Sustainability of meat-based and plant-based diets and the environment.
Worldwide, an estimated 2 billion people live primarily on a meat-based diet, while an estimated 4 billion live primarily on a plant-based diet. The US food production system uses about 50% of the total US land area, 80% of the fresh water, and 17% of the fossil energy used in the country. The heavy dependence on fossil energy suggests that the US food system, whether meat-based or plant-based, is not sustainable. The use of land and energy resources devoted to an average meat-based diet compared with a lactoovovegetarian (plant-based) diet is analyzed in this report. In both diets, the daily quantity of calories consumed are kept constant at about 3533 kcal per person. The meat-based food system requires more energy, land, and water resources than the lactoovovegetarian diet. In this limited sense, the lactoovovegetarian diet is more sustainable than the average American meat-based diet.
Pimentel
David
D
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA. dp18@cornell.edu
Pimentel
Marcia
M
D000818:Animals; D004032:Diet / Q000145:classification / Q000706:statistics & numerical data / Q000639:trends; D014676:Diet, Vegetarian / Q000706:statistics & numerical data*; D005523:Food Supply / Q000191:economics / Q000706:statistics & numerical data*; D006801:Humans; D008460:Meat; D011158:Population Growth; D014481:United States