It feels like everyone’s suddenly turned lactose intolerant these days—maybe even you.
If you’ve noticed that your morning flat white or a bowl of cereal is consistently followed by a bloated belly, uncomfortable cramps, or a sudden dash to the loo, you’re definitely not alone. You might write off digestive issues as general stress or just eating too quickly, but millions of adults do actually struggle to break down the natural sugars found in dairy products without even realising it. Working out whether your body is actually reacting to milk isn’t as complicated as it sounds, and figuring it out doesn’t mean you have to give up all your favourite foods overnight.
Dairy products tend to catch up with people as they age.
Turns out, there’s a fairly simple explanation behind the prevalence of lactose intolerance in adults: getting older. It’s a common condition that becomes more likely as people age, with some estimates suggesting it affects close to 70% of the world’s population at some point.
As we get older, our bodies gradually produce less lactase, the enzyme responsible for breaking down lactose, the type of sugar found in milk, yoghurt, cheese, butter, and cream. When there’s more lactose in your system than your body can actually process, that’s when the uncomfortable symptoms start showing up.
Your background plays a bigger role than you’d think.
Race and ethnicity have a big influence on your likelihood of developing it, too. Lactose intolerance can affect 90% or more of people of East Asian descent, compared to somewhere between 15 to 25% of people with European heritage. That gap comes down to genetics, since a large number of people of Caucasian descent carry a gene that allows them to keep producing lactase well into adulthood.
Symptoms typically include stomach pain or cramping, bloating, gas, a rumbling stomach, diarrhoea or constipation, and nausea or being sick. These can show up anywhere from a few minutes to several hours after eating something containing lactose, with severity depending on how much you’ve consumed and your own personal tolerance.
The symptoms are easy to miss at first.
Part of why so many people don’t immediately connect their symptoms to dairy is that early signs can be fairly subtle. Someone might experience occasional bloating and put it down to stress, IBS, their menstrual cycle, or simply eating a bit too much, before eventually noticing a clear pattern linked specifically to dairy.
Ageing clearly explains a lot of what’s driving this rise, but there’s also been a noticeable increase in people actually being diagnosed. That doesn’t necessarily mean more people have the condition than before, it’s more likely down to greater public awareness and people being more willing to seek help for digestive symptoms rather than just living with them.
More people are being formally diagnosed now.
The growing range of lactose-free products on supermarket shelves has likely played a role too, helping raise general awareness of the condition. More people are recognising their digestive symptoms for what they actually are and seeking medical advice, rather than assuming they simply have a sensitive stomach or cutting dairy out on their own without ever getting checked.
That change can make lactose intolerance appear far more common than it used to be, even though the underlying biological process hasn’t actually changed at all. There’s also a separate condition called secondary lactose intolerance, which happens when the lining of the small intestine becomes damaged or inflamed. Gastrointestinal infections, coeliac disease and inflammatory bowel disease can all temporarily reduce lactase production, though tolerance can sometimes improve again once the underlying condition has been treated.
What can you actually do if you suspect you’re affected?
If you think dairy might be causing your symptoms, keeping a simple food diary is a useful first step, noting down what you eat alongside any symptoms that follow. Booking an appointment with your GP matters too, since several other conditions can cause very similar symptoms, meaning it shouldn’t be something you diagnose yourself.
Conditions like IBS, coeliac disease and various other gastrointestinal issues can all present in strikingly similar ways. Usually, confirming a diagnosis involves cutting out lactose-containing products for a period to see whether symptoms actually improve as a result.
Doctors confirm the diagnosis in several ways.
A GP might also suggest blood tests or a hydrogen breath test to measure exactly how well your body digests lactose. If symptoms still don’t improve after removing lactose, a gastroscopy might be needed to take and examine cells from the small intestine directly.
If symptoms are severe, persistent, or come alongside unexplained weight loss, blood in your stool, or noticeable changes in bowel habits, seeking medical advice becomes particularly important rather than simply experimenting with your diet on your own.
Managing it doesn’t mean giving up dairy entirely.
The reassuring part is that being lactose intolerant doesn’t necessarily mean cutting dairy out of your life altogether, since there are now plenty of lactose-free alternatives available. It’s more about learning which dairy products contain higher amounts of lactose and which ones contain considerably less.
Milk, cream, ice cream and certain soft cheeses like ricotta or mozzarella tend to be higher in lactose. Hard, aged cheeses such as cheddar, parmesan, or Swiss generally contain much less and tend to be far better tolerated. Some yoghurts are also easier to digest thanks to the live cultures involved in how they’re made.
Finding your own personal threshold is important.
Lactose intolerance isn’t necessarily an all-or-nothing condition. Many people can comfortably handle a certain amount of lactose, which means figuring out your own personal threshold tends to be far more useful than simply writing off every dairy product entirely.
Over-the-counter lactase enzyme tablets can also help when you do want to enjoy a meal that includes dairy, working by helping your body break the lactose down more effectively. Anyone significantly cutting back on or removing dairy from their diet should also think about how they’re getting enough calcium, vitamin D and other nutrients dairy typically provides, whether that’s through fortified plant-based milks, other calcium-rich foods, or personalised advice from a dietitian if needed.
Managing symptoms long-term doesn’t have to be complicated.
Ultimately, lactose intolerance tends to be very manageable once you understand what’s actually going on with your own body. The goal isn’t necessarily avoiding dairy forever, but rather understanding your personal tolerance, identifying which specific foods trigger your symptoms, and making sensible adjustments without restricting your diet more than you actually need to.
