Idli, Vada And Sambar-Rice Leave 97 Employees Sick In Bengaluru: When Summer Heat Raises Fermented Food Risks

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It was a regular workday until one canteen meal in Devanahalli, Bengaluru, left nearly a hundred people unwell within hours. The incident comes shortly after a similar case involving a family in Ahmedabad, raising fresh concerns around something most Indian kitchens rely on daily: fermented food.

97 Employees Fall Ill After Eating Everyday Food

Photo Credit: Image is AI-generated

Recently, 97 employees at a private company in Devanahalli, Bengaluru were hospitalised after eating canteen food that included idli, vada, and sambar-rice.
What makes this incident unsettling is how routine everything was:

• The food wasn't unusual
• The setting wasn't risky
• The symptoms-vomiting, diarrhoea, stomach pain started within hours

Health officials collected food samples, and investigations are still ongoing to confirm the exact cause. At first glance, this looks like a classic case of food poisoning. But it's not just about one bad meal, it highlights how quickly things can go wrong when food is prepared and stored in bulk, especially in summer.

So What's Really the Risk With Fermented Food in Summer?

The Bengaluru case shows what can happen when food safety fails. But experts are clear on one thing: fermented food becomes more sensitive in heat.

Here's why:

It spoils faster

Fermented batter is moist, nutrient-rich, and already full of microbes-ideal conditions for bacterial growth when temperatures rise.

Over-fermentation changes everything

In hot weather, batter can ferment too quickly, turning overly acidic and unstable, which disrupts the balance of good bacteria.

Contamination risk increases

Exposure to air, unclean utensils, or improper handling allows harmful bacteria like Bacillus cereus to grow, leading to food poisoning.

Storage becomes critical

If refrigeration breaks at any point during transport, storage, or in kitchens-bacteria multiply rapidly.

This isn't about fermented food being unsafe. It's about how quickly it can turn unsafe under the wrong conditions.

Photo Credit: WISE

What To Do About Fermented Food Risks

Safe fermentation depends on proper control at every stage, not casual kitchen conditions. In warm climates especially, small mistakes can quickly turn a healthy process into a risky one.

1. Control Temperature Strictly (This Is The Most Important Step)

Safe fermentation depends on stable, controlled temperature rather than fluctuating room conditions. Leaving food to ferment on a kitchen counter in changing heat can make the process unpredictable and unsafe.

What to do:

• Ferment within recommended temperature ranges depending on the food
• Refrigerate immediately once fermentation is complete
• Avoid leaving fermented food sitting out in hot conditions

2. Ensure Proper Acidity (pH Is Critical For Safety)

Fermented food is considered safe only when it reaches a pH of 4.6 or lower, which creates an environment where harmful microbes struggle to survive.

Why this matters:

If acidity does not develop properly, harmful bacteria may survive even if the food looks and smells normal.

What to do:

• Follow proper fermentation timelines
• Do not rely on appearance or smell as safety indicators

3. Maintain Strict Hygiene (WHO Core Principle)

Food safety guidelines from global health authorities stress hygiene as a non-negotiable part of fermentation.

What to do:

• Wash hands, utensils, and surfaces thoroughly
• Use clean, preferably sterilised containers
• Keep raw and cooked foods strictly separate to avoid cross-contamination

4. Use Reliable Fermentation Methods (Not Random DIY)

Improper fermentation conditions are one of the main reasons for safety failures. Key factors must be controlled consistently.

What to do:

• Stick to tested recipes or trusted starter cultures
• Avoid experimental or "guess-based" fermentation, especially in hot climates
• Maintain consistency in time, temperature, and culture used

5. Use Proper Storage And Containers

Storage plays a major role in preventing contamination after fermentation is complete.

What to do:

• Store food in clean, airtight containers
• Refrigerate promptly after fermentation
• Minimise repeated exposure to air and moisture

6. Don't Rely On Smell Or Taste Alone

Unsafe fermented food may still look and smell normal, which makes sensory checks unreliable.

What to do:

• If fermentation conditions were not controlled properly, avoid consuming the food
• When in doubt, discard it

7. Follow "Critical Control Points" (Used By Food Inspectors)

Food safety systems focus on monitoring key stages where risks can develop.

What to do:

• Treat fermentation as a step-by-step controlled process
• Monitor preparation, fermentation, and storage stages carefully
• Ensure safe final conditions such as correct pH and refrigeration

8. Be Extra Cautious In Hot And Humid Climates

Heat and humidity accelerate microbial activity and can disturb safe fermentation balance.

What to do:

• Shorten fermentation time during summer months
• Refrigerate earlier than usual
• Avoid preparing large batches that take longer to control

Why This Matters Right Now

The Bengaluru incident is a reminder of how small lapses-temperature, timing, hygiene can escalate quickly, especially in Indian summers. The case shows how fast contamination can spread in large settings.

Fermented food isn't the problem. It's the conditions around it. In cooler weather, there's room for error. In summer, there isn't. The difference between safe and risky often comes down to something simple: how long it sat out, and how it was handled before it reached the plate.