Say No

to sugar before any exercise!

The tidbit below is from here:
Sugar is absorbed into the bloodstream within minutes. Consuming large amounts of sugar prior to exercise can actually inhibit performance. This produces a drastic increase in blood sugar. This causes the pancreas to secrete large amounts of insulin to metabolize the sugar. All this insulin inhibits the metabolization of fat by the muscles. Therefore, the muscles rely more on glycogen, which is in limited supply. The insulin reduces blood sugar level, which is already being reduced by the muscle utilization of glycogen stores for energy production. The blood sugar level reduces to a level, which may not only cause fatigue but dizziness as well. Therefore consumption of excess sugar prior to exercise reduces performance and endurance.