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A high-glycemic snack in the last hour spikes your blood sugar, then drops it below where it started around 3am. That crash is why you wake hungry and reach for sugar all morning.
You have cut portions and skipped dessert. This is about timing, not amount.
When you eat something high on the glycemic scale, glucose floods your blood fast. Your pancreas answers with a large surge of insulin.
Insulin does its job and then some. It clears the sugar so aggressively that your glucose falls below where it began. The steeper the spike, the harder the fall. That overshoot is built into how insulin works.
That dip lands in the middle of the night, hours after you fell asleep. Your body reads it as a fuel shortage. It responds by ramping up the hunger signals for the next morning. You wake with appetite already switched on.
So the craving that hits before 9am is not new that morning. It was written by the snack the night before.
In controlled feeding studies on the glycemic index, high-glycemic meals drove blood glucose below the starting level several hours later and left people hungrier than a low-glycemic meal of the same calories. The rebound tracked the size of the initial spike.
Most of that work was done during the day, not the last hour. The overnight version is an extension of the same mechanism, so hold it as likely, not proven. What is solid is the spike and the rebound. The glycemic load you choose decides how hard both hit.
This is one of the more reliable patterns in nutrition science. The direction holds even where the exact numbers vary by person and food.
TONIGHT
If you are hungry in the last hour, do not reach for fruit, crackers, cereal, or anything sweet. Those are the foods that trigger the spike.
Eat a small amount of protein, fat, or fiber instead. A spoon of nut butter or a few nuts keeps glucose flat. Small is the other half. A handful, not a meal.
The glycemic load you put down in the last hour is the appetite you wake up fighting. Keep it flat tonight and the morning craving never gets written.
