Question: what is the difference between the curd and buttermilk?
Answer: The difference between curd and buttermilk NOT is dilution. Buttermilk is the liquid left behind after butter is churned out of curd. When the butter is taken out, buttermilk is easy to digest, whereas curd is not. Since curd is not easy to digest, it is a misconception that it 'cools the body'.