Alice Evans's studies showed drinking unpasteurized milk could pass on Malta fever(a disease given to farm animals to humans). She wanted to pasteurize or get rid of all the Bactria in all the milk to prevent this.
If Alice didn't use her science to prove that the dairy products were not healthy, they would have made it the same way longer. There was bacteria called bacillus in the unpasteurized milk that wasn't being cleaned out well enough causing Malta fever.