Body mass index, physical activity and fecundability in a North American preconception cohort study

McKinnon, Craig J.; Hatch, Elizabeth E.; Rothman, Kenneth J.; Mikkelsen, Ellen M.; Wesselink, Amelia K.; Hahn, Kristen A.; Wise, Lauren A.

doi:10.1016/j.fertnstert.2016.04.011

Cited by 74 publications

(98 citation statements)

References 50 publications

(68 reference statements)

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“…The characteristics of the included studies are shown in TABLE 1. Thirty-five studies were identified as prospective (Laurent et al, 1992;Florack et al, 1994;Windham et al, 1997;Caan and C. P. Quesenberry, 1998;Hakim et al, 1998;Jensen et al, 1998;Hull et al, 2000;Kesmodel et al, 2002;Arakawa et al, 2006;Law et al, 2007;Strandberg-Larsen et al, 2008;Bakker et al, 2010;Mook-Kanamori et al, 2010;Prabhu et al, 2010;Wise et al, 2010;Hatch et al, 2012;Mutsaerts et al, 2012;Wise et al, 2012;Bouwland-Both et al, 2013;van Uitert et al, 2013b;Wise et al, 2013, Gaskins et al, 2014bHahn et al, 2014;Radin et al, 2014;Van Uitert et al, 2014;Andersen et al, 2015;Hahn et al, 2015;Cueto et al, 2016;Gaskins et al, 2016;McKinnon et al, 2016;Sapra et al, 2016;Wesselink et al, 2016;Zhou et al, 2016;Parisi et al, 2017), six as retrospective cohort studies (Bolúmar et al, 1997, Axmon et al, 2000, Juhl et al, 2001, Juhl et al, 2003, Axmon et al, 20...…”

Section: Results Of Search and Description Of Studiesmentioning

confidence: 99%

“…The association between maternal lifestyle factors and time to pregnancy was evaluated in 19 studies (Florack et al, 1994;Bolúmar et al, 1997;Hull et al, 2000;Juhl et al, 2001;Juhl et al, 2003, Arakawa et al, 2006Axmon et al, 2006;Law et al, 2007;Ramlau-Hansen et al, 2007;Wise et al, 2010;Hatch et al, 2012;Mutsaerts et al, 2012;Wise et al, 2012;Wise et al, 2013;McKinnon et al, 2016;Sapra et al, 2016;Somigliana et al, 2016;Wesselink et al, 2016) (TABLE 3). Six studies evaluated the impact of smoking on time to pregnancy (Florack et al, 1994;Hull et al, 2000;Axmon et al, 2006;Law et al, 2007;Mutsaerts et al, 2012;Sapra et al, 2016), all showing a prolonged time to pregnancy among smokers.…”

Section: Time To Pregnancymentioning

confidence: 99%

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The impact of maternal lifestyle factors on periconception outcomes: a systematic review of observational studies

Oostingh

Hall

Koster

et al. 2019

Reproductive BioMedicine Online

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In this systematic review of observational studies, modifiable maternal lifestyle factors were found to influence several periconception outcomes. These data further support the importance of adopting healthy lifestyles of couples planning a pregnancy to improve reproductive health. ABSTRACTThe main risk factors for important reproductive health issues such as subfertility and perinatal mortality largely originate in the periconception period. To evaluate associations between modifiable maternal lifestyle factors and periconception outcomes, a systematic search was conducted for relevant studies published from 1990 to February 2017 on Embase, Medline, Web of Science, Cochrane database, PubMed and Google Scholar. The initial search identified 6166 articles, of which 49 studies were eligible for inclusion. Fecundity (the capacity to have a live birth) showed significant inverse associations with smoking, alcohol use and poor diet. Studies regarding time to pregnancy showed a decline in fecundity ratios (the monthly conception rate among exposed relative to unexposed couples) with increasing body mass index (BMI). Furthermore, risk of first-trimester miscarriage was found to be increased in smokers, alcohol and caffeine consumers, and with increasing BMI. Vitamin supplement use showed a decrease in this risk. This review demonstrates that maternal modifiable lifestyle factors affect periconception outcomes. If couples planning a pregnancy are more aware and supported to adopt healthy lifestyles during the periconceptional 'window of opportunity', short-term reproductive health as well as health in later life and even of future generations can be further improved.

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Section: Results Of Search and Description Of Studiesmentioning

confidence: 99%

Section: Time To Pregnancymentioning

confidence: 99%

The impact of maternal lifestyle factors on periconception outcomes: a systematic review of observational studies

Oostingh

Hall

Koster

et al. 2019

Reproductive BioMedicine Online

View full text Add to dashboard Cite

show abstract

“…In SF, total metabolic equivalent (MET)-hours per week were calculated using the International Physical Activity Questionnaire short-form by summing the MET-hours from walking, moderate physical activity, and vigorous physical activity (hours/week × 3.3 METs, 4 METs, and 8 METs, respectively) (22). In PRESTO, total MET-hours per week were calculated by multiplying the average number of hours per week spent engaging in various activities by METs estimated from the Compendium of Physical Activities (23,24). Potential confounders examined in the 2 cohorts were identical except for race/ethnicity (ascertained in PRESTO only) and educational level, which was ascertained differently across the 2 studies.…”

Section: Assessment Of Covariatesmentioning

confidence: 99%

Dietary Fat Intake and Fecundability in 2 Preconception Cohort Studies

Wise

Wesselink

Tucker

et al. 2017

American Journal of Epidemiology

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“…In PRESTO, total MET-hours per week were calculated by multiplying the mean number of hours per week spent engaging in various activities by METs estimated from the Compendium of Physical Activities (24). The values for the various activities have been published elsewhere (25). The potential confounders examined for the 2 cohorts were identical except for race/ethnicity (ascertained in PRESTO only) and education, which was ascertained differently across the 2 studies.…”

Section: Assessment Of Covariatesmentioning

confidence: 99%

Dairy intake and fecundability in 2 preconception cohort studies

Wise

Wesselink

Mikkelsen

et al. 2017

The American Journal of Clinical Nutrition

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Background: Animal studies have shown that a high intake of galactose, a breakdown product of lactose, increases ovarian toxicity. Few epidemiologic studies, to our knowledge, have examined the association between dairy intake and fertility, and they have had conflicting findings. Objective: We prospectively evaluated dairy intake in relation to fecundability among women who were planning for pregnancy. Design: Data were derived from preconception cohort studies in Denmark (Snart Foraeldre) and North America [PRESTO (Pregnancy Study Online)] in which women completed a validated food-frequency questionnaire 10 d after enrollment. The dietary intake of dairy foods and their constituents was calculated based on reported frequencies, mean serving sizes, and standard recipes for mixed foods. Outcome data were updated every 8 wk for 12 mo or until reported conception. Analyses were restricted to 2426 women attempting pregnancy for #6 cycles at study entry. Fecundability ratios (FRs) and 95% CIs were estimated with the use of proportional probabilities regression models adjusted for potential confounders. Results: FRs for total dairy intake ($18 compared with ,7 servings/wk) were 1.37 (95% CI: 1.05, 1.78) among 1126 Snart Foraeldre participants and 1.04 (95% CI: 0.78, 1.38) among 1300 PRESTO participants (pooled FR: 1.11; 95% CI: 0.94, 1.31). The elevated FR for total dairy intake among Snart Foraeldre participants was limited to milk consumption and found only among women aged ,30 y. There was no clear association between low-or high-fat dairy intake and fecundability in either cohort. Although there was little evidence of an association between dietary intake of calcium, potassium, magnesium, or vitamin D and fecundability, a greater consumption of phosphorus and lactose was associated with slightly higher fecundability in both cohorts. Conclusions: Associations between dairy intake and fecundability were generally small and inconsistent across cohorts. Our findings do not support the hypotheses that a greater consumption of high-fat dairy improves fertility or that a greater consumption of lactose or low-fat dairy harms fertility.Am J Clin Nutr 2017;105:100-10.

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Body mass index, physical activity and fecundability in a North American preconception cohort study

Cited by 74 publications

References 50 publications

The impact of maternal lifestyle factors on periconception outcomes: a systematic review of observational studies

The impact of maternal lifestyle factors on periconception outcomes: a systematic review of observational studies

Dietary Fat Intake and Fecundability in 2 Preconception Cohort Studies

Dairy intake and fecundability in 2 preconception cohort studies

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