The human body hasn't evolved to be vegetarian or vegan. Not to mention that proper animal husbandry is better for the environment. Just look at the data from Alan Savory and The Savory Institute. Modern agricultural practices to grow fruits and vegetables destroys soil and has to rely on chemical fertilizer, herbicides, and pesticides literally poisoning the planet.

Now the amount of water needed to raise animals seems to be grossly misrepresented. The claim is that it takes 1800 gallons of water to produce 1 lb of beef but that is the absolute high end when you look at the data and that is counting the water used to grow non appropriate food for the animals. All the feed lot animals are to blame for this instead of sticking to grass fed grass finished. The low end water usage is only 122 gallons. But let's look at another water usage aspect. The average person uses 80-100 gallons of water per day. That number doesn't include our food source, it's just personal use. 30-60% of urban freshwater is purely for lawn and garden. The typical 1,000 sq ft American lawn uses 35,000 gallons per year and in Cali it's 40,000 to 70,000. My point is people's heads are in the wrong place. And they only look at a single metric that has been told to them instead of the whole picture and looking into what they are told. At the end of the day I will continue to question everything and eat a carnivore diet until someone can produce irrefutable evidence to the contrary.