You have decided to start trying for a baby, and suddenly the kettle feels complicated. One article tells you caffeine is perfectly fine, the next suggests cutting it out entirely, and somewhere in the middle sits your morning cup of tea, which you would quite like to keep. For something as ordinary as a cuppa, it can generate a surprising amount of worry.
The reassuring news is that official guidance is a lot calmer than the internet makes it sound. Here is what is actually worth knowing about tea, caffeine and trying to conceive.
Why Caffeine Comes Up When You Are Trying for a Baby
Most of the formal advice on caffeine relates to pregnancy rather than conception. The NHS advises having no more than 200mg of caffeine a day during pregnancy, because higher intakes have been linked to a greater chance of miscarriage and stillbirth.
People trying to conceive often start thinking about that figure early, partly because pregnancy is rarely confirmed in the first few weeks. Getting a rough sense of your daily intake while you are trying simply means there is one less thing to overhaul later.
What the evidence does not say is that tea causes fertility problems. Research on caffeine and how long conception takes is mixed and far from settled, and no reputable body suggests your daily brew is the reason conception has not happened yet.
How Much Caffeine Is in Your Cup
Caffeine is easier to keep track of when you can see where it comes from. These are the NHS estimates for common sources.
| Drink or food | Estimated caffeine |
|---|---|
| Cup of tea (black or green) | 75mg |
| Cup of instant coffee | 100mg |
| 250ml can of energy drink | 80mg |
| Can of cola | 40mg |
| 50g plain dark chocolate | Less than 25mg |
| 50g plain milk chocolate | Less than 10mg |
Filter coffee and coffee shop drinks can contain considerably more than instant. Caffeine also turns up in guarana, some fitness supplements and certain painkillers, which is why total daily intake is more useful to think about than any single drink.
The Teas That Catch People Out
Plenty of people assume caffeine is a coffee issue, then realise their tea habit adds up too.
Green tea counts towards your total, and matcha tends to be more concentrated because you drink the whole leaf rather than an infusion of it. Chai is usually built on a black tea base, so it counts as well. Decaffeinated tea is not completely caffeine free either, although the amount left is small.
None of this means giving anything up. It mostly means knowing which cups are doing what, in the same way you would pay attention to strength and flavour when tea tasting. Four mugs of builder’s tea spread across the day sits around 300mg, so swapping one or two for something caffeine free is usually enough to bring the total down without changing your routine much.
Herbal Teas and Why Natural Does Not Always Mean Suitable
Herbal teas are the obvious substitute, and this is where the picture gets less straightforward. There is not much research into drinking them during pregnancy, so NHS guidance is to have no more than four cups a day and to avoid teas containing liquorice root altogether.
That is worth keeping in mind if you already drink a lot of them, or if you enjoy the kind of detoxifying teas that are marketed for daily use. The same goes for blending your own, where it pays to know exactly which botanicals are in the mix. Herbal does not automatically mean suitable for everyone, and anything you are unsure about is worth raising with your GP or midwife rather than researching at midnight.
Tea Habits Are One Small Part of a Much Bigger Picture
It is easy to focus on the things you can control, and tea is very controllable. Fertility, unfortunately, is not. Age, ovulation, sperm quality, endometriosis and plenty of other factors play a part, and adjusting your caffeine intake will not change any of them.
According to NHS infertility guidance, more than eight in ten couples where the woman is under 40 will conceive naturally within a year of regular unprotected sex. It suggests seeing a GP if you have not conceived after a year of trying, and sooner if you are 36 or over or already know you may have fertility problems.
If investigations lead to treatment, clinics such as Hull & East Riding Fertility set out options including intrauterine insemination, where sperm is placed directly into the womb around the time of ovulation. Whichever route you take, the HFEA is the place to check that a clinic is licensed, along with its inspection reports and patient ratings.
When the Kettle Stops Being Complicated
Trying to conceive involves enough second-guessing without turning every cup of tea into a decision. Knowing roughly where your caffeine comes from, keeping herbal teas varied and sensible, and talking to a professional when something feels off is genuinely all the tea side of this asks of you.
Then you can put the kettle on and think about the flavour instead of the arithmetic.
