Sometimes, Bi Bi is too lazy to eat. Uncle Da often complains:

I'm so hungry, give me something to eat! But when a spoonful of porridge comes in, his stomach squeezes it and pushes it out right away. Like that, Bi Bi's stomach is always starving because she doesn't eat much. The stomach thinks of a way to fight hunger: curl up. Every day the stomach shrinks a little, and soon it becomes smaller. Seeing that Bi Bi doesn't like to eat, Grandpa has to find a way to make Bi Bi eat well. A healer near the house comes to see her, then does acupressure and rubs Bi Bi's feet. The healer says she needs to drink grapefruit juice for easy digestion. Grandpa follows his instructions carefully. Sure enough, Bi Bi gradually enjoys eating more and more. Then there comes a time when Bi Bi eats too much. Whether it's rice, porridge, bread, sticky rice... Bi Bi eagerly eats. The mouth, throat, and esophagus are all excited, enthusiastically delivering food to the stomach. At first, the stomach is very happy, it takes a bite, trying hard to contract. Then the stomach stops, no longer taking any more food. The esophagus asks in surprise:Why did you close the door so fast? I still have to deliver the food!I'm so full, I can't take any more!You usually take twice as much as this amount.Back then, you were still big. Now, you are only half the size you used to be! Even though it closes the door quickly and doesn't take any more food, the stomach is still full. It swells, stiffens, and can no longer contract. So the stomach also becomes hard and stiff. Grandpa is so worried that he goes to the doctor and buys anti-digestive medicine and salt for Bi Bi to drink. The army of medicine has a hard time getting inside the stomach, helping it get rid of food. Feeling a little empty, the stomach tries to contract. "Oops... oops...," the stomach squeezes harder and harder. Food is scattered around inside. Some food goes back up the esophagus, through the throat and out! Bi Bi has a runny nose and tears. The stomach breathes a sigh of relief:Not having food is also miserable. Having too much is also painful! Luckily I got it out! As soon as he finishes speaking, Mr. Da is nudged hard by Mr. Gan and Ms. Mat:I'll get back at you, I was waiting for the bile to enter the digestive system, now you expel it all and there's nothing left for me to work on... I'll just shrink this way! As they say, both the liver and gallbladder shrink on their own. Meanwhile, Bi Bi eats deliciously. Food is always sent to the stomach. But the stomach, liver and gallbladder agree to no longer take much food, but only a little. One time, being pushed back so hard, the food rushes up Bi Bi's nose. After a while of discussion, the stomach, liver, gallbladder, esophagus, mouth... agree to only take a small amount of food. Bi Bi gradually becomes thinner. The doctor tells Grandpa to feed Bi Bi over many meals. So Bi Bi eats up to eight meals a day. The digestive army includes the mouth, throat, esophagus, stomach, liver, bile, pancreas... working rhythmically, making food fully digested, the stomach, liver, bile gradually become stronger and return to normal size. Bi Bi eats better and more regularly. And then, Bi Bi gradually gets fatter...