It is quite simply objectively false. However, there are some factors that need to be taken into account. Farmland and crops that can be used for grazing are n

It is quite simply objectively false. However, there are some factors that need to be taken into account. Farmland and crops that can be used for grazing are not necessarily capable of producing anything fit for human consumption. Livestock can eat cellulose-heavy plants (grasses and shrubs and so on) and convert them to meat and milk, which we can then eat. The biggest problem then turns out to be cattle. We are eating way too much of it, it's an ineffective process and needlessly resource intensive. We should obviously grow food crops fit for humans where it's possible, but we should also convert to primarily chickens, pigs and other animals that are hardier than cattle and significantly less resource intensive to keep. Beef has an undeserved reputation for being fancy and higher class than other meats. Add this to the deleterious health effects of a diet high in red meat (generally specified as meat from ruminant animals), and I've personally cut beef almost entirely out of my diet. I prefer chicken, anyway.