Probiotics and the Stomach: What’s the Connection?

The stomach, an essential organ of the digestive system located between the oesophagus and the duodenum, plays several roles in digestion. When food enters the stomach, it is mixed with gastric juices containing hydrochloric acid and digestive enzymes such as pepsin. This process begins the breakdown of proteins and transforms the food bolus into chyme, a semi-liquid substance.

The hydrochloric acid in the stomach maintains a very low pH, between 1.5 and 3.5, creating an acidic environment that supports pepsin activation and protein digestion. This high acidity also contributes to the body’s defence against pathogens that may enter the digestive system.

The stomach also regulates the flow of its contents into the small intestine via the pylorus, a sphincter that controls gastric emptying. This regulation allows chyme to be released gradually into the small intestine, supporting digestion and nutrient absorption.

Finally, the stomach lining is coated with mucus produced by its cells. This mucus forms a protective barrier that helps prevent hydrochloric acid from damaging the stomach lining. Without this protection, the stomach’s acidity could cause damage, including lesions or ulcers.

What is Gut Flora? Where is It Located?

The gut microbiota, formerly known as gut flora, is a collection of microorganisms (bacteria, yeast, viruses) living primarily in the colon, but also in other parts of the digestive tract, such as the small intestine and the stomach. This microbiota plays a central role in fibre digestion, the synthesis of certain vitamins, protection against pathogens, and the modulation of the immune system.

Probiotics have several essential functions, including rebalancing the gut flora. This rebalancing is particularly necessary after disruptions caused by factors such as antibiotic use, infections, or an unbalanced diet, which can upset the natural balance of bacteria in the digestive system.

In addition, probiotics play an active role in strengthening the immune system. They modulate the activity of immune cells, thereby increasing the body’s ability to defend itself against pathogens. This modulation helps prevent infections and can reduce the duration of illnesses.

They also aid digestion by helping to break down nutrients, which can prevent or alleviate gastrointestinal disorders such as diarrhea and constipation. Through these mechanisms, probiotics not only help maintain healthy digestion but also improve nutrient absorption, thereby promoting overall good health.

Probiotic supplements provide specific benefits for the stomach, particularly by improving digestion and protecting against certain gastric disorders.

• Reduced heartburn: Certain strains, such as Lactobacillus reuteri, can alleviate symptoms of gastro-oesophageal reflux disease (GERD) by regulating stomach acidity and strengthening the gastric barrier. These probiotics help soothe inflammation and prevent acid reflux​

• Ulcer Prevention: Probiotics can inhibit the growth of Helicobacter pylori, a bacterium involved in the formation of gastric ulcers. By limiting its activity, probiotics help reduce the risk of ulcer formation

• Improved Digestion: By rebalancing the microbial flora, probiotics promote better nutrient digestion, thereby reducing digestive discomforts such as bloating and gas

• Strengthening the Gastric Barrier: Probiotics strengthen the stomach lining, reducing the risk of infection and protecting against damage caused by acidity

Probiotics for Digestive Comfort - 30 capsules - Dietary Supplement

This natural dietary supplement is a synergy of five patented and clinically tested probiotic strains, including the SynbÆctive® SmilinGut blend, which has proven beneficial effects on the balance of the gut flora and intestinal comfort, combined with prebiotic fibres. Formulated with 16 billion CFU per capsule for optimal effectiveness, and presented in enteric-coated capsules for targeted release in the intestinal tract.

To promote optimal digestion, it is crucial to choose specific strains of probiotics, each with targeted effects on the digestive system.

Lactobacillus reuteri: This strain is well-documented for its effects in reducing heartburn and gastro-oesophageal reflux. It promotes the balance of gastric flora and reduces acidity, which helps prevent discomfort associated with acid reflux.

Lactobacillus rhamnosus: Extensively studied for its anti-inflammatory properties, L. rhamnosus helps alleviate digestive disorders such as diarrhoea and gastrointestinal infections. It also promotes a healthy immune response in the digestive tract, which helps prevent infections and improve overall digestive comfort.

Bifidobacterium bifidum: This strain is essential for maintaining a balanced gut microbiota, particularly in the colon. It helps reduce bloating and improves digestion by facilitating the fermentation of dietary fibre. B. bifidum is also involved in the production of certain B vitamins and the synthesis of short-chain fatty acids, which are essential for gut health.

These strains can be found in dietary supplements or fermented foods, and their regular consumption contributes to smoother digestion and better nutrient absorption, as part of a varied and balanced diet and a healthy lifestyle.

To maximize the effectiveness of probiotics, the timing of their intake plays a central role in influencing their survival and action within the digestive system. It is generally recommended to take probiotics on an empty stomach, ideally 15 to 30 minutes before breakfast. This practice helps reduce their exposure to stomach acid, which is at its lowest level upon waking. Indeed, a less acidic environment promotes the survival of beneficial microorganisms and facilitates their passage to the intestines, where they exert their effects.

Another strategy is to take probiotics about 30 minutes before a meal. This timing allows the probiotics to pass through the stomach before food stimulates increased production of stomach acid. This method is particularly beneficial for people with slow digestion or those suffering from gastro-oesophageal reflux, as it minimises the risk of acid reflux that could affect the survival of the probiotics.

Some experts also recommend taking probiotics at the end of the day, just before bedtime. The logic behind this recommendation is that digestive activity slows down at night, giving probiotics a better chance to establish themselves in the gut without being disrupted by the digestive process.

In conclusion, although the optimal time to take probiotics may vary depending on dietary habits and each individual’s specific circumstances, taking them on an empty stomach or just before a meal appears to be the most effective way to ensure their survival and optimize their function.

To promote a balanced microbiome in the stomach and digestive tract, several natural habits can be adopted. Here are some strategies based on scientific evidence:

1. High-Fibre Diet: Dietary fibre, particularly soluble fibre, plays an essential role as a prebiotic. It feeds beneficial gut bacteria, stimulating their growth and activity. Fruits, vegetables, legumes, and wholegrains are important sources of fibre. They are broken down by the gut microbiota, thereby promoting the production of short-chain fatty acids, which are beneficial for digestive health

2. Consumption of Fermented Foods: Fermented foods, such as yoghurt, kefir, miso, sauerkraut, and kombucha, are naturally rich in probiotics. These beneficial microorganisms, primarily lactobacilli and bifidobacteria, help restore and maintain microbial diversity in the gut and, to some extent, in the stomach. Regular consumption of these foods can support digestion and reduce microbial imbalances that may cause gastrointestinal disorders

3. Hydration: Water plays a crucial role in the digestive process. Adequate hydration helps maintain stool consistency and prevent constipation, while facilitating the transport of digested nutrients through the intestines. Additionally, a well-hydrated environment in the stomach and intestines promotes the activity of beneficial bacteria.

4. Stress Management: Chronic stress can have a negative impact on the microbiome, disrupting the balance of microorganisms and promoting the growth of pathogenic bacteria. Practices such as meditation, yoga, or deep breathing can help reduce stress, thereby protecting the gut and digestive flora. In addition, reducing stress alleviates symptoms of gastro-oesophageal reflux, which are often exacerbated by chronic tension.

Adopting these simple rituals can contribute to a healthy microbiome and promote better overall digestive health.

Although probiotics are generally safe, certain precautions should be taken:

Seek medical advice if you have a severe gastrointestinal condition, such as ulcers or gastro-oesophageal reflux disease (GERD).

Adjust the dose based on individual tolerance, as overconsumption can lead to bloating or gas.

Choose high-quality probiotics: Not all dietary supplements guarantee that the strains will survive until ingestion. It is important to check the manufacturer’s recommendations regarding storage and the viability of the probiotics.

If you experience stomach pain around mealtimes, know that this isn’t inevitable and that solutions exist. Certain healthy habits can already provide significant relief: staying well-hydrated, eating slowly, and learning to manage stress. Probiotics serve as a supplement to a varied and balanced diet and a healthy lifestyle.

Stéphanie is a pharmacist (since 2010) and holds a PhD in molecular biology (since 2012). Passionate about writing, she has produced medical content for nearly 15 years. Her goal is to make information accessible and easy to understand, without ever sacrificing scientific accuracy.