- That raw milk contains lactase which is destroyed in the pasteurisation process
- That raw milk contains bacteria (or probiotics) that produce lactase and these bacteria are destroyed in the pasteurisation process.
Example (emphasis added):
Our products have what Mother Nature intended, a diversity of good bacteria and a wide range of essential enzymes including lactase for lactose digestion and phosphatase that is essential for the utilization of calcium.
One reason raw milk is so much easier to digest compared to pasteurized milk is due to the presence of lactase, the enzyme that breaks down milk sugar and which many humans are unable to produce. The experts I have spoken with deny the presence of lactase in raw milk; however, it is the friendly bacteria in raw milk that facilitate the creation of lactase in the intestine where it is needed. That is why lactose-intolerant people can drink raw milk without a problem. Pasteurization kills these friendly bacteria. source
The conclusion of these two specific "pro raw milk" arguments is the same, pasteurised milk contains no lactase, and this does seem to be backed up scientifically. However, I am skeptical that raw milk does contain lactase or that raw milk contains lactase-producing bacteria.
So, does raw cows' milk contain lactase or bacteria that could produce lactase in sufficient quantities for it to have any impact on human digestion of milk?
If it does contain lactase-producing bacteria, what is this bacteria and where does it originate from?