Sometimes we feel like having a little sweet treat but when sometimes turns into a lot of times, you can really do damage to your body. Sugar is the single worst ingredient in today's diet. It can have harmful effects on metabolism and contribute to all sorts of diseases. Over time, because the calories from sugar aren’t fulfilling, this can translate into an increased calorie intake. Added sugars like sucrose and fructose do not contain any essential nutrients but add plenty of calories. There are no proteins, essential fats, vitamins, or minerals in sugar. And let's not forget what Moms and dentists have told us for years - sugar causes tooth decay by feeding harmful bacteria in the mouth.