Brighton, 15 November 2026 — BJ Weekend Read — By Nick Staunton
From 13 December, almost every white loaf, pizza base and supermarket cake sold in Brighton & Hove will contain added folic acid. Under amended Bread and Flour Regulations that took effect in November 2024, millers have until that date to add folic acid to non-wholemeal wheat flour at 250 micrograms per 100 grams. It is the biggest change to the British diet by law in a generation, and most people haven’t heard about it.
Britain joins the US, Canada, Australia and dozens of other countries that already fortify flour, around 80 according to the British Dietetic Association. Supporters say it will protect unborn babies. Critics call it mass medication by the back door. Here is what’s actually true, and where the real questions lie.
What Is Actually Changing
Start with what isn’t changing, because much of the online debate gets this wrong. Wholemeal flour is exempt. So are rye, oat, spelt and gluten-free flours, flour from small mills producing under 500 tonnes a year, and most products made abroad, according to the Real Bread Campaign. Anyone who wants to avoid added folic acid can still buy wholemeal bread.
Fortification isn’t new in principle either. Since the Second World War, British white flour has had to contain added calcium, iron, thiamin and niacin. Folic acid is simply the latest addition to a list most of us never knew existed.
Why the Government Did It
The case rests on neural tube defects: conditions such as spina bifida, where a baby’s brain or spinal cord fails to form properly. The neural tube closes within about four weeks of conception, often before a woman knows she is pregnant. Getting enough folate at that stage sharply cuts the risk.
The NHS already advises women to take a 400-microgram supplement before conception and for the first 12 weeks of pregnancy. But around half of UK pregnancies are unplanned, and only about a third of women take supplements beforehand. Uptake falls to just 6% among women under 20, according to the BDA. Three-quarters of women of childbearing age have blood folate below the World Health Organization’s threshold for preventing these defects.
Modelling suggests fortification could prevent 200 to 300 affected pregnancies a year across the UK. That is why the medical establishment, including the charity Shine, backs the policy. Some scientists argue the chosen level is too low.
So Why Should Everyone Eat It?
This is the obvious question: why add something to everyone’s bread to reach a small group of women?
The honest answer is that fortification only reaches women who aren’t planning a pregnancy if it reaches everyone. Men, children and pensioners eating fortified bread are a side effect of the policy, not its purpose. The government is betting that the dose is low enough to be harmless for them and high enough to help the women who need it. Whether that trade-off is acceptable is a question of values as much as science.
The Claims Doing the Rounds
“It isn’t a vitamin, it’s a drug.” Partly true. Folic acid is the synthetic form of vitamin B9, while folate occurs naturally in leafy greens, beans and liver. At higher doses folic acid is sold as a medicine, which is why the NHS has a medicines page for it. The amount in fortified flour is a fraction of a standard tablet.
“The NHS says people with cancer shouldn’t take it.” True, but it refers to tablets. The NHS lists people with cancer, B12-deficiency anaemia or a coronary stent among those for whom folic acid tablets may not be suitable. Anyone with cancer should ask their specialist about their total intake.
“It’s mass medication.” This is the strongest objection. Britain had the same argument over water fluoridation. Campaigners such as the Real Bread Campaign oppose fortification on grounds of choice, calling it a sticking plaster over poor diets. Defenders reply that iodised salt and fortified flour have quietly saved lives for decades, and that wholemeal remains an opt-out.
How Much Folic Acid Is Too Much – and Could There Be a Cancer Risk?
The idea that more folic acid is always better isn’t supported by the science. Adults have an established upper limit of 1,000 micrograms (1mg) a day of synthetic folic acid from supplements and fortified foods. The concern isn’t that ordinary amounts are dangerous. It’s that excessive, prolonged exposure may have consequences we don’t yet fully understand.
Two issues stand out. First, high doses of folic acid can mask a vitamin B12 deficiency, correcting the anaemia it causes while neurological damage continues unnoticed. That matters most for older people, who are more likely to have an undiagnosed B12 deficiency.
Second, researchers have examined whether high folate levels could encourage the growth of existing precancerous cells. Folate is essential for DNA production and cell division, so its relationship with cancer is complicated. Adequate folate may help protect against cancer developing in the first place, but there is a scientific hypothesis that high doses could speed up cells that are already abnormal. The evidence is mixed, and it is not proof that folic acid causes cancer.
The Unmetabolised Folic Acid Question
A third issue is attracting attention in the United States. The body has to convert folic acid into active forms of folate. When intake exceeds what the body can process, some unmetabolised folic acid stays in the bloodstream.
A US study using national data from 2001–2002 found detectable unmetabolised folic acid in around 38% of adults aged 60 and over, even after fasting. Supplement use was more common among them. The researchers concluded that further monitoring was warranted, partly because of unresolved questions about cancer risk.
That finding deserves attention, but it needs context. Finding unmetabolised folic acid in the blood doesn’t show it is causing harm. A major analysis of 13 randomised trials involving almost 50,000 people found no statistically significant rise in cancer among those taking folic acid supplements over an average of 5.2 years.
So the evidence doesn’t show that unmetabolised folic acid causes cancer. Nor does it answer every question about decades of exposure through fortified food, supplements and other sources.
The Risk of Adding Everything Together
Could fortified bread alone push people towards excessive intake? Probably not for most people. At 250 micrograms per 100g of flour, a typical slice of bread might add roughly 50–60 micrograms. That is an estimate, because the real figure depends on the recipe.
The bigger question is cumulative exposure. Someone eating fortified bread and breakfast cereal, while also taking a multivitamin and a separate folic acid supplement, could take in far more than someone relying on bread alone. That’s why clear labelling, sensible fortification levels and ongoing monitoring matter.
Brighton Local
For Brighton & Hove’s independent bakers, the details matter. Wholemeal, spelt and rye are exempt, as is flour from small mills, so many artisan sourdough loaves won’t change at all. Bakers buying standard white flour from big mills will be using fortified flour from December, and customers will start asking which is which. It’s another compliance question for a sector already under pressure, much like the carbon reporting rules facing Brighton’s small businesses. If you’re planning a pregnancy, the advice from local GPs and midwives is unchanged: keep taking the supplement.
Where This Leaves Us
The evidence that folic acid prevents birth defects is strong. The real question is whether the right way to deliver it is through everyone’s bread.
The people who need extra folic acid are women who could become pregnant. Everyone else (men, children, pensioners, people with cancer or undiagnosed B12 deficiency) is being given an extra dose they don’t need, with long-term effects, including unmetabolised folic acid, that are not yet fully understood. A targeted approach would protect the women the policy is meant for without changing what an entire population eats.
That could mean free folic acid supplements for every woman of childbearing age, available from pharmacies without a prescription. It could mean making folic acid part of every GP contraception review and sexual health appointment, and running a proper national awareness campaign aimed at young women, where uptake is lowest. Clearly labelled fortified products could also be offered as a choice rather than a default.
The government’s answer is that targeting has already been tried and has failed. The NHS has recommended supplements for decades, yet only around a third of women take them before pregnancy, and many pregnancies are unplanned. That is a fair point. But it is an argument for doing targeting better, not for abandoning it in favour of medicating the whole population.
Ministers said last year that they were “exploring options to evaluate the policy.” That evaluation should be independent and published, with long-term monitoring built in, and it should ask whether a targeted alternative could achieve the same result. Then everyone in Brighton can make up their own mind about what’s in their bread.
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