Billions of dollars have been invested by companies using precision fermentation to make "animal-free" dairy proteins in a factory. Around 40 companies are aiming to replace large parts of the dairy industry and they claim that their alt proteins behave in the same way in the human body as real dairy proteins. However, a recently published scientific study suggest that these animal-free proteins in fact don't. They may have a different effect on the gut and immunity. Meanwhile no alt protein company has been able to produce a single study that backs up their claim of equivalence to the natural dairy matrix.   Time: 16 minutes