Insulin allows for the uptake of glucose into cells. High blood sugar can occur in patients with diabetes, because the pancreas does not release enough insulin. Giving treats to diabetes patients causes fluctuations in blood sugar levels and should be prevented. This is the reason why giving treats to patients with diabetes is discouraged. Though, not every animal is the same. Some patients remain stable when regularly given a treat. Always consult your veterinarian before giving treats to a diabetes patient.