The different physical and/or chemical properties within the various types of protein may affect the rate of protein digestion.

Newborns of mammals are exceptional in protein digestion and assimilation in that they can absorb intact proteins at the small intestine.

The lowering acid level itself can make symptoms similar to gastroesophageal reflux disease, and hinders protein digestion by holding back the enzyme pepsin.

Papaya contains the enzyme papain, used in meat tenderizers and useful in protein digestion.

When excess food is available, they produce more waste and faeces, partly due to incomplete protein digestion.

Pepsin also undergoes feedback inhibition; a product of protein digestion slows down the reaction by inhibiting pepsin.

The leaves are thought to be low in tannins and other secondary metabolites which hinder protein digestion, making them an ideal food before the mating season.

If we break down the spice, we can set up protein digestion.

Gastric juice in the stomach starts protein digestion.

Lys-N is becoming a popular protease used for protein digestion in proteomics experiments.