How come weight is affected by calories, and not the weight of the food? If I eat a bag of candy, I will gain weight, but if I eat 4 apples, I won’t gain as much?
In: Biology
Our body doesn’t keep everything we eat.
When food passes through us, our digestive system filters all usable nutrients it can get out of the food you eat and keeps these in you. What is “usable” to our body changes with what your body needs at the moment. Children need plenty of special stuff to grow in large numbers like calcium for bones, iron and proteins for muscles.
We have a general need for other nutrients to keep our regular functions up, like vitamins, but what we always need plenty of is energy. Our body wants to take in as much energy as it can, there is basically no limit since before modern times, it was basically impossible for us to consume more energy than was unhealthy.
Any surplus energy that is not currently needed will be stored as fat, that way it adds weight to your body.
TL;DR Candy is mostly sugar and your body likes to keep sugar, apples contain a multitude of ingredients of which most just pass through you.
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