In short, there is no need to unless you have cow’s milk protein allergy. According to the NHS website milk and dairy products can form part of a healthy, balanced diet. Milk, cheese and yogurt provide a range of nutrients which contribute to health including protein, calcium, and potassium. For example, a 200ml glass of semi-skimmed milk provides 35 % of calcium, 44 % of iodine and over 100% of vitamin B12 of an adults recommended daily intake. In young children, the fat in whole milk can provide calories and the essential fat soluble vitamin A.