Generational differences in selenium status of women

Area of Science:

• Human Nutrition
• Biochemistry
• Endocrinology

Background:

• Selenium is an essential trace element vital for antioxidant defense and overall health.
• Estrogen levels naturally fluctuate throughout a woman's lifespan, influencing various physiological processes.
• Understanding nutrient status across different life stages is crucial for targeted health interventions.

Purpose of the Study:

• To investigate the impact of life-cycle variations on selenium status in women.
• To explore the relationship between estrogen levels and selenium status in different generations of women.
• To assess if dietary selenium intake differs across three generations of women.

Main Methods:

• Cross-sectional study involving three generations: daughters (19-26 yr), mothers (40-58 yr), and maternal grandmothers (67-84 yr).
• Analysis of plasma and red blood cell (RBC) selenium concentrations and glutathione peroxidase (GPx) activity.
• Calculation of typical dietary selenium intakes using food-frequency questionnaires.

Main Results:

• Selenium status was lowest in the oldest generation (maternal grandmothers).
• Plasma selenium was significantly lower in daughters and grandmothers compared to mothers.
• Plasma glutathione peroxidase (GPx) and RBC selenium were lower in grandmothers than mothers.
• A positive correlation was observed between plasma estrogen and plasma selenium concentrations (r = 0.42, p < 0.04).
• No significant differences in dietary selenium intake were found among the three generations.

Conclusions:

• Selenium status fluctuates throughout the female life cycle.
• Estrogen status is a significant factor influencing selenium status in women.
• Life-cycle changes, particularly hormonal shifts, impact selenium levels independently of dietary intake.