@watertrain
There is a little known condition called Fructose Intolerance:
"Fructose malabsorption, formerly called dietary fructose intolerance, occurs when cells on the surface of the intestines aren't able to break down fructose efficiently. Fructose is a simple sugar, known as a monosaccharide, that comes mostly from fruit and some vegetables."
and
"People who have fructose intolerance should limit high-fructose foods, such as juices, apples, grapes, watermelon, asparagus, peas and zucchini."
If you have Fructose issues, eating things like grapes will result in Fructose being carried into your bowel, and sugars in your bowel make you poo... rapidly and often with a lot of gas.
Sugars, natural or artificial, in your colon and you will poo.... soon. This is true of indigestible natural (Sorbitol, Fructose for some) or synthetic sugars like Lactulose. It works whether given by mouth or enema (Molasses, Mayo (sugar and soda), honey, etc)