Levels 1 - 10
Grabbing whatever looks edible, hoping for the best.
Levels 11 - 20
Knowing the sweet from the poisonous with a single sniff.
Levels 21 - 30
Living off the land completely, no grocery stores needed.
Levels 31 - 40
Knowing every safe path and dangerous plant in the deep woods.
Levels 41 - 50
One with the ecosystem; plants seem to grow faster as they pass.