d also add to learn about the glycemic index and
glycemic loads
of foods (glycemicindex.com) and learn to pick and eat foods with a lower
index. Every single food you eat is converted to glucose, the trick is eating those that don't spike your system. Proteins, good fats and the right fruits and veggies. (not unlike southbeach)
For instance, WaveRider mentioned fruits. Different fruits have different glycemic loads. For instance, apples have glycemic index of ~35-40, which is low.