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      Lifestyle factors and reproductive health: taking control of your fertility

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          Abstract

          Approximately 10 to 15% of couples are impacted by infertility. Recently, the pivotal role that lifestyle factors play in the development of infertility has generated a considerable amount of interest. Lifestyle factors are the modifiable habits and ways of life that can greatly influence overall health and well-being, including fertility. Many lifestyle factors such as the age at which to start a family, nutrition, weight, exercise, psychological stress, environmental and occupational exposures, and others can have substantial effects on fertility; lifestyle factors such as cigarette smoking, illicit drug use, and alcohol and caffeine consumption can negatively influence fertility while others such as preventative care may be beneficial. The present literature review encompasses multiple lifestyle factors and places infertility in context for the couple by focusing on both males and females; it aims to identify the roles that lifestyle factors play in determining reproductive status. The growing interest and amount of research in this field have made it evident that lifestyle factors have a significant impact on fertility.

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          Most cited references141

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          Body mass index in relation to semen quality and reproductive hormones among 1,558 Danish men.

          To examine the relationship between body mass index (BMI) and semen quality among young men from the general population. Cross-sectional study. Danish young men were approached when they attended a compulsory physical examination to determine their fitness for military service. From 1996-1998, 1,558 (19%) young men (mean age 19 years) volunteered. Semen volume (in milliliters), sperm concentration (in million per milliliter), percentage of motile spermatozoa, percentage of spermatozoa with normal morphology, total sperm count (in million), and testis size (in milliliters). In addition, serum reproductive hormones were measured. Serum T, sex hormone-binding globulin (SHBG), and inhibin B all decreased with increasing BMI, whereas free androgen index and E(2) increased with increasing BMI. Serum FSH was higher among slim men. After control for confounders, men with a BMI 25 kg/m(2) had a reduction in sperm concentration and total sperm count of 21.6% (95% CI 4.0%-39.4%) and 23.9% (95% CI 4.7%-43.2%), respectively, compared to men with BMI between 20-25 kg/m(2). Percentages of normal spermatozoa were reduced, although not significantly, among men with high or low BMI. Semen volume and percentage of motile spermatozoa were not affected by BMI. High or low BMI was associated with reduced semen quality. It remains to be seen whether the increasing occurrence of obesity in the Western world may contribute to an epidemic of poor semen quality registered in some of the same countries. If so, some cases of subfertility may be preventable.
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            The role of sperm oxidative stress in male infertility and the significance of oral antioxidant therapy.

            Oxidative stress in the male germ line is thought to affect male fertility and impact upon normal embryonic development. Accordingly, fertility specialists are actively exploring the diagnosis of such stress in spermatozoa and evaluating the possible use of antioxidants to ameliorate this condition. In this review, evidence for the presence of oxidative stress in human spermatozoa, the origins of this phenomenon, its clinical significance in the aetiology of male infertility and recent advances in methods for its diagnosis and treatment are re-examined. Moreover, an extensive review of the results presented in published clinical studies has been conducted to evaluate the overall impact of oral antioxidants on measures of sperm oxidative stress and DNA damage. Administration of antioxidants to infertile men has been assessed in numerous clinical studies with at least 20 reports highlighting its effect on measures of oxidative stress in human spermatozoa. A qualitative but detailed review of the results revealed that 19 of the 20 studies conclusively showed a significant reduction relating to some measure of oxidative stress in these cells. Strong evidence also supports improved motility, particularly in asthenospermic patients. However, of these studies, only 10 reported pregnancy-related outcomes, with 6 reporting positive associations. Adequately powered, placebo-controlled comprehensive clinical trials are now required to establish a clear role for antioxidants in the prevention of oxidative stress in the male germ line, such that the clinical utility of this form of therapy becomes established once and for all.
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              Toxicity of chemotherapy and radiation on female reproduction.

              One of the most devastating consequences of cancer treatment in the young female population is ovarian damage, resulting in diminished fertility potential. The extent of damage is related to age, chemotherapeutic regimen, and dose of pelvic radiation received. It is crucial that physicians know the impact each of these factors has on future fertility to advice patients on fertility preservation options. Anticancer drugs injure the female reproductive system through ovarian follicular and stromal damage. Although the exact mechanisms of damage remain unclear, it is essential to better understand these mechanisms to develop methods to diminish ovarian injury.
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                Author and article information

                Contributors
                Journal
                Reprod Biol Endocrinol
                Reprod. Biol. Endocrinol
                Reproductive Biology and Endocrinology : RB&E
                BioMed Central
                1477-7827
                2013
                16 July 2013
                : 11
                : 66
                Affiliations
                [1 ]Center for Reproductive Medicine, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH, USA
                Article
                1477-7827-11-66
                10.1186/1477-7827-11-66
                3717046
                23870423
                77b4d2e9-4931-4136-b2ad-6679d74faa00
                Copyright © 2013 Sharma et al.; licensee BioMed Central Ltd.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 26 March 2013
                : 10 July 2013
                Categories
                Review

                Human biology
                Human biology

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