Are bell peppers spicy? Bell peppers aren’t spicy, as they don’t produce capsaicin, the chemical that causes the burning sensation in your mouth when eating jalapeños or other spicy peppers. Green bell peppers are unripe red bell peppers and are less sweet. Red bell peppers are produced by allowing green peppers to ripen on the vine. Nutritional Benefits of Bell Peppers One cup of green bell pepper has just thirty calories, seven grams of carbohydrate, and almost three grams of fiber. The low carbohydrate count makes green bell peppers a great choice for those who have diabetes and need to