"Woman trying to prove ‘vegans can do anything’ among four dead on Mount Everest"
(www.washingtonpost.com)
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Sorry, my point was food yield, for a cow you need about 1 acre (depends on state, but between 1.5 and 2 acres for 2 calves) you slaughter them at 3 years, if they are 1k lbs, you get around 430 lbs meat, so after 3 years 860 lbs meat.
1 acre can grow a good (not great) yield of 12k lbs kale in 1 year, so the same 2 acres over 3 years Is 72k lbs of kale which Is really nutrient dense and you would have to supplement, but you can't eat just meat either and would have to supplement.
You could compare calories and beef is about 4x calories, so just caloric intake you could get 840k calories in beef vs 16 million calories in kale.
Beef is harder to care for, requires more food and the end result would require more supplements to be healthy than kale for example.
This is my argument. And you can be completely healthy on a vegan diet but it is much harder and you have to do a lot of research, the meat and 3 kind of diet is generally easy and covers your bases but then you get things like type 2 diabetes (to much fat which goes from your liver to your pancreas we recently confirmed this in a study), and heart diseases (the studies I mentioned before).
Again I'm not a vegan, it is a hassle and I'm a big guy who would rather eat a cliff bar and a dinner instead of eating literally all day, but something unrelated Is I did this vegan diet while getting bloodwork every other day for about 35 days and all of my levels and organs were healthy and functioning properly. Did echocardiograms, pulmonary function scans, ekgs, full bloodwork labs, the entire gamut. My fiance has been a vegan for more than 3 years and drs always comment on how healthy she is and tell her to keep doing what she is doing though she doesn't get as thorough of tests as I do.
Another side note is that oreos are vegan, if you eat only oreos you will die of malnutrition while being a vegan, it's about eating what your body needs and knowing making a diet that includes all the weird plants seeds nuts that are scattered through the world to include them in your diet, idk if you could be a healthy vegan 50 years ago but we can do it now, and eat dirt on your veggies for b12 or take a supplement.
i don't think your beef vs kale comparison makes sense. the caloric value of a lb of kale vs lb of beef is far greater than 1:4. for starters, you can't digest kale. just because you get x calories of heat from burning kale doesn't mean your stomach can ignite the kale and absorb the heat...
then you kind of acknowledge this in a way when you say it's much harder to live vegan. it's not just nutritional research, it's calories and quality of calories. fat is good, sugar is bad. your statement of t2 diabeetus and heart disease is way off, all the modern research points to carbs as the cause of t2 and heart disease, not fat.
i don't think the world can support a vegan lifestyle nor do i think it should. the majority of the world does not have the resources or luxury of subsisting on organic grass fed nuts and beans nor should they want to. the strongest and healthiest of humans had/have easy access to high quality meat. some research goes so far as to suggest that human evolution and development was a result of gaining access to abundant meat and not kale smoothies.
at a meta level, it's easier to eat the animals that do all the work of digestion and nutrient accumulation for you. herbivores spend the majority of their time and energy eating. and not solving differential equations. it's basically why cows don't rule the world.