A simple answer to this question is NO. Milk cannot lead to weight gain, in fact, it can help you lose some. Milk is healthy and a source of high-quality protein, a nutrient required for muscle building and muscle growth. It also contains a fair amount of nutrients like zinc, magnesium, calcium, vitamin B12 and vitamin D. These nutrients can help to strengthen your bones, boost immunity and increase metabolism. 250 ml of milk contains 8 g protein and 125 mg calcium. So, there is no harm in consuming milk in limited quantity daily even if you are on diet.