From the age of 40, the gut microbiota plays a crucial role in our overall health, as the body undergoes several key changes during this decade that can directly impact it. How well we look after it now will largely dictate how good we feel—not just throughout our 40s, or during perimenopause and menopause, but for decades to come.
With input from leading experts, we’ve put together the ultimate guide to help you understand what the microbiota actually is, why its job is so vital, what threatens it and how you can protect it without a fuss.
What is the microbiota and what happens when it gets out of whack?
"We host trillions of bacteria and other microorganisms inside our gut that are absolutely vital to our health—they're heavily involved in digestion, metabolism, hormonal balance and controlling inflammation," explains Dr Mariel Silva, Medical Director at SHA Wellness Clinic.
"We talk about dysbiosis when there's a shortage of beneficial bacteria alongside an overgrowth of microbes that shouldn't be present in such large numbers," she says.
© Getty"When we refer to a leaky gut, we mean the intestine isn't working properly as a barrier; in other words, its ability to decide what gets absorbed into the body and what gets kept out is compromised."
Surprising warning signs your gut health is out of balance
When the gut microbiota gets out of balance, "The symptoms can manifest both inside and outside the digestive tract," explains Dr Silva.
Key warning signs include:
- Abdominal bloating and general discomfort
- Indigestion
- Changes in bowel habits
- Persistent fatigue and overall low energy
- A general sense of feeling unwell
"That's precisely why looking after your microbiota is so vital: it doesn't just govern digestion—it directly dictates health across your whole body," she warns.
Why your gut changes in your 40s: The hormone connection
As the years roll by, the body undergoes a series of natural physiological shifts. "In women, from the age of 40—and sometimes earlier—fluctuations in oestrogen and progesterone disrupt the menstrual cycle," explains Dr Ana María Román, Head of Gynaecology at Sanitas La Moraleja Hospital in Madrid. "These fluctuations can also impact sleep, body temperature regulation, mood and concentration.
© Getty Images"Many women go to their doctors complaining of insomnia, irritability, or constant tiredness, completely unaware that hormones are behind it. Spotting these signs early means we can step in sooner and get much better results."
When it comes to your gut, perimenopausal hormone fluctuations can cause an imbalance in your gut bacteria which can affect everything from your weight and mood to your mental health.
Beyond the physical side of things, this stage can take a real toll on emotional wellbeing. Hormonal shifts directly affect the brain chemicals responsible for regulating mood, making you far more vulnerable to stress or sudden bouts of anxiety.
Add in the typical pressures of midlife, from work to ageing parents, and these symptoms can feel all the more intense.
5 daily habits that secretly disrupt your midlife gut health
According to digestive surgeon Dr Álvaro Campillo, the primary culprits behind poor gut healthare:
- Eating too many high-calorie foods that offer very little actual nutrition.
- High alcohol intake combined with hidden or excess sugars.
- Eating more frequently than usual and constantly picking at food between meals.
- Irregular eating times and late nights disrupting your body clock.
- Not getting enough exercise.
© Getty ImagesExpert-backed steps to protect your gut health in your 40s
As Dr Silva puts it, "A balanced gut microbiota is a precious asset, and keeping it healthy is well within our control." She notes that "maintaining these bacteria and microorganisms in top condition comes down to our diet, how active we are, how well we sleep, and how we handle stress."
In this respect, the expert reminds us that "the gut-brain connection is well established. We've all been there: before an exam, a job interview or a high-stress moment, you get a knot in your stomach or your digestion goes completely haywire.".
This, she points out, shows that "the connection goes both ways". "It isn't just the brain sending signals to the gut; when your gut is off-kilter, it can trigger symptoms like fatigue or brain fog," she explains. That is why she stresses that looking after your microbiota isn't just about eating a balanced diet—it demands a whole-body approach.
© Getty ImagesIf you want to take care of your microbiota, experts recommend two areas areas to focus on:
1. Supporting metabolic health
Personal trainer and physiotherapist Crys Dyaz views muscle as "a vital indicator of overall health, which becomes even more critical for women going through menopause." She notes that muscle mass plays a key role in supporting the microbiota, boosting brain health, and fighting inflammation, "especially alongside shifts in metabolism and liver function."
2. Focusing on diet and nourishment
According to integrative nutritionist Elisa Blázquez, "you don't need a restrictive diet, but it is important to adopt an anti-inflammatory lifestyle that protects your gut. That means cutting out ultra-processed foods, sugars, and refined flours, while stocking up on fresh vegetables and high-quality whole foods."
From your 40s onwards, prioritizing fibre and fermented foods is essential for a balanced microbiota and smooth digestion.
Also pay attention not just to what you eat, but when you eat it. "Sticking to regular meal times and giving your system a rest between main meals—three a day is plenty—is key, while cutting out grazing between meals altogether," she advises. Opt for an early, light evening meal so your gut can cleanse and recover overnight.
Staying well-hydrated is equally essential, so aim for at least six to eight glasses of water a day. "On top of that, targeted nutritional supplements can be a brilliant ally for supporting your digestive health," she adds.
