My mom used to force me drink milk as a kid, simply because she believed the dairy industry marketing and wasn't educated enough to know that vitamin D and calcium could be gotten from many, many other sources.

I have been extremely lactose intolerant since childhood, so those forced milk-drinking episodes were traumatic.

These days I get my calcium from dark leafy greens, sardines, and tofu. I get my vitamin D from sunlight and an easily absorbable vitamin supplement.