Conservation of digestive enzymes.

@article{Rothman2002ConservationOD,
  title={Conservation of digestive enzymes.},
  author={Stephen S. Rothman and Charles Liebow and Lois Isenman},
  journal={Physiological reviews},
  year={2002},
  volume={82 1},
  pages={
          1-18
        }
}
The traditional understanding is that an entirely new complement of digestive enzymes is secreted by the pancreas into the small intestines with each meal. This is thought to be necessary because, like food itself, these enzymes are degraded during digestion. In this review we discuss experiments that bring this point of view into question. They suggest that digestive enzymes can be absorbed into blood, reaccumulated by the pancreas, and reutilized, instead of being reduced to their constituent… 

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