Somebody was suggesting a drug which increase health and drain hunger. What if instead of just healing, it actually works a bit like the one with the sanity :
It increases the max health of the character and put you at full health. While it is active it drains hunger a lot but compensate by health regen. After a while you go back to your previous health state minus a percentage of what you lost while the drug was active.

Yeah I guess that sounds fine. I'll add it to the list then. What ingredients do you think it should use?

Good question. I'll think about it :-)