For reference, 1 lb (454 g) of beef requires between 3800 L and 9500 L of water. This implies a typical beef restaurant "value meal" demands on the order of 10000 L of water.
Another important point is that fresh water is neither created nor destroyed, although entropy leads to more energy being required in the entire supply chain for its consumption and in external systems to treat/move/reclaim water for other purposes (increased competition / water prices).
There's also pesticide and fertilizer runoff, deforestation and reduced rainfall (Brazil) and antibiotic resistant, pandemic disease emergence (swine flu).
Another important point is that fresh water is neither created nor destroyed, although entropy leads to more energy being required in the entire supply chain for its consumption and in external systems to treat/move/reclaim water for other purposes (increased competition / water prices).
There's also pesticide and fertilizer runoff, deforestation and reduced rainfall (Brazil) and antibiotic resistant, pandemic disease emergence (swine flu).