system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If I eat a difficult to digest food such as steak, then follow it with an easy to digest food like pineapple, which will be digested first and will I poo it all out at the same time?
gpt
Gastroenterologist here:

**Short answer**: Most of the Pineapple will be digested first. You will poo it all out at the same time. 


**Long answer**: Because steak is predominantly protein and fat - it is more fully digested compared to pineapple, which is predominately fiber, water, sugar (fiber not being digested).

A pineapple meal will actually move faster along the digestive tract - since water and sugar are rapidly absorbed and the fiber content helps to move the pineapple meal quickly along.

A steak meal moves more slowly along the digestive tract because it takes time to breakdown the fat and protein. Once broken down, the absorption of protein and fat are more complicated than simple sugar and water.

**tl;dr**: If you eat a pineapple immediately after eating a steak the two meals will be mixed together. The mixed meal will move slower than if you had only eaten a pineapple, and it will move faster than if you only ate a steak.