You are losing calcium. If you decide to give up dairy products, then you need to think about another source. Cabbage, parsley, rose hips, sesame seeds, almonds, canned sardines are rich in calcium. salmon and mackerel
Nothing. I do not like milk and practically do not use its derivatives (except for cheese from time to time, in small doses, as an addition to wine). For about 25 years of such a life, my body not only did not bend, but also successfully multiplied.