All youth need calcium to build peak (maximum) bone mass during their early years of life. Low calcium intake is one important factor in the development of osteoporosis, a disease in which bone density decreases and leads to weak bones and future fractures. Women have a greater risk than men of developing osteoporosis. During adolescence and early adulthood, women should include good food sources of calcium in their diets This is when bone growth is occurring and calcium is being deposited into the bone. This occurs in women until they are 30 to 35 years of age. Women 25 to 50 years of age should have 1,000 mg of calcium each day, while women near or past menopause should have 1,200 mg of calcium daily if they are taking estrogen replacement therapy; otherwise, 1,500 mg per day is recommended. Women older than 65 years of age should have 1,500 mg per day.
In addition to death occurring in pregnancy and childbirth, pregnancy can result in many non-fatal health problems including obstetrical fistulae, ectopic pregnancy, preterm labor, gestational diabetes, hyperemesis gravidarum, hypertensive states including preeclampsia, and anemia.[34] Globally, complications of pregnancy vastly outway maternal deaths, with an estimated 9.5 million cases of pregnancy-related illness and 1.4 million near-misses (survival from severe life-threatening complications). Complications of pregnancy may be physical, mental, economic and social. It is estimated that 10–20 million women will develop physical or mental disability every year, resulting from complications of pregnancy or inadequate care.[39] Consequently, international agencies have developed standards for obstetric care.[52]

The authors’ contributions were as follows—ELF and CD: were involved in the acquisition of the data; ELF, CD, SMD, and JF: were responsible for the interpretation of the data; ELF: wrote the paper and had primary responsibility for the content; CD, SMD, WS, and JF: were involved in providing detailed comments and revising the manuscript for important intellectual content; and all authors: were involved in the conception of this review and read and approved the final manuscript.
In addition to diet, exercise and other lifestyle factors can also play an important role in bone health. Smoking and drinking too much alcohol can increase your chances of developing osteoporosis, while weight-bearing exercise (such as walking, dancing, yoga, or lifting weights) can lower your risk. Strength or resistance training—using machines, free weights, elastic bands, or your own body weight—can be especially effective in helping to prevent loss of bone mass as you age.