After a little bit of googling, it seems that sugar allergy from ingestion doesn't exist. Intolerance is not allergies. I did find that there's apparently one

After a little bit of googling, it seems that sugar allergy from ingestion doesn't exist. Intolerance is not allergies. I did find that there's apparently one case of anaphylaxis caused by injection of fructose, though it wasn't the normal reaction referred to as allergies.