Black coffee contains no significant amounts of the macronutrients, fat, carbohydrate and protein and therefore contains only 1-2 kcal per 100ml34.
However, the final nutritional profile of a cup of coffee will be affected by several factors:
- The addition of milk, cream, sugar or other sweeteners to taste will affect the final nutritional value and may increase the calorie content
- The variation in cup sizes used across Europe may alter the nutritional value
Black coffee contains a number of micronutrients, notably potassium, magnesium and niacin. The sodium level is very low. The data below provides the micronutrient nutritional profile of 100ml of medium strength black coffee34.
The type of water used in preparation (i.e. hard or soft water) may influence the micronutrient content of a cup of black coffee, particularly in relation to calcium and magnesium levels. Slight variations in composition may occur due to origin, growing conditions, blend composition and processing of the coffee.
Coffee and hydration
Black coffee contains in excess of 95% water and, according to research, when consumed in moderation, does not lead to dehydration. Therefore, a cup of coffee can help contribute to the daily fluid balance35-37.
- Studies have shown that caffeine consumption, up to the equivalent amount found in 5 cups of caffeinated coffee, does not cause dehydration35
- There may be a mild short-term diuretic effect from caffeine but this is not strong enough to outweigh the benefits of fluid intake from coffee consumption35
- Research suggests that moderate caffeine consumption does not alter total body water and fluid distribution36 and drinking a variety of caffeinated beverages, such as coffee, can contribute to meeting the body’s requirement for fluids37
- The body of evidence available suggests that advice to abstain from coffee drinking to maintain fluid balance is unfounded