Start adding more fresh fruits and vegetables and whole-grain breads to your preschooler’s diet. According to a national survey, most toddlers don’t come close to eating enough fiber. Fiber helps discourage overeating, improve digestion, prevent constipation and protect against certain cancers, diabetes and heart disease. When researchers asked the parents of more than 5,400 children ages 2 to 5 what their kids ate over the course of two days, they found even the top fiber eaters still fell short of the recommended 14 grams of fiber for every 1,000 calories consumed. Unfortunately, kids’ main sources of fiber—applesauce, fruit cocktail and pizza—were less than ideal.