How weight is gained in human body??
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Your body basically runs on sugar the same way that your car runs on gasoline. Your car has a storage tank that you fill up with gasoline, and as it runs empty you have to constantly refill it. Your body is a little bit cleverer than that. Instead of having to worry about running out of fuel, it sets a little aside whenever there is excess. That storage system is called fat. It’s much more efficient (by volume) to store all that extra sugar as fat, but it is a little more difficult to use for energy than sugar is. So your body uses all the sugar first, and then starts taking fat out of storage and using that. In the car analogy it would be like if you filled your tank every day and your car converted any gasoline you don’t use into coal overnight. The next morning, you fill up your tank again and the gasoline is used first, and only once its gone does the coal get used.
Over time, if the amount you eat consistently exceeds what you are using, enough sugar will be converted to fat and stored that you will start to gain weight. Conversely, if your energy needs consistently exceed what can be powered by the food you eat, then you will lose weight (yes yes I know its more complicated, because gaining fat is metabolically easy and losing it is opposed by a number of hormone control systems, this is overly simplified for ELI5, and not diet advice).
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