Coffee is a beverage brewed from roasted coffee beans. Darkly colored, bitter, and slightly acidic, coffee has a stimulating effect on humans, primarily due to its caffeine content. It has the highest sales in the world market for hot drinks. Your morning coffee can help boost the production of insulin in your body which can further help regulate your blood sugar levels. Many studies state that coffee can especially help fight type 2 diabetes. 4. It can help boost your brain functions.