Why am I still bloated despite eating a healthy diet?

Many people assume that eating a healthy diet automatically means they’ll have perfect digestion. But if you’re still struggling with bloating, reflux, constipation or loose stools despite making healthy food choices, then you’re not alone.

Digestive symptoms such as bloating are influenced by much more than the quality of your diet. Everything from gut bacteria, stress, hormones and the way you eat your food can play a role. In this article, we’ll look at the most common reasons bloating and gut issues persist, even when you’re eating well and what you can do about it.

Common causes of bloating

You’ve changed your diet too much too soon

Many people decide to ‘get healthy’ and make sudden, drastic diet changes all in one go. They move from a diet high in processed foods and low in fibre to suddenly eating lots of fruits, vegetables, beans and lentils because they’re healthy and for one reason or another realised they need to change their diet. But if you haven’t been including these foods regularly in your diet, then for some people it’s too much too soon.

High fibre foods are great food sources for healthy gut bacteria, which is one reason why we should be eating them. When you feed gut bacteria, they can produce gas, and for some people it’s too much, which causes bloating and stomach cramps. The best thing to do is add a small handful of vegetables to one meal and then gradually increase the amount and type of vegetables each week so the body and gut bacteria have time to adjust.

You’re not chewing your food properly

Eating slowly and chewing your food till it’s complete mush takes a lot of pressure off the rest of the digestive organs because it’s the only place where mechanical digestion takes place. Once swallowed, stomach acid, digestive enzymes, and bile break down the rest of the food.

The more intact the food still is, the more acid and enzymes you’re going to need to break the food down into small enough particles to be properly absorbed. This can also lead to food sitting in the stomach for longer, risking fermentation, which can lead to the production and build-up of gas.

You’re eating on the go and when you’re stressed

If you eat your lunch at your desk whilst still working or scrolling on your phone, or you grab a sandwich whilst running around on your lunch break, then you’re reducing your digestive function without even realising it. Digestion starts in the brain and is greatly influenced by stress, so to optimise your digestion you need to move away from your desk, stop running around and sit somewhere quiet and peaceful so the brain can switch off from work and focus on eating.

When we think about the food we’re about to eat, our brain sends messages down to our digestive organs in preparation for food, starting off the production of stomach acid and digestive enzymes. Think about the saying "it's making my mouth water". This is because thinking about food starts off the first process of digestive secretions, which is saliva. Eating when you feel relaxed further supports digestive function because it switches the nervous system to the rest and digest state.

You’re under chronic unresolved stress

Not only does short-term stress affect digestion, but the longer you are stressed, the greater the impact it will have on your digestion. Many people don’t realise that the digestive system is under the control of the nervous system, so stress immediately impacts digestion.

Finding ways to manage stress is going to be key in resolving your digestive symptoms. Yoga, Tai Chi, Qi gong (where your mind is switched to focusing on movements), walking in nature, deep breathing exercises such as alternate nostril breathing or box breathing, listening to calming music or even using some of the latest vagal stimulation devices – find what works for you and do it daily.

Food intolerances

Not everyone reacts the same way to foods; some have trouble breaking down the proteins or sugars.

Common culprits are: 

• lactose
• fructose
• wheat

Some foods contain fermentable carbohydrates (FODMAPs), which can be a problem.

These include foods such as:

• onions
• garlic
• apples
• pears
• cauliflower
• mushrooms
• chickpeas
• lentils

Elimination diets can help to identify if any of these foods are causing your gut symptoms. Ideally, this should be supervised by a professional.

Is there microbial overgrowth?

Small intestinal bacterial overgrowth (SIBO) or small intestinal fungal overgrowth (SIFO) might be causing your symptoms. These bacteria and fungi can be pathogenic or part of your healthy gut microbiome, but they are growing in the wrong place.

There shouldn’t be many microbes in the small intestine; they should mainly be in the large intestine, but for various reasons they end up where they shouldn’t be and start causing problems. The answer to this isn’t about killing everything with antimicrobials; it’s about supporting your digestive system so these microbes don’t set up home in the first place.

Hormonal fluctuations  

For many women, digestive symptoms fluctuate throughout their cycle due to changes in oestrogen and progesterone. Balancing your hormones can help to balance your digestion in those who find their symptoms are connected with menstruation. 

Too many raw foods

Raw foods sound healthy, but they are actually harder for people with sensitive guts to digest. Cooking foods helps to break the food down, so it’s pre-digested to a certain extent, making it easier for the body to assimilate. Also, cold foods and drinks can reduce what traditional Chinese medicine calls ‘digestive fire’. Cooked foods are thought to be more warming to the digestion and support the digestive fire.

Could it be an underlying medical condition?

Persistent or severe bloating can sometimes be linked to conditions such as IBS, IBD, coeliac disease, endometriosis and ovarian conditions, for example, so it’s important to first have your symptoms medically assessed by visiting your GP.

While herbal teas such as peppermint, chamomile, ginger and fennel may provide temporary relief from bloating, and supplements like magnesium can support sleep and relaxation if stress is contributing to symptoms, it’s important to remember that these approaches are only managing the symptoms – not addressing the underlying cause.

The key is to identify why it’s happening in the first place. Whether it’s related to your eating habits, gut health, stress or food intolerances, or even an underlying medical condition, understanding the root cause allows you to take the right steps to longer-lasting relief rather than relying on a temporary quick fix.

If you’re unsure what’s driving your symptoms, then seek advice from your GP or a registered nutrition professional to help you find a personalised long-term solution.