight. The 3-Day diet, also known as the egg diet, the grapefruit diet or the black coffee diet, is a fad diet that has circulated around the Internet and involves drinking black coffee for every meal. Although it may seem like a quick way to lose weight, the 3-Day diet may be ineffective and unsafe so talk to your doctor before trying it.
