Natural juices are rich in fructose, unlike water or low fat milk, according to Dr. Richard Johnson from the University of Florida College of Medicine. Researchers believe that fructose may trigger obesity for humans.
Some natural juices have larger amounts of sugar than sodas. For instance, apple juice has more fructose than a soda, said Havel. A cup of apple juice has twenty more calories than the same amount of soda, according to the Department of Agriculture Nutrient Data Laboratory.
High-fructose corn syrup or fructose may lead to high levels of uric acid in the body. Dr. Johnson and his research team showed in a previous study on lab mice that a high-fructose diet leads to insulin resistance and the body produces more uric acid. Glucose does not cause the same problems, said Johnson.
Too much natural juice may also increase the children`s risk of bone fractures, affect their taste for other foods, or lead to cavities, said Vasanti Malik, doctoral student at the Harvard University School of Public Health.
Children who are active may have sports drinks after exercising because these beverages contain less fructose than juices or sodas. Children should have about six ounces of fruit juice per day, according to Johnson. Studies proved that children who consume more than twelve ounces of juice per day have a weight above average, said Johnson.
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