Glucose, if you're a diabetic with a rectal bleed.
cellulose which is present in grass can be digested by ruminants but cannot be digested by humans
Cellulose is the substance found in plants that cannot be digested by cows due to their lack of necessary enzymes. It is a complex carbohydrate that provides structure to plant cell walls but passes through the cow's digestive system without being broken down, making it a source of dietary fiber.
Olestra
Fiber is a complex carbohydrate that cannot be broken down by the body. It passes through the digestive system without being absorbed, providing bulk to stool and promoting healthy digestion. Consuming fiber-rich foods can help regulate blood sugar levels, lower cholesterol, and support overall gut health.
It comes out the other end.
No, your body cannot digest fiber. Fiber is a special type of carbohydrate that passes through the human digestive system virtually unchanged, without being broken down into nutrients.
Alcohol (ethanol) can diffuse from the digestive tract into the bloodstream without being digested. This is why alcohol can quickly enter the bloodstream and reach the brain, leading to its effects on the central nervous system.
Glucose
Minerals such as calcium, iron, and magnesium are absorbed in the gastrointestinal tract without being digested first.
water
Anaerobic Glycolysis
no it cant digest it just goes right through you