Pediatricians at UT Southwestern Medical Center say that probably doesn't do a lot of good because there's no real evidence that sugar causes hyperactivity. That doesn't mean sugar is good for children, though. It's empty calories without food value. Instead of sugary treats like candy or sodas, children would be better off snacking on nutritious foods like fresh fruit. Obesity is on the rise in children, and excess sugar can be a contributing factor.
Sugar also can cause tooth decay.
If your children seem more energetic after eating sugar, look beyond the sugar itself for the cause. A lot of times, the event at which sugary foods are served may be what causes the excitement. Birthday parties and holiday activities would make children excited even without sweets. Other substances in sweet treats also may have an effect on a child's behavior. Many sodas and chocolate also contain caffeine, which can make children jumpy and excited.