When you start cutting back on sugar, it’s easy to put all carbs or sugars into one basket. But my guest Dr. John Lewis, a nutrition scientist, explains why that basket is too big. John looks at sugars by where they come from and how they are built. A simple sugar is a single molecule. A disaccharide has two molecules, like sucrose (white sugar). Polysaccharides, the kind he has spent years researching in aloe and rice bran, are long chains of sugar units linked together. An...