Eli5 Why do our bodies behave so differently when it comes to food?

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For example as much as I eat I can barely increase my weight, while other people I know have to be super careful with what they eat to not gain too much

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4 Answers

Anonymous 0 Comments

The body is an amazingly complex biochemical machine comprised of many different tissues synchronizing and working together. This current age of food abundance is very unlike any other time in human history. Most humans really wanted to gain weight if possible. Those who had metabolisms that were too high may have starved. Now though those with metabolisms too slow suffer.

Long story short how fast or slow someone breaks down and processes food generally defines how their body deals with food consumption. People may have a higher or lower natural ability to process energy, waste, and harmful things their body comes in contact with.

Anonymous 0 Comments

Metabolism, and food type.

Long story short, ALL food comes down to calories (energy)

If you expend more energy than is needed, you lose weight.

If you gain more energy than is needed, you pack on fat.

Metabolism determines how much energy is needed and how fast.

Anonymous 0 Comments

Just like people have different heights, so do they have different *metsbolisms*, the rate at which the food and nutrients get used. Higher metabolism means burning through food faster, lower metabolism is the opposite, which leads to extra food being stored as fat.

Anonymous 0 Comments

Your body isn’t behaving differently, it’s your perception that’s different. If you’re eating more calories than you expend you will gain weight, if you eat fewer calories than you expend you will lose weight, if you eat the same your weight remains the same.

You don’t eat enough to gain weight, that’s it. You think you’re eating a lot but really you’re not. Maybe you have a big meal one day and think that’s a ton of food, but if you don’t eat much most of the time that meal doesn’t mean anything. Measure your portions, weigh your food, whatever you have to do to get an accurate log of what you’re really eating. Then eat exactly the same the next week, but with the addition of a six-ounce piece of chicken breast (raw weight) each day. “Suddenly” you’ll gain weight.

Metabolism isn’t really a thing, it’s all your current weight, how much you’re eating, and how much you’re expending.