Buttermilk is a good drink in summer. It has countless health benefits. 100 ml of buttermilk contains 40 calories. Buttermilk is lower in fat and calories than milk. It is a good source of protein and calcium. Buttermilk contains some sodium, potassium, phosphorus, and vitamins. Buttermilk contains calcium, protein, vitamin B12, vitamin D, and good bacteria. So it is the best choice for those who want to lose weight.