After exercise, your body would have depleted your glycogen

"After exercise, your body would have depleted your glycogen storage to some extent, and it is hungry to use the sugar to replenish the glycogen stores. Eating sweet food at that time is unlikely to get the sugar stored as fat."
— Peak Human Clock

After you have engaged in physical activity, your body has likely used up its stored glycogen. Eating a sweet food afterward can help to restore these stores without causing excess sugar to be stored as fat.

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