News | Study Finds More Than 7 Drinks per Week May Reduce IVF Success in Women, While Caffeine Has No Significant Effect
A systematic analysis published in Acta Obstetricia et Gynecologica Scandinavica found that women's caffeine intake had no significant effect on the success of in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI), while alcohol consumption may reduce pregnancy and live birth rates.
The analysis included all relevant studies published through July 15, 2022: 7 on caffeine and 9 on alcohol, involving 26,922 women receiving fertility treatment and their partners.
The study found:
Caffeine intake — Coffee, tea, or other caffeinated beverages consumed by women had no significant effect on IVF success rates.
Alcohol intake by women — More than 84 grams per week, about 7 standard drinks, was associated with a 7% lower pregnancy rate.
Alcohol intake by men — More than 84 grams per week by the male partner was associated with a 9% lower live birth rate for the female partner.
Lead author Yufeng Li, MD, of Tongji Hospital in China, said:
“Both partners should be aware that modifiable lifestyle factors, such as drinking habits, may affect the success of fertility treatment. Further research is needed to clarify exactly how alcohol affects the reproductive system.”
How Might Alcohol Affect Fertility Treatment Success?
Research suggests that alcohol metabolites may affect the reproductive system and reduce pregnancy and live birth rates. Possible mechanisms include:
1️⃣ In women: Alcohol may disrupt ovarian function, affect egg quality and maturation, and reduce endometrial receptivity, potentially affecting implantation and maintenance of pregnancy.
2️⃣ In men: Alcohol may reduce sperm quality and motility and may cause DNA damage, potentially affecting fertilization, embryo development, and ultimately live birth rates.
Alcohol may also increase oxidative stress and alter hormone secretion, further affecting fertility.
Does Caffeine Affect IVF Success?
Although previous studies suggested that caffeine might affect female hormone levels, this analysis found no significant association between women's caffeine intake and IVF pregnancy or live birth rates.
This suggests that moderate coffee or tea consumption may not significantly affect fertility treatment success, although more research is needed on the long-term effects of high caffeine intake.
Study Implications: Dietary Considerations for Couples Undergoing IVF
This study highlights that modifiable lifestyle factors, such as alcohol consumption, may affect IVF success.
✅ Reduce alcohol intake — Couples undergoing or planning IVF are advised to limit weekly alcohol intake, preferably avoiding alcohol altogether.
✅ Moderate coffee intake — The study found no significant effect of caffeine on fertility success, but intake of no more than 200-300mg per day, about 2-3 cups of coffee, is still advised.
✅ Support overall health — IVF success depends on many factors, including age, weight, stress, sleep quality, and diet, making a healthy lifestyle important.
Future Research
Although the study provides important scientific evidence, several limitations and questions remain:
Long-term effects of alcohol — The research focused mainly on short-term pregnancy and live birth rates. Whether long-term alcohol use affects offspring health remains unclear.
Effects on different populations — Sensitivity to alcohol may vary by physiology and genetic background, and future studies should examine individual differences.
Long-term effects of caffeine — Although no significant effect was found, future research should assess the potential effects of high caffeine intake on egg quality and embryo development.
Conclusion: Couples Undergoing IVF Should Carefully Limit Alcohol Intake
This study provides evidence for couples trying to conceive: alcohol intake by either partner may affect IVF success, while no significant effect from caffeine has been identified.
Women planning IVF: Reduce alcohol intake as much as possible, particularly because more than 84 grams per week may lower pregnancy rates.
Male partners: Excessive alcohol consumption may affect live birth rates and should also be reduced while trying to conceive.
Moderate caffeine intake: Current research found no effect on pregnancy or live birth rates, but moderation is still advised.
Longer and larger studies are needed to clarify the mechanisms linking alcohol and fertility and to support more evidence-based preparation for IVF.
News | Study Finds More Than 7 Drinks per Week May Reduce IVF Success in Women, While Caffeine Has No Significant Effect
News | Study Finds More Than 7 Drinks per Week May Reduce IVF Success in Women, While Caffeine Has No Significant Effect
A systematic analysis published in Acta Obstetricia et Gynecologica Scandinavica found that women's caffeine intake had no significant effect on the success of in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI), while alcohol consumption may reduce pregnancy and live birth rates.
The analysis included all relevant studies published through July 15, 2022: 7 on caffeine and 9 on alcohol, involving 26,922 women receiving fertility treatment and their partners.
The study found:
Caffeine intake — Coffee, tea, or other caffeinated beverages consumed by women had no significant effect on IVF success rates.
Alcohol intake by women — More than 84 grams per week, about 7 standard drinks, was associated with a 7% lower pregnancy rate.
Alcohol intake by men — More than 84 grams per week by the male partner was associated with a 9% lower live birth rate for the female partner.
Lead author Yufeng Li, MD, of Tongji Hospital in China, said:
“Both partners should be aware that modifiable lifestyle factors, such as drinking habits, may affect the success of fertility treatment. Further research is needed to clarify exactly how alcohol affects the reproductive system.”
How Might Alcohol Affect Fertility Treatment Success?
Research suggests that alcohol metabolites may affect the reproductive system and reduce pregnancy and live birth rates. Possible mechanisms include:
1️⃣ In women: Alcohol may disrupt ovarian function, affect egg quality and maturation, and reduce endometrial receptivity, potentially affecting implantation and maintenance of pregnancy.
2️⃣ In men: Alcohol may reduce sperm quality and motility and may cause DNA damage, potentially affecting fertilization, embryo development, and ultimately live birth rates.
Alcohol may also increase oxidative stress and alter hormone secretion, further affecting fertility.
Does Caffeine Affect IVF Success?
Although previous studies suggested that caffeine might affect female hormone levels, this analysis found no significant association between women's caffeine intake and IVF pregnancy or live birth rates.
This suggests that moderate coffee or tea consumption may not significantly affect fertility treatment success, although more research is needed on the long-term effects of high caffeine intake.
Study Implications: Dietary Considerations for Couples Undergoing IVF
This study highlights that modifiable lifestyle factors, such as alcohol consumption, may affect IVF success.
✅ Reduce alcohol intake — Couples undergoing or planning IVF are advised to limit weekly alcohol intake, preferably avoiding alcohol altogether.
✅ Moderate coffee intake — The study found no significant effect of caffeine on fertility success, but intake of no more than 200-300mg per day, about 2-3 cups of coffee, is still advised.
✅ Support overall health — IVF success depends on many factors, including age, weight, stress, sleep quality, and diet, making a healthy lifestyle important.
Future Research
Although the study provides important scientific evidence, several limitations and questions remain:
Long-term effects of alcohol — The research focused mainly on short-term pregnancy and live birth rates. Whether long-term alcohol use affects offspring health remains unclear.
Effects on different populations — Sensitivity to alcohol may vary by physiology and genetic background, and future studies should examine individual differences.
Long-term effects of caffeine — Although no significant effect was found, future research should assess the potential effects of high caffeine intake on egg quality and embryo development.
Conclusion: Couples Undergoing IVF Should Carefully Limit Alcohol Intake
This study provides evidence for couples trying to conceive: alcohol intake by either partner may affect IVF success, while no significant effect from caffeine has been identified.
Women planning IVF: Reduce alcohol intake as much as possible, particularly because more than 84 grams per week may lower pregnancy rates.
Male partners: Excessive alcohol consumption may affect live birth rates and should also be reduced while trying to conceive.
Moderate caffeine intake: Current research found no effect on pregnancy or live birth rates, but moderation is still advised.
Longer and larger studies are needed to clarify the mechanisms linking alcohol and fertility and to support more evidence-based preparation for IVF.
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