Researchers have linked dietary data from over 55,000 individuals with data on the environmental impacts of the foods they eat. The team, from the Livestock, Environment and People (LEAP) project at the University of Oxford, found that the dietary impacts of vegans were around a third of those of high meat eaters. They also saw a 30% difference between high- and low-meat diets for most of the measures of environmental harm.
What I meant by that is some people don’t know how to eat a balanced diet. If someone suddenly decides they are vegan and doesn’t learn how to eat correctly (e.g. they start eating nothing but noodles and bananas), they could run into trouble.