The problem with so many yummy things that we put in coffee is that they are often loaded with added sugar and chemically-based preservatives. Even basic sugar substitutes can contain harmful additives. Artificial sweeteners can actually lead to weight gain as a result of changes to the gut caused by ingesting them (via Cleveland Clinic).
On the flipside, cinnamon is a naturally occurring spice. It's actually one of the most popular spices, second only to black pepper, and one of the best spices for your health (via MedicalNews Today). According to USDA, half of a teaspoon of cinnamon each day can improve blood sugar, cholesterol, LDL cholesterol, and triglycerides.
Like coffee, cinnamon has many health benefits including lowering blood sugar and protecting against cardiovascular disease, cancer, Alzheimer's disease, and multiple sclerosis. Combining cinnamon with your morning coffee boosts the protective perks and when you consume both on the regular, the health benefits continue to multiply.