dwindle, decrease, reduce, decline, curtail, get hungry
減 centers on a gradual reduction in amount, intensity, or supply: dwindling, decreasing, or curtailing something. The sense of getting hungry is a natural extension of one's inner resources diminishing.
減 combines 氵 (water) with 咸, which likely contributes the sound and the idea of lessening or reducing. The water radical suggests something being diminished or drained away.
Water 氵 on the left and 咸 on the right: imagine a container of water slowly leaking out, the level dwindling and decreasing until you get hungry for more.
For ゲン, picture a general reducing his army's supplies: general -> ゲン, and the dwindling rations make the soldiers hungry.
to decrease (in size or number); to diminish; to abate
decrease; reduction; decline
degree; extent; amount; balance; state; condition
cut; reduction; curtailment
to abate; to decrease; to diminish; to shorten
abatement; reduction
irresponsible; perfunctory; careless
dramatic decrease; sharp drop; sudden fall
deceleration
reduction by half; halving
loss in weight (esp. body weight); weight reduction
decrease; reduction; fall; depreciation; mitigation
reduction (esp. in price or cost); diminution; abatement
tax reduction
increase and decrease; fluctuation
subtracting points; deducting points
decline; ebb; failure; decay; decrease; loss
reduction and exemption (e.g. taxes); mitigation and remission (e.g. in criminal law)
pay cut; salary cut
retrenchment; curtailment; economy
loss (of weight or volume, e.g. in transit); ullage; outage
fall; decrease (in income)
decrease in production
decrease in profits