• Farahnaz Mardanian, Masoomeh Goodarzi-Khoigani, Seyed Saeed Mazloomy Mahmoodabad, Mohammad Hossein Baghiani Moghadam, Azadeh Nadjarzadeh, Awat Feizi, Zahra Allameh, and Sajedeh Molavi.
• Department of Obstetrics and Gynecology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
• J Res Med Sci. 2021 Jan 1; 26: 93.

BackgroundFollow-up studies have shown an increased risk of thyroid dysfunction in individuals with normal serum thyroid-stimulating hormone (TSH) levels. Furthermore, the possible consequences of minor differences in thyroid function (without achieving poor thyroid function) in the risk of weight gain during pregnancy are questionable, too. The production of TSH is under the hypothalamus-pituitary control, and food is one of the most effective environmental agents that control hypothalamic-pituitary-thyroid axis activity. Regarding the few available studies, we assessed the association of minor variations of TSH concentrations and nutritional status in the first trimester of pregnancy.Materials And MethodsThis cross-sectional descriptive and analytical study was performed on 150 primiparous healthy women. Demographic and family characteristics were collected using a researcher-administered questionnaire. Nutrients intake were extracted from a 72-h recall, and physical activity scores were determined by the pregnancy physical activity scale.ResultsThe prepregnancy body mass index (BMI) (β =0.022, P = 0.004) and participants' weight at 6-10 weeks of gestation (β =0.006, P = 0.024) were positively associated with TSH concentrations, while total physical activity score was negatively correlated (β = ‒0.006, P = 0.047). We did not find any significant association between TSH values and energy-adjusted nutrients intake (P > 0.05).ConclusionWe suggest that differences in TSH concentrations within normal range in the first trimester are correlated with gaining weight, physical activity level, and prepregnancy BMI. TSH concentration and consequently thyroid function may influence on gestational weight gain or vice versa.Copyright: © 2021 Journal of Research in Medical Sciences.

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