Do apples make you poop?
Maybe. Depends on your gut. Apples have three things that can get you going: fiber, sorbitol and more fructose than glucose. People who don't absorb fructose well feel it most.
Did apples make you go?
The meter says what should happen. Your bowels get a vote too.
Why it works
More fructose than glucose
A medium apple has about 6 g more fructose than glucose. Glucose helps the gut absorb fructose, so the extra can reach the colon and pull water with it, especially in people with fructose malabsorption.
A little sorbitol
A medium apple has about 1 g of sorbitol, the same sugar alcohol that makes prunes work, in a much smaller amount.
Decent fiber
The same apple has about 4.4 g of fiber, a solid chunk of the 22 to 34 g adults need a day.
Sources: Muir et al., J Agric Food Chem 2009; Fructose malabsorption review, Br J Nutr 2021; USDA FoodData Central.