Yes, Fiber One bars can be a healthy snack if you enjoy them in moderation. Depending on the variety you choose, the bars can be fairly low-calorie or a good source of protein. They're also a tasty way to increase your fiber intake, a dietary requirement many adults don't get enough of. Current research suggests dietary fiber helps lower cholesterol levels, may help regulate blood sugar and is essential for digestive health. Moderation is important because Fiber One bars contain added sugars, a source of energy with no nutritional value.