Water use

Summary

Plant foods use far less water than animal products, so shifting toward plants is one of the biggest ways to cut your dietary water footprint. The comparisons are stark: about 15,400 litres go into a kilogram of beef (~1,800 gallons per pound), roughly 5,000 litres into a kilogram of cheese, and about 628 litres into a single litre of cow's milk — versus roughly 48 litres per litre for oat milk and 28 for soy milk, with legumes, grains, and potatoes lower still. One honest refinement: most of beef's footprint is "green water" (rainfall on pasture), so in water-scarce regions the fairest comparison focuses on "blue water" (irrigation) — and even on that stricter metric animal products generally come out worse. A few plant foods (notably California almonds) have real regional irrigation footprints worth choosing around, but the overall gap isn't close.