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Skepticism is a good thing for any of those studies but I’d be a little surprised if it was found that Michigan didn’t hold a higher standard than was held back then. More likely it was a relative safe bet what the studies would find and therefore a safe investmentBut you left out this important part.
Both Beyond Meat and Impossible Foods have commissioned studies by academics or third parties that compare how their plant-based burgers or sausages stack up to beef or pork products.
In the 60s, the oil companies commissioned studies(meaning paid for them) as well by academics and even paraded them out in-front of congress claiming that lead in gasoline wasn't harmful to people.
I wouldn't put much stock in commissioned studies by for profit companies claiming their products are fine.