Yes, black coffee is approved for the Whole30 diet. The Whole30 program emphasizes whole foods and eliminates sugar, alcohol, grains, legumes, soy, and dairy. As coffee is a plant-based beverage, it fits within these guidelines. However, it’s necessary to monitor what you add to your coffee. Many coffee add-ins like sugar, most creamers, and some flavorings are not Whole30 compliant.