Celulose. Some humans also cannot digest lactose aka someone who is lactose intolerant.
Humans cannot digest the carbohydrate cellulose.
its fiber.
fiber.
fiber
Cellulose
cellulose. humans do not possess the enzymes necessary for its digestion.
Cellulose is a complex carbohydrate found in plant cell walls that cannot be digested by any mammal (including humans). This is because mammals lack the enzyme which breaks the β(1,4) linkages found within cellulose.
Fibers belong to the class of carbohydrates. They are a type of complex carbohydrate that cannot be fully broken down by the body's digestive enzymes.
cellulose which is present in grass can be digested by ruminants but cannot be digested by humans
Complex answer: Cellulose is a polysaccharide that provides structural support for plants. Humans cannot digest cellulose. Thus, you cannot digest wood, which is mostly cellulose. :Simple answer Humans cannot digest the carbohydrate cellulose. Soures:AP biology class, Textbook :3
Fiber
Enzymes are involved in the digestion of all types of foods except, of course, the foods that cannot be digested (like cellulose).
Dietary Fibre cannot be digested easily by human intestines because of lackness of enzymes.
Because it is in a form which is already digested e.g honey. Honey is already digested by bees so it is far more easier for the human digestive system to absorb.
If you eat something that you cannot digest, it will pass through your digestive system and be eliminated in the form of excrement.Food that is not digested is expelled from the bowel in the stool.
It breaks down worn out organelles, because the cytoplasm cannot break down, for example, worn out mitochondria. It is also known as the "suicide sack" because it can release the acids within it if the cell is malfunctioning. It actually causes the cell to explode!
i have discovered that you cannot digest plastic. As me and my friend experimented it and ate different size plastic buttons 4 weeks ago and they have not digested because the enzymes in our intestine cannot break down the strong bonds in plastic.