I don’t think you get them from milk per se. I drink so much milk I actually need a cow in my front yard. So does the rest of my family and no one ever had them. Though it has been suggested that Northwestern Europeans have higher tollerance for lactose. Anyway Soda though, or any kind of suggery drink with all kinds of chemicals yes, those will definitely up the chance. Those drink are bad for you in every way and they mess up a lot organs. I never drink them, only milk, a lot of tea and fresh juice. Water remains best though, but tea is the next best thing.