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This depends on several factors. This answer uses Cowspiracy as a source, which in turn uses several reputable sources as source. I will state the sources of these sources in small under the quotes. If we look to the available land, a non-vegetarian uses approximately six times as much land as a vegetarian and 18 times as much as a vegan. Robbins, John. ...


9

According to the FAO report, crickets have a live weight feed conversion ratio of 1.7. This means 1kg of live cricket requires 1.7kg of feed. Crickets are approximately 80% edible, giving a feed-to-food ratio of about 2.1. According to the report, "this means that crickets are twice as efficient in converting feed to meat as chicken, at least four times more ...


7

The 2013-study "Redefining agricultural yields: from tonnes to people nourished per hectare" by Cassidy et al. from the University of Minnesota investigates this question. The authors state that given the current mix of crop uses, growing food exclusively for direct human consumption could, in principle, increase available food calories by as much as 70%,...


5

I did a report on vegetarianism in college, and back then-- when I had access to a university library-- I found that we would increase our global food supply by at least 40%, enough to sustain another 3 billion people. I can't find my source now, and most "What would happen if everyone went vegetarian?" articles focus mainly on climate change and the economy,...


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