This week: A dive into lactose intolerance.
It's disappointing that you don't discuss the animal suffering that is required for the production of milk. A dairy cow will be forcibly impregnated, have her calf taken away from her (often within 24 hours), and then be milked regularly, before being killed when she is no longer profitable and well before the end of her natural lifespan. Not to mention that selective breeding has worsened their health and wellbeing so that they produce more milk. As you say, milk is a good source of calories and nutrition, but there isn't anything in it we can't get from plant-based foods, so our continued exploitation of dairy cows for this product is unjustifiable.
Given that more people than not are unable to digest lactose, the correct term for people who are unable to do so ought to be "lactose normal." Humans are the only who continue to consume a product meant for babies of other species into adulthood, which wasn't intended for us anyway. As such, the negative connotation around being labeled lactose "intolerant" is undeserved.