Actually, none of us can survive on a plant-based diet. We cannot manufacture B12, and the so-called “plant-based” sources of B12, it turns out, don’t produce it in a form we can digest.
B12 is found in all animal products.
Additionally, although humans can manufacture taurine (only found in meat), not all of us can manufacture enough taurine. This is why some people get sick when they go vegetarian.
To survive on a vegan diet you need to artificially supplement B12 and possibly taurine. Period.
A diet that requires artificial supplementation is, by definition, unhealthy. And while the cost of vegan B12 supplements is low, when you’re already paying more for your food… Taurine supplementation, if you happen to be one of the people who needs it, is another added expense and hassle. A few vegans have also found it necessary to supplement carnitine, which is considerably more expensive. Oh, and most vegans don’t get enough calcium and end up with bone problems. Many are also Vitamin D deficient, especially if living at high latitudes, if dark skinned, or if religiously using sunscreen. And Vitamin D2 (plant derived) is not as easily absorbed as D3 (which ONLY comes from animals), so you need even more of it.
I personally cannot properly digest nuts. I react the way lactose intolerant people do to milk if I consume pistachios, walnuts, or pecans. Almonds are actively toxic to me. Hazelnuts mess with my brain.
Because I am on thyroid medication, I am not supposed to consume large quantities of soy, as it can make my thyroid worse, throwing off my dosage. I can have some, but I cannot use it as a major protein source. This is also true for trans men (the phytoestrogens intefere with testosterone therapy), cis men with low testosterone (same reason) and women with a family history of breast cancer (elevates risk). Excessive soy consumption has also been linked to early puberty in girls (Again, phytoestrogens) and reproductive/sexual problems in both sexes. Eating a bit of soy is fine, but tofu should not be used as a meat substitute except for the occasional meal.
This limits my access to non-animal proteins to beans and grains. If I was gluten intolerant as well (I’m not, but it’s in my family), it would be a real problem. The only dairy substitute available to me is rice milk (and rice causes many of the same problems environmentally as raising beef).
Oh, but it’s better for the environment, right?
In addition to the already-mentioned quinoa, we’re cutting down rain forest in Mexico to grow avocados. Rice production is almost as bad for the environment as factory-based beef production for similar reasons. Also, plant-based foods, esp. fruit and fresh vegetables, are more likely to end up being wasted.
Studies indicate that if we all gave up meat tomorrow, all 7 billion of us gave up animal products forever, the good side would be the reduction in antibiotic use and greenhouse gas emissions.
1.3 billion people would lose their jobs overnight. 1.3 billion. 987 of them are poor.
Another thing that Ban Eating Meat Tomorrow types forget is that veganism is not necessarily the most effective use of farmland.
The statement that if everyone switched to a vegan diet we would need a fraction of our current farmland assumes all farmland is created equal.
I suspect that a lot of this perspective either comes from city dwellers who have no clue about farming or from people in the US breadbasket where there is a lot of high quality farmland suitable for raising food for humans.
The last global census in 2008 said that at that time, if all 6 billion people went vegan, it would need 3,068,444,911 acres of arable land. At the time there was about 3,212,369,959 acres of arable land: That is to say land suitable for raising crops humans can eat.
However, we’re building on, or otherwise destroying, arable land at the rate of about 1% a year and the population has grown.
We literally do not have enough arable land to feed everyone a plant-based diet.
And there are parts of the world that have a worse proportion of arable land to land only suitable for pasture than the US. Scotland comes immediately to mind. People in these places would have to import most of their food. I’m not sure Iceland could survive without eating fish.
If we all gave up eating meat tomorrow many of us would starve. I’m not exaggerating or being alarmist.
I’m also not criticizing people who choose not to eat animal products (just please make sure you get the required nutrients).
I am criticizing the “I don’t eat animal products and nobody else should either” crowd. Because it’s not that simple.
Also, bluntly, vitamin B12 deficiency can cause mood disturbances and paranoia…
But again, if you have to consume artificial supplements for whatever reason (unless it’s a personal absorption issue) your diet is not healthy.
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