Creatures Caves

The C3DS Manual states:
"As a rule of thumb, a Norn with a high amount of glycogen, adipose tissue, and muscle tissue is a healthy, well-fed Norn."

Okay, that's logical enough. In your opinion, how high should these chemicals be? In C3DS, what are the ideals for a healthy Norn?

Aside from glycogen, muscle tissue and adipose tissue, what other criteria do you use in "scoring" the overall health of a Creature? What are your 'wellness' standards?

I find that most of my Norns maintain a healthy diet and have good eating instincts as children, teens and youths; when they reach adulthood, however, these abilities are lost. I have a feeling drive backup chemicals may have something to do with it, but I am having trouble making sense of it all.