The small intestine, I believe.
Nutrients are absorbed into the body along the entire length of the digestive tract, not only through the stomach or large intestine. Shortening that tract (as is done in bypass surgeries) only lessens the amount that can be absorbed by lessening the amount of surface the food goes through. Anal-administration of substances works because of this fact.
Water
There are several foods that contain a large amount of nutrients. The whole egg is one of the most common foods that contain the largest amounts of nutrients
Mainly in the small intestine. A small amount of absoprtion of nutrients can also take place in the stomach and large intestine.
disolved mineral nutrients are absorbed by the roots from the soil. carbon dioxide is absorbed directly from the air through the stomata in the leaves. oxygen is absorbed through the root system from pore spaces in the soil as well as a small amount through the stomata in the leaf.
There are various organs in the digestive system that have the function of breaking down the food that one person consumes, starting with the mouth, where teeth and saliva start the process needed to convert the food into the 'bolus', which then passes through the esophagus to the stomach, where more processing takes place, through the aid of gastric juices, finally, the processed food goes to the small and large intestine. It's in the small intestine where the nutrients of the food are absorbed into the blood.
Water and minerals require the least amount of digestion as they are absorbed directly into the bloodstream without needing to be broken down like carbohydrates, proteins, and fats.
It supposedly reduces the amount of carbohydrates that get absorbed in the digestive system by inhibiting the active transport of sugar into the body. I would consult a doctor or dietitian before using it.
The size of a sponge does affect the amount of water absorbed. The bigger the sponge the more water absorbed.
I think its vitamins....
Animals that digest roughage and thrive need to have large complex stomachs and digestive systems like cows or sheep where the food (roughage) can spend a long time, being broken down by enzymes and bacterial actions and the nutrients extracted. The digestive system of a chicken is not very big, it is designed for food that has nutrients ready to be absorbed. So any roughage in the digestive system will be eliminated from the body before any nutrients can be extracted. But roughage although not a very nutrient rich item for the chicken is good for cleaning out the digestive system, just like for people.
Most chemical digestion takes place in the duodenum (the first part of the small intestine).