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VU Research Portal VU Research Portal Pregnancy and maternal weight change van der Wijden, C. 2015 document version Publisher's PDF, also known as Version of record Link to publication in VU Research Portal citation for published version (APA) van der Wijden, C. (2015). Pregnancy and maternal weight change. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. E-mail address: [email protected] Download date: 26. Sep. 2021 Summary and general8 discussion R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 110 | Chapter 8 Summary and general discussion R1 R2 Pregnancy and maternal weight change is the central theme of this thesis. R3 Pregnancies, and especially those in which women gain weight excessively, are believed to R4 contribute to weight retention, and the subsequent development or worsening of maternal R5 overweight and obesity (1,2). In addition, excessive gestational weight gain contributes to an R6 increased risk of complications for mother and child during pregnancy, delivery, neonatal life R7 and to obesity in the offspring (3-11). R8 The underlying question of this thesis is ‘how gestational weight gain can be influenced and R9 the consequences thereof’. R10 R11 What did we find? R12 Firstly in chapter 2 evidence was gathered on maternal nutrition in the Netherlands resulting R13 in a narrative review. One of the conclusions was that no simple relationship exists between R14 extra energy needs in pregnancy and extra energy intake advised, and that a universal ‘one R15 size fits all’ advice regarding nutrition for well-nourished Dutch women cannot be justified. It R16 might be better to give a personalized advice. R17 Subsequently, in the New Life(style), a randomized controlled trial (chapter 3), the effects R18 were evaluated of individualized counseling regarding physical activity and nutrition in R19 pregnancy on gestational weight gain and retention as the primary outcomes. The counseling R20 intervention had neither an effect on gestational weight gain nor on weight retention at 52 R21 weeks postpartum. In both the intervention and the control group, women had gained on R22 average 11.3 kg from early to late pregnancy, and they were on average 1 kg lighter at 52 R23 weeks postpartum compared to 15 weeks of pregnancy. R24 Because the counseling intervention had no measurable effect on gestational weight gain we R25 further analysed the study population as a cohort and assessed in chapter 4, whether eating R26 style, as well as behavioral determinants (i.e. attitude, social norm and self-efficacy) were of R27 any significance for gestational weight gain. Interestingly, during pregnancy eating style was R28 unstable in 34% of all women. At first sight emotional eaters gained more weight in pregnancy R29 compared to restrained or external eaters. After hierarchical regression analyses none of the R30 eating styles was associated with gestational weight gain. R31 Attitude, social norm, and self-efficacy were not of any significance on gestational weight gain. R32 R33 Not only total weight gain is important, but also, from a public health perspective, what part of R34 this weight gain is attributable to an increase in maternal adipose tissue. Also of importance R35 is whether the increase in maternal adipose tissue is mostly of visceral or subcutaneous R36 nature. In chapter 5 the concurrent validity was estimated between three different proxies of R37 maternal adipose tissue: i.e. serum leptin, BMI and the sum of 4 skinfolds in pregnancy and the R38 R39 Summary and general discussion | 111 R1 postpartum period. Because of the high correlation between the three methods, all methods R2 seem to be equally suitable to estimate changes in maternal body fat during pregnancy and R3 the year thereafter. However, none of the three methods is capable of differentiating between R4 visceral or subcutaneous adipose tissue. R5 R6 In chapter 6 we analyzed in a longitudinal cohort study the relationship between lifestyle R7 factors and maternal weight change and pregnancy outcomes. Sedentary behavior, physical R8 activity, sleeping patterns and BMI at 15 weeks of pregnancy were not related to gestational R9 weight gain and pregnancy outcomes. Breastfeeding was not related to weight retention. R10 Smoking during pregnancy was related to less weight retention (-5.1 kg) and lighter babies R11 (-323 gram). We also found that many women quit smoking before getting pregnant (41% of R12 76), but that around 50% of them started again after having given birth. R13 Some women (9%) lost >5% of their weight before getting pregnant, possibly preparing R14 themselves to be fit for pregnancy. In our study the women who had lost weight, had more R15 weight retention 52 weeks after delivery (4.9 kg) and delivered heavier babies (377 gram), R16 compared to women with more stable weight before pregnancy. We cannot explain the latter R17 finding, i.e. the heavier babies. The higher weight retention might be explained by a larger R18 yo-yo effect in the women who had lost substantial weight before pregnancy. That is, they R19 returned to their weight from before losing weight before pregnancy. These results show R20 that one needs to extend the study period well beyond pregnancy (i.e. > 1 year) to study R21 relationships between lifestyle factors and maternal weight change and pregnancy outcomes. R22 Total physical activity ( with moderate-to-vigorous intensity physical activity being part of this) R23 and energy expenditure determine energy balance and therefore body weight. In chapter 7 we R24 studied the relationship between moderate-to-vigorous intensity physical activity (MVPA) and R25 body weight. Not surprisingly, we found that MVPA decreased during pregnancy. However, R26 in our study MVPA was neither related to weight gain in pregnancy nor to weight retention. R27 Perhaps such a relationship could not be established because the group of women had very R28 low levels of MVPA. Another explanation could be that gestational weight gain cannot be R29 influenced so easily, because of the physiological processes taking place during pregnancy R30 overruling external stimuli. R31 It is known, mostly from training intervention studies, that PA has an effect on hormones R32 related to energy homeostasis (12-14). Was there any effect of MVPA on these hormones R33 in pregnancy in our study group? The only significant difference between women with levels R34 of MVPA above the median, compared to women with MVPA below the median, was a lower R35 fasting insulin and BMI at 15 weeks of gestation. At no other point in pregnancy or postpartum, R36 significant differences were observed in hormonal markers between women with MVPA below R37 or above the median for MVPA. R38 R39 112 | Chapter 8 What did we learn? R1 In our study we approached the issue of pregnancy and maternal weight change from various R2 perspectives. R3 Most studies reporting on gestational weight change restrict themselves to pregnancy. R4 In our view, aside from weight change in pregnancy, weight change after and even before R5 pregnancy is important as well. Gestational weight gain itself might not be that important R6 for the development of maternal obesity and may be difficult to influence (15,16). Perhaps R7 maternal weight gain during pregnancy is more ‘fixed’ in order to ensure fetal development, R8 and cannot be changed much under ‘normal’ (body weight) conditions. The model for weight R9 change of calories-in, calories-out in pregnancy might thus be too simple. R10 The mother’s metabolism is modified from the beginning of pregnancy, independent of R11 lifestyle (17-19). It is known that during pregnancy the developing fetus demands more and R12 more nutrients. The placenta increases the production of Growth Hormone (GH) and of R13 Human Placental Lactogen (HPL) through pregnancy, leading to reduced insulin sensitivity R14 and therefore, to increasing maternal glucose levels, which finally lead to an increase in the R15 adipose tissue lipolytic activity (19). In the beginning the mother gains weight and maternal R16 adipose tissue increases (20,21). Cholesterol and triglyceride levels increase also during R17 pregnancy, with an increment in free fatty acids (FFAs) mostly near delivery (17-19). Those R18 FFA may easily cross the placenta to guarantee a constant supply of nutrients for the fetus. R19 Leptin, a hormone produced by white adipose tissue seems to be important in regulating R20 nutrition and the energy-consuming processes of reproduction, pregnancy and lactation R21 (22,23). In pregnancy, leptin sensitivity decreases and a state of leptin resistance develops R22 resulting in a stimulation of food intake and maternal energy storage (24-27). R23 But apart from the maternal effects of leptin, leptin might play a role in the fetal programming R24 via epigenetic variation (28,29).1 R25 R26 The effect of maternal weight change during pregnancy on early-life programming of the fetus R27 was not the topic of this thesis.
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