Introduction: The preconception period represents a critical window of opportunity for improving women's health before conception, as important stages of embryonic development occur in the first weeks of pregnancy, when a woman is often not yet aware of being pregnant. A healthy lifestyle, which includes a quality diet and regular physical activity, can contribute to reduced maternal and child morbidity and mortality. Purpose: The purpose of the diploma work is to examine the effects of diet and physical activity as lifestyle factors on the preconception period and pregnancy outcomes based on a review of professional and scientific literature. Methods: A descriptive method with a review of professional and scientific literature was used. The literature was searched in the DiKUL, PubMed and ScienceDirect databases. Slovenian and English literature published between years 2016 and 2026 was searched. Articles were selected based on content relevance, year of publication, language and availability of the full text. The literature selection process is presented with a PRISMA diagram, and all included studies were assessed for quality. Results: Eight studies were included in the literature review. The findings indicate that high-quality dietary patterns rich in fruits, vegetables and whole grains, as well as adequate intake of key micronutrients, are associated with a lower risk of gestational hypertension and gestational diabetes mellitus. Moderate preconception physical activity also reduces the risk of gestational diabetes mellitus and adverse pregnancy outcomes, whereas excessive exercise may decrease fertility. The protective effects of individual factors complement and accumulate. Nevertheless, data show that only approximately one-third of women achieve the recommended level of physical activity before conception. Discussion and conclusion: Diet and physical activity in the preconception period are important protective factors for maternal and child health. Dietary habits largely remain unchanged at the onset of pregnancy, which is why raising awareness is advisable before conception. The midwife plays a key role in this regard, as she can identify risk factors and encourage women to adopt a healthy lifestyle through a holistic approach. It is worth considering the systematic integration of nutritional and physical activity counselling, including micronutrients, into routine preconception care in Slovenia.
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