All conversion calculators can be used for converting from metric grams to U.S. ounces, teaspoons, tablespoons, or cups. Two of the calculators allow you to convert by the specific ingredient and the third is a generalized calculator that uses an average gram weight.
In addition, some studies found that two or more cups of coffee a day can increase the risk of heart disease in people with a specific â and fairly common â genetic mutation that slows the breakdown of caffeine in the body. So, how quickly you metabolize coffee may affect your health risk.
Negative Influence on Vitamins and Minerals: 1  Caffeineâs diuretic effect causes loss of potassium, calcium, magnesium, zinc and other minerals, the B Vitamins, especially thiamin, B1, and Vitamin C. 2  Caffeine, and particularly coffee, reduces absorption of iron and calcium, especially when it is drunk around mealtime.