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All of them are healthy. Although you may want to define healthy.

Well, all the vitamins and minerals, which are also in real meat, for starters.

And GMO soy leghemoglobin, plus soy leghemoglobin soy protein.

They don’t belch hundreds of pounds of methane into the air, which helps.

Well, that's definitely correct. But they do require soy, GMO soy to be precise, and monocropping is harmful, while on the other hand, cows are grazing animals, which can have a dramatic effect on the fertility of the land.

That aside, I don't believe there's a study about the environmental effect of the manufacturing of this sludge vs eating real foods.

And as an aside, the emission from cows is not as simple as it sounds: https://www.farmcarbontoolkit.org.uk/news/methane-myth-why-c...