Technicaly you can not be allergic to sugar. If you were allergic to sugar you would die. We get energy from sugar when it breaks down in our bodies.
If sugar makes you sick and feel drugged and slower the usual, this is called and Sugar intolerancy.
An intolerance to sugar can cause a resistance to insulin as well as rapid weight gain if ingested in large amounts. It can also lead to fatigue, joint pain, forgetfulness and confusion.
When defined Sugar intolerancy is when the sucrase and the enzyms in the small intestine are not made. Because they are not made thay can not metaboliz the sucrose which causes complications.
Symptoms of sugar intolerance range from nervousness and anxiety, to heart palpations or arrhythmias, to indigestion accompanied by bloating and flatulence.
If you think that you have a Sugarn Intolerancy you shoudl talk to you doctor right away to find a diet plan that can help you stay healthy and feel better.