Fiber plays an important part in your digestive health and overall wellness. A healthy diet consists of 25 to 38 grams of fiber a day depending upon your age and gender. If your diet is lacking sufficient fiber, your digestive system may not be working as well as it should. That could mean that you face problems with (scary word warning) irregularity. If you are irregular, you might feel bloated, heavy, or sluggish and lacking energy. How can I help my body work better? That's an easy one: With the All-Bran 10-Day Promise™. One serving of your favorite Kellogg's® All-Bran® cereal a day provides up to 51% of your daily value of fiber. That fiber cleanses your system, helping you feel lighter, happier and more energetic.