Plain black coffee contains very few calories and no added sugar. Sweetened coffee drinks, flavored syrups, and generous amounts of cream can add substantial sugar, calories, or saturated fat.
For people with diabetes or high blood pressure, these additions may matter more to long-term kidney health than whether the coffee itself is black.
Coffee preparation can also affect cholesterol levels. Unfiltered coffee, such as coffee made with a French press, contains compounds that can raise LDL cholesterol in some people. Paper-filtered coffee removes much of these compounds.
There is no universally dangerous type of black coffee for everyone. The best choice depends on caffeine tolerance, preparation method, medical conditions, and overall consumption.