Can Caffeine and Alcohol Affect Fertility?
If you’re trying to conceive, it’s natural to start questioning everyday habits - especially your morning coffee or that glass of wine at the weekend. But how much do caffeine and alcohol really affect your chances of getting pregnant?
Rather than following extreme advice like "cut everything out" or "ignore it completely," the truth lies somewhere in the middle. Let’s look at what the science actually says so you can make informed, stress-free decisions.
Understanding Fertility and Lifestyle
Fertility isn’t controlled by just one factor—it’s the result of a complex system involving:
- Hormonal balance
- Egg and sperm quality
- Ovulation and implantation
- Overall health and inflammation
Lifestyle choices like caffeine and alcohol don’t usually cause infertility on their own - but they can influence this delicate system.
Caffeine and Fertility: What We Know
Moderate caffeine is generally considered safe
Research shows that moderate caffeine intake doesn’t appear to significantly reduce fertility for most people. Some large studies - even in fertility treatment settings - found no clear link between caffeine and reduced pregnancy rates. However, evidence isn’t entirely consistent.
High caffeine intake may have an impact
At higher levels, caffeine may:
- Increase the time it takes to conceive
- Interfere with hormone regulation and ovulation in some cases
- Can affect sperm DNA quality and motility
- Slightly increased risk of pregnancy loss
Because of these potential effects, health organisations advise caution.
How much caffeine is safe when trying to conceive?
In the UK, guidance suggests keeping caffeine intake below 200 mg per day—roughly:
- 1–2 cups of coffee
- 2–3 cups of tea
There isn’t strong evidence that caffeine directly harms fertility, but limiting intake is recommended as a precaution.
Alcohol and Fertility: A Clearer Picture
Unlike caffeine, alcohol shows a stronger and more consistent link with reduced fertility.
Alcohol can affect female fertility
Research suggests alcohol may:
- Disrupt hormones needed for ovulation
- Lead to irregular menstrual cycles
- Reduce the likelihood of implantation
Even moderate drinking (a few drinks per week), especially during key points in your cycle, has been associated with lower chances of conception.
Alcohol also impacts male fertility
Fertility isn’t just about one partner—male factors matter too. Alcohol can:
- Reduce testosterone levels
- Raises estrogen levels
- Impairs liver's ability to use Vitamin A (needed for development of sperm)
- Lower sperm count and reduced motility
- Affect sperm structure and DNA quality
Some studies also show a link between alcohol use and decreased live birth rates in fertility treatments when male partners drink regularly.
The dose matters
Research consistently shows a dose-dependent effect:
- Light/occasional drinking - smaller impact
- Moderate to heavy drinking - reduced fertility and lower success rates
For example: Women consuming more than about 7 drinks per week had lower pregnancy rates in fertility studies.
So, alcohol poses a more consistent risk to fertility than caffeine.
Practical Tips When Trying to Conceive
For caffeine:
- Keep intake below ~200 mg per day.
- Watch hidden sources (energy drinks, chocolate, medications).
- Swap in herbal teas or decaf options.
For alcohol:
- Reduce or better still avoid completely for 3-4 months before trying to conceieve, to ensure you get the best quality sperm..
- Limit intake during ovulation and the second half of your cycle.
- Encourage both partners to be mindful.
The Bottom Line
- Caffeine (in moderation) is unlikely to significantly harm fertility - but limiting it is a sensible precaution.
- Alcohol, especially in moderate or high amounts, is more clearly linked to reduced fertility in both men and women.
- Small lifestyle changes, combined with good nutrition and overall health, can help create the best possible environment for conception.
A Gentle Reminder
Trying to conceive can feel overwhelming, especially with conflicting advice everywhere. Remember: One coffee or an occasional drink does not define your fertility journey.
NB: One thing to note is the increased risks of alcohol and caffeine to the unborn baby. Please see our other blog post [insert link here] for this information.