Preconception caffeine metabolites, caffeinated beverage intake, and fecundability

Area of Science:

• Reproductive Health
• Pharmacology
• Epidemiology

Background:

• Caffeine is a widely consumed psychoactive substance, with over 90% of reproductive-age women in the US reporting daily intake.
• Previous research on caffeine's impact on fecundability has yielded conflicting results, often relying on self-reported exposure which is prone to error.
• Factors influencing caffeine metabolism were not adequately addressed in prior studies.

Purpose of the Study:

• To investigate the association between preconception serum caffeine metabolites and fecundability.
• To examine the relationship between self-reported caffeinated beverage intake and fecundability.
• To assess the impact of both measured metabolites and reported intake on the ability to conceive.

Main Methods:

• 1228 women aged 18-40 with a history of pregnancy loss were prospectively studied.
• Serum samples were analyzed for caffeine, paraxanthine, and theobromine levels.
• Self-reported caffeinated beverage intake and fecundability were assessed using Cox proportional hazards models.

Main Results:

• Serum levels of caffeine, paraxanthine, and theobromine were not significantly associated with fecundability.
• Baseline intake of total caffeinated beverages, caffeinated coffee, or caffeinated soda showed no association with fecundability.
• Adjusted fecundability odds ratios (FORs) for higher metabolite levels or beverage intake did not indicate a negative impact.

Conclusions:

• Current findings suggest that caffeine exposure from low to moderate intake of caffeinated beverages is unlikely to influence fecundability.
• The results provide reassurance for women concerned about caffeine consumption and its potential effects on conception.
• Further research could explore individual variations in caffeine metabolism.