hmm i don't think animals including humans can produce sugar, that's the purpose of plants. plants convert CO2 and water into sugar (glucose), which we eat, store in our body and chemically convert it into ATP energy. =\ unless mean something else like Diabetes.
sugar and starch
glucose
The inability for the body to process dairy products is known as lactose intolerance. This condition occurs when the small intestine doesn't produce enough of the enzyme lactase, which is needed to digest lactose, the sugar found in milk and dairy products. Symptoms may include bloating, gas, diarrhea, and stomach cramps after consuming dairy.
because there is too much sugar in the blood
eating to sugar. this is because the pancreas can not produce enough blood sugar for the body
" A metabolic disease in which the body's inability to produce any or enough insulin causes elevated levels of glucose in the blood. "
In plant cells, sugar is broken down to produce energy in the mitochondria, just as in animal cells.
Insulin
To produce digestive enzymes to be used in the intestines and to produce insulin to regulate the body's use of blood sugar.
Insulin, produced by the pancreas, enables the body to take up and use glucose sugar from the blood. Diabetics have an inability to take up glucose from the blood and can have high blood sugar, which is easily fixed by administering insulin.
When you don't have enough thymosin you develop hypo-thymosin, it results in the inability to produce a complete immune protection system
because the starches in it can help produce sugar in your body all starches do it