Consumo de cafeína e de alimentos-fonte de cafeína e prematuridade: um estudo caso-controle

Abstract

Caffeine (1,3,7-trimethylxanthine) is an alkali that easily crosses the placental barrier and can interfere in the growth and development of fetal cells and compromise fetal oxygenation. Considering the widespread consumption of foods containing caffeine in Brazil, the aim of this study was to evaluate the association between total caffeine consumption (including its food sources) and prematurity. A case-control study of 140 cases (newborns with gestational age less than 37 weeks) and 162 controls (newborns with 37 weeks gestational age or greater) evaluated caffeine consumption during pregnancy. Intake measurement used a semi-quantitative food frequency questionnaire based on the following foods: coffee, tea, and powdered chocolate. Total caffeine consumption (including food sources) during pregnancy was not associated with prematurity, and most intakes were less than 300 mg/ day. Caffeine consumption in the present study does not support guidelines against caffeine consumption by Brazilian pregnant women.

Social, Biological and Behavioral Factors Associated with Social Jet Lag and Sleep Duration in University Students from a Low Urbanized City

“…Stimulating caffeine-based drinks are responsible for increasing alertness and attention, providing decreased fatigue and drowsiness. 63 Therefore, this habit may have contributed to students increasing alertness and sleeping later in the week and this may have contributed to students presenting more regularity in the SWC due to the natural feature of sleeping later on the weekend.…”

Possible Adverse Reactions to Herbal Products: A Study with Individuals Who Resort To Popular Medicine in the City of Diadema, SP, Brazil

“…On the other hand, there might have been a concomitant ingestion of coffee within a short period of time, causing an overload of caffeine in her system. Studies point that food, such as coffee, tea, chocolate and sodas of the cola type, is responsible for the major sources of caffeine; moreover, it is also present in medicines (Souza and Sichieri, ). Another possibility is that the interviewee might be highly sensitive to this ingredient, to the point of feeling tachycardia with only the dose of a teabag, a fact that was reported in the literature we consulted (Boulenger et al ., ).…”