When you have diarrhea, what portions of the food is excreted? Does only the poisoned portions become excreted or do the whole stomach contents get excreted?
Here is a practical example: For your post workout shake, you blend whey protein with milk. You did not know the milk was expired. After drinking the shake, you get a stomach ache and have diarrhea. What exactly was excreted in the diarhea? Did only the milk get excreted and not the whey? Or did both get excreted? In the latter case, one would need to eat more protein, but in the former case, you don't need to worry because the protein is still in your system.