Protease enzymes are doing most of the work during the process of Maxwell's digestion. These enzymes breakdown peptide bonds of proteins which make food digestible. Chicken breasts mostly contain protein nutrients that are broken down by the enzyme and then absorbed well within the body hours after the intake.
On the average, about 25% of a teenager's total daily energy intake comes from snacks, this number is quite high, since the intake of other foods, such as proteins, vitamins and micronutrients are affected, unbalancing growth and developing diseases in young people.