Introduction
Walking down the dairy aisle of any UK supermarket can feel surprisingly overwhelming. Shelves are packed with dozens of tubs, pots, and drinks, each claiming to support digestion, bolster immunity, or soothe an unhappy stomach. If you have ever stood in front of the chiller cabinet wondering which pot actually delivers genuine digestive benefits—and which is simply a pot of dessert wearing a healthy halo—you are far from alone.
Many people turn to fermented dairy when dealing with frustrating, everyday digestive discomforts, such as occasional bloating, sluggish transit, or a general sense that their digestion is out of rhythm. Yogurt has enjoyed a reputation as a digestive tonic for centuries, but modern manufacturing has changed how many commercial products are produced. Some varieties remain packed with diverse, beneficial microorganisms, while others undergo processing methods that leave behind very little live bacteria.
In this article, we will examine the science behind fermented dairy, comparing popular varieties such as traditional plain yogurt, Greek yogurt, Icelandic skyr, kefir, and plant-based alternatives. We will look closely at how to decode nutritional labels, what specific bacterial cultures to look for, and how combining yogurt with the right prebiotic foods can optimise your digestive environment.
At Blue Horizon, we believe that understanding your wellbeing starts with a sensible, evidence-led approach. We advocate the Blue Horizon Method: always consulting your NHS GP first to evaluate persistent or concerning symptoms, using structured symptom diaries to understand your day-to-day patterns, and considering targeted blood testing only when you need a clear, objective snapshot of your broader health markers.
Safety Note: If you ever experience sudden or severe symptoms—such as swelling of the lips, face, or throat, wheezing, difficulty breathing, or collapse—seek immediate emergency medical assistance by dialling 999 or attending your nearest A&E.
The Science of Yogurt and the Digestive System
To understand which yogurt is best for your digestive system, it helps to examine what happens during the fermentation process and how these cultured foods interact with your internal ecosystem. For more background, explore this guide to supporting the gut microbiome.
Your digestive tract is home to an intricate community of trillions of microorganisms, collectively referred to as the gut microbiome. The majority of these microbes reside in the large intestine (colon), where they assist in breaking down complex food components, producing essential vitamins (such as vitamin K and certain B vitamins), supporting the intestinal barrier, and interacting closely with your immune system.
Milk Base (Lactose + Protein)
│
▼ + Starter Cultures (S. thermophilus & L. bulgaricus)
Fermentation Process
│ (Lactose converted to Lactic Acid)
▼
Tangy, Cultured Yogurt + Live Microbes
How Fermentation Works
All traditional dairy yogurt begins with milk that has been pasteurised to eliminate harmful pathogens. Once cooled, specific live bacterial cultures are introduced. In the UK and across Europe, standard regulatory definitions require traditional yogurt to be fermented with at least two specific starter cultures:
- Streptococcus thermophilus
- Lactobacillus delbrueckii subsp. bulgaricus (often shortened to Lactobacillus bulgaricus)
During the fermentation stage, these microscopic organisms consume lactose—the naturally occurring sugar found in milk—and convert it into lactic acid. This process changes the milk in two distinct ways:
- Texture and Flavour: The increase in acidity causes milk proteins (casein) to coagulate and thicken, creating the characteristic creamy texture and pleasant, tangy flavour of yogurt.
- Lactose Breakdown: Because the starter bacteria feed on lactose, the overall level of milk sugar in the final yogurt is naturally lower than in an equivalent glass of fresh milk, making it gentler on sensitive digestive systems.
Starter Cultures vs Probiotic Strains
While starter cultures are essential for creating yogurt, they do not necessarily function as long-term therapeutic probiotics.
A probiotic is defined by the World Health Organization (WHO) and international scientific bodies as a live microorganism that, when administered in adequate amounts, confers a measurable health benefit on the host.
While S. thermophilus and L. bulgaricus assist digestion primarily by breaking down lactose during fermentation, many commercial yogurts and kefirs are enriched with additional, extensively researched probiotic strains. Common additions include members of the Bifidobacterium genus (such as Bifidobacterium animalis or Bifidobacterium lactis) and other Lactobacillus species (such as Lactobacillus acidophilus, Lacticaseibacillus casei, and Lacticaseibacillus rhamnosus).
Do Yogurt Bacteria Stay in Your System?
A common misconception is that eating a pot of cultured yogurt will permanently populate your digestive tract with new bacteria. In reality, the live microbes present in fermented foods are largely transient.
When you consume live yogurt, the bacteria journey through the acidic environment of the stomach and into the small and large intestines. As they travel through the digestive system, they interact with the gut lining, communicate with local immune cells, and produce beneficial short-chain fatty acids (SCFAs). Eventually, they pass out of the body.
Because these beneficial organisms do not set up permanent residence, enjoying a modest serving of cultured yogurt or kefir daily provides far greater digestive support than eating a large bowl once a week. Consistency keeps a steady stream of helpful microbes moving through your digestive tract.
Comparing Different Types of Yogurt for Digestive Health
The dairy aisle offers a diverse selection of cultured products. Each variety undergoes distinct manufacturing steps that influence its protein concentration, texture, lactose content, and microbial variety. You can also browse Blue Horizon’s wider gut health and microbiome resources for related digestive topics.
| Yogurt Variety | Typical Texture | Protein Profile | Lactose Level | Microbial Diversity |
|---|---|---|---|---|
| Traditional Plain | Smooth, pourable to spoonable | Moderate (4–6g per 100g) | Moderate | Standard starter cultures |
| Greek Yogurt | Thick, dense, creamy | High (8–10g per 100g) | Low (strained) | Starters + often added probiotics |
| Icelandic Skyr | Very thick, cheese-like | Very High (10–12g per 100g) | Low (strained) | Heirloom cultures + starters |
| Kefir | Drinkable, slightly fizzy | Moderate to High (3–5g per 100ml) | Very Low | Broadest (bacteria + beneficial yeasts) |
| Plant-Based | Varies (coconut, almond, soya) | Varies (soya highest) | Zero (lactose-free) | Dependent on manufacturer culturing |
1. Traditional Plain Natural Yogurt
Traditional, unstrained plain yogurt is made by fermenting whole, semi-skimmed, or skimmed milk. Because it is unstrained, it retains its liquid whey.
- Digestive Profile: Contains the original whey proteins and minerals, including calcium and potassium.
- Best For: Individuals looking for a classic, lightly tangy yogurt that provides a gentle source of natural calcium and starter cultures without heavy processing.
2. Authentic Greek Yogurt
Authentic Greek yogurt is made by taking traditional yogurt and straining it multiple times through fine mesh or centrifugal separators to remove the liquid whey.
- Digestive Profile: The straining process concentrates the milk solids, resulting in roughly double the protein content of standard yogurt. Straining also removes a substantial proportion of the liquid whey, which carries much of the residual lactose.
- Probiotic Retention: A common myth suggests that straining strips away beneficial bacteria. However, live cultures remain concentrated within the rich, curd-like solid matrix.
- Best For: Those who want a satiating, high-protein snack that stabilises energy levels and is naturally lower in lactose.
Caution on "Greek-Style": Always check the label. Authentic Greek yogurt is naturally thick due to straining. Products labelled "Greek-Style" are often unstrained standard yogurts thickened using added starches, gelatin, pectin, or cream, which changes their nutritional profile.
3. Icelandic Skyr
Skyr is an ancient Icelandic cultured dairy product. While consumed like yogurt, it is technically classified as a fresh, fermented skimmed-milk cheese.
- Digestive Profile: Skyr requires nearly four times the volume of milk used in standard yogurt production. It is naturally virtually fat-free and exceptionally high in protein.
- Microbial Profile: Skyr uses traditional Icelandic bacterial cultures alongside standard starter strains. It provides a dense matrix that helps protect bacteria as they navigate stomach acid.
- Best For: Anyone seeking maximum protein with minimal dietary fat, alongside live active cultures.
Microbial Diversity Comparison:
Standard Yogurt: [ 2 to 4 Bacterial Strains ]
Greek Yogurt: [ 2 to 5 Bacterial Strains ]
Kefir: [ 10 to 30+ Strains of Bacteria & Beneficial Yeasts ]
4. Kefir
While kefir is technically a fermented milk drink rather than a spoonable yogurt, it is often regarded as the gold standard for microbial diversity.
- How It Is Made: Kefir is produced by fermenting milk with "kefir grains"—symbiotic colonies of bacteria and beneficial yeasts embedded in a matrix of proteins and complex sugars (kefiran).
- Digestive Profile: While standard yogurts typically contain two to six distinct strains of bacteria, authentic kefir can contain between 10 and 30 or more distinct strains of beneficial bacteria and yeasts (such as Kluyveromyces marxianus and Saccharomyces cerevisiae).
- Digestive Action: The diverse microorganisms in kefir break down nearly all available lactose, making it one of the most digestible cultured dairy options available.
- Best For: Individuals whose primary goal is maximising the diversity of live microbes introduced to their digestive tract.
5. Plant-Based and Dairy-Free Yogurts
For individuals following a vegan lifestyle or those who choose to avoid dairy entirely, supermarket shelves now offer cultured products made from soya, coconut, almond, cashew, or oat milk bases.
- Live Cultures: Plant milks do not naturally ferment in the same manner as dairy. Manufacturers must introduce starter cultures to the plant milk base. Many high-quality brands add live Lactobacillus and Bifidobacterium strains after pasteurisation.
- Nutritional Considerations: Soya yogurt has a protein profile closest to traditional dairy. Coconut yogurt is naturally rich in fats but typically very low in protein. Oat and almond yogurts offer moderate textures but may require added stabilisers.
- What to Check: Always verify that the packaging explicitly states "contains live cultures". Ensure the product is fortified with calcium and vitamin B12 if it serves as your primary dairy replacement.
How to Read a Yogurt Label: What to Seek and What to Avoid
Food marketing can make identifying a genuinely health-supportive yogurt challenging. A pot decorated with fresh fruit graphics may contain more refined sugar than a chocolate pudding. Here is how to evaluate the packaging with a clinical eye. For more practical dietary guidance, read this guide to improving gut health through diet.
┌───────────────────────────────────────────────┐
│ THE YOGURT CHECKLIST │
├───────────────────────────────────────────────┤
│ [✓] Explicit "Live Cultures" Statement │
│ [✓] Named Probiotic Strains (e.g. BB-12) │
│ [✓] Short Ingredient List (Milk + Cultures) │
│ [✓] Low Added Sugars (<5g per 100g) │
│ [✗] "Heat-Treated After Fermentation" │
│ [✗] Artificial Sweeteners / Polyols (IBS) │
└───────────────────────────────────────────────┘
1. Confirm the Presence of "Live and Active Cultures"
To support your microbiome, the bacteria inside the pot must be alive when you eat them.
- Look For: Clear statements such as "contains live cultures", "live active bacteria", or a list of specific bacterial strains in the ingredients panel.
- Avoid: Yogurts that state "heat-treated after culturing" or "pasteurised after fermentation". Heat treatment extends shelf life and allows products to sit unrefrigerated, but it kills the live microorganisms, removing their probiotic value.
2. Look for Named Bacterial Strains
High-quality functional yogurts often list the specific genera, species, and strain designations included in their recipe.
In microbiological science, health benefits are strain-specific. For example:
- Lactobacillus is the genus.
- rhamnosus is the species.
- GG or HN001 is the specific strain.
Two different strains within the same species can have distinct properties. Brands that invest in well-researched strains—such as Bifidobacterium animalis subsp. lactis (BB-12) or Lactobacillus acidophilus (LA-5)—tend to state them clearly on the ingredients panel.
3. Check the Sugar Content
Added refined sugars can work against your gut health goals. A diet high in refined sugars can encourage the overgrowth of less favourable bacterial species and reduce overall microbial diversity in the colon.
All dairy yogurts contain some sugar naturally in the form of lactose (usually around 3g to 5g of total sugar per 100g in plain varieties). When reviewing the nutrition table:
- Green Flag: Plain, unflavoured yogurts where the ingredients list only milk and live cultures.
- Red Flag: Flavoured yogurts containing fruit purees, concentrates, syrups, or table sugar that push total sugar content above 10g to 15g per 100g serving.
Practical Tip: If you find plain, unflavoured yogurt too tart, buy plain natural or Greek yogurt and add your own fresh berries, a dash of ground cinnamon, or a single teaspoon of raw honey at home. This keeps you in total control of the sugar content.
4. Watch for Polyols and Emulsifiers
If you have a sensitive digestive system or experience frequent bloating:
- Sugar Alcohols (Polyols): "Diet" or "Zero Sugar" yogurts often replace natural sugars with artificial sweeteners or polyols such as sorbitol, xylitol, or erythritol. These compounds are poorly absorbed in the small intestine and are rapidly fermented by colonic bacteria, which can cause significant gas, cramping, and loose stools.
- Thickeners and Gums: Some low-fat or dessert-style yogurts rely heavily on modified corn starch, carrageenan, guar gum, and polysorbate emulsifiers to mimic the richness of whole milk. In some individuals, frequent intake of synthetic emulsifiers can irritate the delicate mucosal lining of the bowel.
Maximising the Benefits: What to Eat With Your Yogurt
While the live bacteria in yogurt are valuable, they do not work in isolation. To foster a healthy digestive environment, you need both probiotics (the beneficial microbes) and prebiotics (the non-digestible fibres that feed your resident beneficial bacteria).
Combining cultured yogurt with prebiotic-rich whole foods creates what nutritional scientists call a synbiotic meal.
┌────────────────────────┐ ┌────────────────────────┐
│ PROBIOTICS │ │ PREBIOTICS │
│ (Live Cultures in │ + │ (Fibre & Nutrients in │
│ Yogurt or Kefir) │ │ Berries, Seeds, Oats)│
└───────────┬────────────┘ └───────────┬────────────┘
│ │
└───────────────┬────────────────┘
▼
┌──────────────────────────────┐
│ SYNBIOTIC EFFECT │
│ Optimal Microbiome Support & │
│ Short-Chain Fatty Acid (SCFA)│
│ Production │
└──────────────────────────────┘
Here are some of the most effective whole-food additions to pair with your yogurt:
High-Fibre Berries
- Raspberries and Blackberries: These fruits are among the richest sources of dietary fibre, delivering approximately 7g to 8g of fibre per 100g. They also contain polyphenols—natural plant compounds that act as antioxidants and encourage the growth of beneficial Bifidobacteria.
- Blueberries: Packed with anthocyanins, blueberries support vascular health and provide gentle prebiotic nourishment for colonic microbes.
Seeds Packed with Soluble Fibre
- Chia Seeds: Two tablespoons of chia seeds provide roughly 10g of fibre. When stirred into yogurt, they absorb moisture and form a soothing gel that promotes smooth bowel transit.
- Ground Flaxseeds (Linseeds): Rich in soluble fibre and plant-based omega-3 fatty acids (alpha-linolenic acid). Always use ground flaxseeds rather than whole seeds, as whole seeds can pass through the digestive system undigested.
Whole Grains and Resistant Starch
- Jumbo Rolled Oats: Stirring raw oats into yogurt creates an overnight-oat texture. Oats are rich in beta-glucan, a soluble prebiotic fibre shown to support healthy cholesterol levels and nourish the intestinal lining.
- Slightly Green Bananas: Bananas that still have a hint of green on their skin are rich in resistant starch. This type of starch resists digestion in the small intestine, arriving intact in the colon where beneficial bacteria ferment it into butyrate—a short-chain fatty acid that serves as the primary energy source for your colonic cells.
When Yogurt Causes Discomfort: Navigating Digestive Sensitivity
While yogurt is widely celebrated for digestive support, some people find that eating dairy triggers discomfort, bloating, or altered bowel habits. Understanding why this happens can help you determine the right dietary choices for your body.
Experiencing Discomfort from Yogurt?
│
┌───────────┴───────────┐
▼ ▼
Lactose Sensitivity High-FODMAP Additives
│ │
├─ Try Greek / Skyr ├─ Check for Inulin / Chicory Root
├─ Try Kefir ├─ Avoid Polyols / Artificial Sweeteners
└─ Try Lactose-Free └─ Choose Plain, Unflavoured Options
1. Lactose Digestibility in Fermented Dairy
Lactose intolerance occurs when the small intestine produces insufficient amounts of the enzyme lactase, which is needed to break down milk sugar into glucose and galactose. When undigested lactose reaches the colon, resident bacteria ferment it, creating hydrogen gas, carbon dioxide, and water retention, which can cause cramping, bloating, and diarrhoea.
However, many individuals who struggle to drink fresh liquid milk find they can comfortably tolerate traditional Greek yogurt or kefir:
- A standard glass of whole milk contains roughly 12g of lactose.
- Authentic Greek yogurt contains roughly 4g to 5g of lactose per serving due to the straining of the whey.
- Kefir often contains less than 2g to 3g of lactose due to prolonged fermentation.
- The starter bacteria within live yogurt also release their own lactase enzymes in the small intestine, assisting your body with natural breakdown.
If you suspect lactose is an issue, start with a single tablespoon of authentic Greek yogurt or kefir, or opt for dairy products clearly marked as lactose-free.
2. FODMAP Considerations
Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols (FODMAPs) are types of short-chain carbohydrates that can be difficult for some sensitive digestive systems to absorb.
- Traditional unstrained milk yogurt is considered high-FODMAP due to its lactose content.
- Small servings (approx. 2 tablespoons or 40g) of strained Greek yogurt are typically classified as low-FODMAP.
- Hidden FODMAPs: Some yogurts marketed specifically for digestive wellness contain added prebiotic fibres such as inulin or chicory root extract. While beneficial for many, inulin is a potent fructan (a high-FODMAP carbohydrate) that can cause significant gas and bloating in individuals with irritable bowel habits. Always check the ingredients panel if you are prone to bloating.
3. The Adjustment Window
If your diet has previously been low in fermented foods and fibre, introducing live cultures and seeds can occasionally cause a brief increase in mild gas or stomach gurgling.
This is typically a normal physiological response as your internal ecosystem adjusts to the influx of active microbes and fermentable substrates. In most cases, starting with small daily amounts (such as 50g of yogurt) and gradually increasing over two weeks allows your system to adapt smoothly.
The Blue Horizon Approach: When Dietary Changes Aren't Enough
Adjusting your diet by introducing live, cultured yogurt, increasing fibre, and reducing ultra-processed foods is a valuable foundation for digestive health. However, dietary adjustments are not a cure-all.
Persistent digestive symptoms—such as chronic bloating, changes in bowel frequency, ongoing fatigue, unexplained weight changes, or skin flare-ups—are complex signals from your body that warrant thorough, structured investigation. For practical advice on tracking symptoms and improving digestion, read this guide to starting a gut-health routine.
THE BLUE HORIZON METHOD
───────────────────────────────────────────────────────────
Step 1: Consult Your GP
Rule out underlying conditions (coeliac disease,
IBD, thyroid imbalances, anaemia).
│
▼
Step 2: Structured Self-Tracking
Keep a detailed 14-day diary of food, symptoms,
energy levels, and lifestyle factors.
│
▼
Step 3: Targeted Blood Testing
Obtain a clear biomarker snapshot to inform
constructive, doctor-led clinical discussions.
Step 1: Consult Your GP First
If you are experiencing persistent digestive changes, your first and most important step is always to book an appointment with your NHS GP.
Your GP can conduct clinical examinations and perform essential standard rule-outs. It is vital to formally rule out conditions such as:
- Coeliac disease (an autoimmune reaction to gluten)
- Inflammatory Bowel Disease (IBD, such as Crohn's disease or Ulcerative Colitis)
- Standard clinical thyroid dysfunction
- Underlying iron deficiency anaemia
Never attempt to self-diagnose complex digestive complaints or completely overhaul your diet without professional clinical guidance, particularly if you have underlying medical conditions.
Step 2: Structured Self-Tracking
Before your medical appointments, spend 14 days maintaining a simple, structured health diary. Rather than focusing solely on what you eat, track the broader picture:
- Dietary Intake: Note when you consume dairy, fermented foods, different fibre sources, and your daily fluid intake.
- Symptom Timing: Record when bloating, cramps, or changes in stool consistency occur (for example, within 30 minutes of eating versus several hours later).
- Broader Lifestyle Context: Record your sleep quality, daily physical activity, and occupational or emotional stress levels. Stress exerts a direct physiological impact on gut motility via the gut-brain axis.
This structured information gives your doctor clear, objective context during your consultation.
Step 3: Targeted Biomarker Testing
If standard preliminary tests have returned normal results, but you still feel fatigued, run down, or out of balance, a comprehensive private blood panel can provide an informative snapshot of your systemic health. You can compare available options in the thyroid blood test collection.
Digestive health does not exist in isolation; it is deeply connected with your hormonal, metabolic, and nutritional status:
- Thyroid Function and Digestion: Your thyroid regulates your body's basal metabolic rate. An underactive thyroid (hypothyroidism) frequently slows down gut motility, leading to chronic constipation, bloating, and fatigue. While standard NHS checks often measure only Thyroid Stimulating Hormone (TSH), a comprehensive panel measuring Free T4, Free T3, and autoimmune markers (Thyroid Peroxidase Antibodies - TPOAb, and Thyroglobulin Antibodies - TgAb) offers a more complete picture of thyroid hormone production and conversion.
- Nutritional Cofactors: Sluggish digestion or low stomach acid can impact nutrient absorption. Evaluating your levels of Ferritin (stored iron), Active Vitamin B12, Folate, and Vitamin D (25-OH) helps verify whether your body is properly absorbing vital micronutrients from your food.
- Systemic Inflammatory Markers: High-sensitivity C-Reactive Protein (CRP) provides a reliable marker of systemic inflammation within the body.
- Stress Hormones and Metabolism: Testing Cortisol and Magnesium helps evaluate how chronic stress might be influencing both your gut function and overall energy levels.
At Blue Horizon, our doctor-led blood testing service offers tiered profiles—ranging from focused assessments to comprehensive systemic panels. For a focused assessment of TSH, Free T4, Free T3, Cortisol, and Magnesium, see the Thyroid Premium Bronze profile. You can also review the wider range of available blood tests when discussing suitable options with your GP.
Practical Summary: Choosing Your Ideal Yogurt
To help you make an informed choice on your next shopping trip, here is a quick summary of what to look for:
- For Maximum Microbial Diversity: Choose authentic, unsweetened kefir. It provides the broadest range of live bacteria and beneficial yeasts to support your digestive transit.
- For High Protein and Satiety: Choose authentic, strained Greek yogurt or Icelandic skyr. These provide high protein (typically 8–12g per 100g) with naturally lower levels of lactose.
- For Plant-Based Diets: Choose unsweetened soya yogurt fortified with calcium, ensuring the label explicitly confirms the presence of live active cultures.
- Check the Label: Look for short ingredients lists (milk and live cultures), avoid products with high added sugars (keep added sugars under 5g per 100g), and avoid yogurts that have been heat-treated after fermentation.
- Feed Your Microbes: Pair your yogurt with high-fibre whole foods like raspberries, chia seeds, ground flaxseeds, and rolled oats to create a nourishing synbiotic meal.
- Follow the Phased Approach: If digestive symptoms persist despite healthy dietary habits, consult your GP first, track your symptoms consistently, and consider targeted biomarker testing to gain a clear view of your overall wellbeing.
FAQ
How often should I eat yogurt to support my gut health?
It is best to consume cultured yogurt in modest amounts on a daily basis. The beneficial bacteria found in yogurt and kefir are transient visitors; they travel through your digestive tract, interact with your immune system and resident microbes, and naturally pass out of the body. Eating a small portion (roughly 100g to 150g of yogurt, or 100ml to 150ml of kefir) every day provides far more consistent support than eating a large bowl once a week.
Is Greek yogurt better for gut health than regular yogurt?
Both authentic Greek yogurt and regular plain natural yogurt can support digestive wellness, but they offer different nutritional strengths. Greek yogurt is strained to remove the liquid whey, which concentrates the protein content and naturally reduces the lactose levels, making it denser, more filling, and often gentler for those with mild lactose sensitivity. Regular plain yogurt is unstrained, meaning it is slightly higher in natural lactose and calcium, but has a lighter, more pourable consistency. Both contain beneficial starter cultures, provided they have not been heat-treated after fermentation.
Can I still eat yogurt if dairy sometimes makes me feel bloated?
Many people who experience mild digestive discomfort from standard liquid milk find they can comfortably enjoy certain types of yogurt. During the fermentation process, live starter cultures break down a substantial portion of the milk sugar (lactose) into lactic acid. Furthermore, strained yogurts (such as authentic Greek yogurt and skyr) lose much of their lactose in the removed whey, and kefir ferments out nearly all of it. If you suspect lactose sensitivity, you can trial small amounts of authentic Greek yogurt or kefir, or choose certified lactose-free cultured dairy. However, if bloating is severe or accompanied by pain, consult your GP.
Does heat treatment destroy the beneficial bacteria in yogurt?
Yes. Pasteurisation or heat treatment applied after the fermentation process kills the live bacterial cultures. While heat-treated, shelf-stable yogurts still provide protein and calcium, they no longer contain living microorganisms capable of delivering probiotic benefits. To ensure your yogurt contains living bacteria, look for refrigerated products that explicitly state "contains live cultures" or "live and active cultures" on the packaging, and avoid any labels that mention "pasteurised after culturing".
