You only lose stats if you are weak. You lose 1 stat each catergory each day you are weak or lower.
States of being:
Fit Exhausted Weak Skinny Bony Dying Dead
However: Day 1 (fit) eat 1 food point, drop to exhausted, no stat loss. Day 2 (exhausted) eat 2 food points, no stat loss. Day 3 (fit again) eat 1 food point, drop to exhausted, ect ect ect....
Eating 2 food points a day raises you 1 state of being. Eating 0 food points a day will drop you two states, eating 1 will drop you one.
Credit to anto_capone