How can you increase your daily intake of fiber? 
The answer is simple. Eating a variety of grains (including cereals), fruits and vegetables will provide the best sources of complex carbohydrates in addition to soluble and insoluble fiber.

Benefits of Fiber:
Dietary fiber provides important health benefits, from preventing gastrointestinal disorders to promoting normal bowel function. Dietary fiber can also reduce blood cholesterol, help prevent childhood obesity, and lessen the risk of developing such chronic ills as cancer, cardiovascular disease, and adult-onset diabetes.

• To prevent future heart disease in children older than the age of two, experts recommend a diet with more complex carbohydrates and fiber and less cholesterol, saturated fat, and total fat.
  
• Obesity is rare in countries with high-fiber diets, but common in the United States and other Western nations, where fiber consumption is low.
  
• Dietary fiber helps prevent constipation, a frequent problem for American children and adults.
  
• In individuals with high-cholesterol levels, soluble fiber found in cereals, fruits and vegetables reduces levels of LDL ("bad") cholesterol.