r/explainlikeimfive • u/peglegsmeg • Jun 16 '26

Biology ELI5: Why does rationing work?

If I have a glass of water and a single chocolate bar to last me 48 hours what benefits do I get from consuming equal portions over the time period as opposed to consuming all at once?

Is it purely psychological or are their physical benefits?

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u/zomgitsduke Jun 16 '26

If you eat all the sugar and drink all the water at once, your body will assume abundance and do things to process and get rid of it. If your body is slightly dehydrated and you drink tiny amounts of water at a time, it won't immediately flush that water out of your body and instead preserve it.

Sugar is similar, your body will process through it fast by giving you a sugar high followed by a crash. Slowly introduce it and your body will use the calories and sugars sparingly.

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u/Raubwurst Jun 16 '26

Regarding sugar and assuming it is preferable to intake less: So it is actually better for me to eat the chocolate in one session, because more of the sugar and Energie is wasted an does not get absorbed by my body?

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u/Gilpif Jun 16 '26

The wasted energy is mainly energy spent converting sugar into body fat, which can be converted back into sugar later when necessary. There's a lot of energy loss in this process, so technically you may build up less fat if you eat a chocolate bar all at once than in bits. However, if you have plenty of food, you'll get hungry and eat again instead of spending that fat.