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According to a 2013 report by the Institution of Mechanical Engineers, it takes about 15,000 litres of fresh water to produce one kilogram of beef, compared to 287 litres needed to produce a kilogram of potatoes.

I don't trust the science behind the vegetarian movement because the believers have agendas beyond nutrition. Some vegetarians are in the lifestyle to protect animals, some want to address climate change, and all are partially blinded by the cognitive dissonance that comes automatically with any lifestyle choice.