Beware of juice extractors that discard a fruit's fiber. White grape juice is easiest for babies to digest, says leading researcher Fima Lifshitz, M.D., Miami Children's Hospital. Certain juices can cause diarrhea, even restlessness and irritability in infants and young children who cannot properly digest absorb juices' carbohydrates, mainly sorbitol. Dr. Lifshitz advises introducing juice at 6 to 9 months of age. He also recommends limiting juice to no more than 4 ounces a day under age 2 and no more than 8 ounces a day between ages 2 and 4.
Juices can be a concentrated source of calories.
However, one Yale University study suggested that fructose, a sugar in fruit, actually stifled appetite, more than compensating for increased calories in fruit juice. But other research finds that eating an orange suppresses hunger better than drinking orange juice. Fruit and vegetable intake in relation to risk of ischemic stroke. 1233-9 and Inhibition of mammary cancer by citrus flavonoids. Pineapple juice Jeanne Freeland-Graves.