Most of the fiber is insoluble, which is the type that's key for preventing constipation. Plus you get 6 grams of protein (about the same amount as in a large egg), and the cereal has no added sugars. In a 2013 review of high-fiber cereals, CR gave Grape Nuts top ratings for nutrition and taste.

Are Grape Nuts really good for you?

Grape Nuts are one of the healthiest cereals you can find. They do not contain any added sugar and are made with only four simple ingredients: whole-grain wheat flour, malted barley flour, salt and dried yeast.

Can grapes act as a laxative?

Being rich in antioxidants, grapes also reduce the harmful effects of LDL cholesterol. A well-known laxative, grapes are very effective in eliminating constipation. (The organic acid, sugar and cellulose in the fruit gives it laxative properties.)