Just my opinion but I think it would improve gameplay & feel more rational if Stamina behaved kind of like this;
No change to regen rate or Stamina pool size until Water or Food dropped to 50%.
Regen rate starts to slow down at Water = 50%, at Water = 25% regen rate is 1/2, at Water = 0% regen rate is 1/4
Stamina pool size starts to shrink at Food = 50%, at Food = 25% pool size has been reduced by ~25%, at Food = 0% pool size has reduced by 75%
Could change the pool size reductions to integer values to incentivize buying the Attribute that adds +10 to pool size.
Thoughts behind this are;
1) I'd prefer not to be constantly managing Food/Water. The oversaturation definately helps but still more micro-management than I'd prefer.
2) No impact until F/W drop to 50% helps w #1 and would also open up the choice to say take on a POI with F/W at 60%, still full size pool and fastest regen but also room to eat/drink for Health regen without as much 'waste'.
3) Just seems more rational to me. 2 hours after lunch I don't feel as if I only have a 1/3 of the energy I had right after eating. 4 hours after eating, if I've been working out or backpacking, yeah I'm real hungry, but not to the point of basically crawling, heh