As a diabetic with mildly high sugar (usually in the range of 99-105 before meals, 110 two hours after meal) I have discouvered that AFTER eating a candy bar, or some other sugar laden product like cake or pie, that my sugar lever actually goes DOWN, to around 80 - 90, and will remain so until my next meal. Why is that???
Dear Friend, greeting s from Chat Doctor . I think it is due to excess secretion of insulin .... at a time over loading glucose is not good you are straining beta cell s for more insulin .  You need to consume those foodstuff which will maintain glucose slow and in a constant rate . Like proteins and low glycemic index d foodstuff . Take more of fiber rich food like green leafy vegetables, fruits (not juices with sugar) sweets if u need to take . Those which are made up of artificial sweeteners or ask for sugar-free sweet s . Do exercise at least walk for an hour a day . Take the medications in time. All the best . And do contact for more queries . Thank s