When you eat too much food, like when you have that extra cookie or finish all of your dinner and then ask for seconds, that's called overeating. It's not good to overeat all the time because it can make you feel stuffed, bloated, and uncomfortable.
Imagine that your tummy is like a balloon that can only hold a certain amount of air. When you eat more food than your tummy can hold, it stretches out - just like a balloon gets bigger when you blow more air into it. But if you keep doing that all the time, your tummy won't be able to go back to its normal size and can cause some unpleasant feelings like heartburn or stomach ache.
Eating too much food can also make you gain weight, which can be harmful to your body. Your body needs some food to give you energy, but when you eat too much, the extra food is turned into fat and stored in your body. Too much fat can make you feel sluggish, make it harder to move around, and can even lead to health problems like diabetes or heart disease.
So, it's important to take care of your tummy and eat just the right amount of food that it can hold. This will make you feel good and healthy, and you'll have more energy to play, run around, and have fun!