A banana may look like an ordinary snack, but its nutritional profile makes it surprisingly useful. Eating one daily can add carbohydrates, fibre, potassium and other nutrients to your regular diet. You might notice changes in your energy routine, digestion or fullness, depending on what your overall meals look like. But there is also a side of the banana habit that many people overlook. Portion, timing and individual dietary needs can all matter. Here are seven things to know before turning one banana a day into your 45-day routine.