We start with glucose as our starting material for glycolysis and aerobic cellular respiration. However, remember that glucose is not the only source of energy that we have. When we eat we digest fats, proteins as well as other types of carbohydrates than glucose. So these have to be metabolized and rather than converted into glucose are fed into cellular respiration at different places.However, not only is glucose a common starting material, but for some cells in our body it is the just about the only starting material. A good example is the brain. A significant drop in blood sugar levels can be fatal to the brain because the brain does not store carbohydrate and cannot fall back on either lipids or amino acids as energy sources.
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pgd revised 02/20/00