Yes eating bananas does help you poop.
Bananas are rich in fiber which helps to get your bowels moving and so when you eat enough bananas you will poop soon after.
Eating a banana everyday such as for breakfast can help keep you from becoming constipated and help keep you pooping which keeps your colon clean.
Having a clean colon helps prevent colon cancer.
However you should still get tested for colon cancer by age 50 years old just to be safe.
Also using colon cleanse can also keep your colon clean.
Bananas are a good source of energy and are a great healthy snack as bananas are packed full of vitamins, minerals and nutrients as well as potassium.