How to Avoid Food Poisoning

The holiday season is almost upon us and families, many with children, will be looking forward to their annual summer holiday. One of the most annoying things you can encounter when travelling is vomiting or diarrhea that’s either due to travelling itself, or even worse, possible food poisoning.

Some 40 per cent of all travellers that venture outside western countries will experience an episode of diarroea, which we call “travellers’ diarrhea”. In most cases it’s a self-limiting disease that will run its course and you’ll feel better again after one to five days. A visit to the doctor will not always be necessary, but if complaints persist and you cannot drink enough fluids such a visit will indeed be necessary.

The most common causes of travellers’ diarrhea are listed below.

Food poisoning water bottles


Drinking water contaminated with faeces, or eating something that might have been contaminated by such water will make you ill. In many less-developed countries in the Far East, Africa and South-America, water systems are not up to western standards of hygiene, despite local government requirements. Furthermore, sewage systems there can be old fashioned, inefficient and in some places even non-existent. This can result in residues of human excrement mixing with irrigation water, meaning that all crops, such as vegetables and fruits grown on land irrigated by this water, can be contaminated. Tap water could also be contaminated.

Therefore, it’s always better to be safe rather than sorry and drink from sealed, bottled drinking water in these countries. You should also wash your hands frequently and use disinfectant. Items of food, like fruits and vegetables, that have not been properly washed with water treated by filtration and/or chlorination, might be contaminated with human faeces. If you eat them you’ll get sick.

Food poisoning street food

Fresh fruit, vegetables and street food

Indian street markets and many small roadside food stalls can be tempting because what they serve looks and smells really appetising. You may wonder why the locals won’t get sick after eating this food, but you will. The answer has everything to do with the difference between the immune systems of locals and travellers. The locals’ frequent exposure to different kinds of bacteria, mainly when they are young, builds up their immunity and this gives them more protection against the kinds of infections these local foods can cause. However, even the locals can get sick from the so-called pathogenic strains of bacteria.

Other factors are that the people who cook at these roadside stalls may not work according to western standards of hygiene, and, very importantly, the quality of the food they serve and the way they cook it could also make you ill. Bacteria grows quicker in a hot and humid climate and that goes hand-in-hand with a greater risk of food poisoning.

Ice cream and buffets

Ice cream and buffet food are the most common items of food that are contaminated by the kind of bacteria that will make you ill, particularly in a hot and humid climate. The two main reasons for this are that ice cream and buffets are either not kept cool enough or turnover of food in buffets (in terms of both amount and time) could be insufficient. Both reasons cause bacteria growth, or even worse, bacteria can produce toxin. This can make the elderly, pregnant women and young children, in particular, very ill. Bacteria growth can make you ill within one to three days and bacteriological toxin can do the same between 4 and 24 hours after eating it. The latter is what can really be seen as food poisoning.

Food poisoning street food (2)

Fish and meat

Only eat well-prepared and well-cooked fish or meat. In a reliable environment, such as western-standard kitchens and high-end international hotels, you can usually trust the food in their buffets and on their menus. Most of these establishments work according to western hygiene standards and it should be safe to eat shellfish and fresh fish in them. However, bear in mind that fish is more sensitive to the growth of bacteria than meat is, which makes it more susceptible to contamination. The reason for this is that fish contains more nutrients than meat and nutrients are an excellent growth medium for bacteria.

Food poisoning diarrhea

Preparing for your trip

In the knowledge that there is a 40 per cent likelihood of getting travellers’ diarrhea, make sure you take sufficient medication, like loperamide, with you. This medication can help if you contract diarrhoea and it gets worse. And don’t forget, you can always visit our Travel Clinic for more information and advice, also for the vaccinations that might be necessary for your travel destination.

Finally, there’s a good catchphrase you should bear in mind when eating in less-developed countries:

“Boil it, cook it, peel it… or forget it!”

What you should know about what you eat and drink while travelling abroad

  • Avoid tap water, buy sealed, bottled water.
  • Avoid fruits and vegetables. Crops grown on land irrigated by water, can be contaminated.
  • Wash your hands frequently and use disinfectant.
  • The immune systems of locals are more resistant for infections than those of travellers.
  • Bacteria grow quicker in a hot and humid climate and that goes hand-in-hand with a greater risk of food poisoning.
  • Avoid ice cream and buffet food.
  • Eat well-prepared and well-cooked fish or meat.
  • Bear in mind that fish is more sensitive to the growth of bacteria than meat is.
  • Take along medication for diarrhea.
Posted by:   Didi Aaftink  | 
Join the conversation Show comments


Very ironic but the worst case of traveller’s diarrhea I ever had was after eating at a high end bistro in Paris.

Didi Aaftink

Dear JeroenW, thank you for your comment. So sorry to hear this, unfortunately, although very rare, this type of foodpoisoning could happen in any high end restaurant or hotel. In your case really “bad luck”. In Europe, by law, all restuarants should be checked on hygien procedures.


This is a very nice and useful blog post. The thing I feel inclined to add is to be very specifically aware of street food. In particular the kind -as you highlight here- which has been standing/exposed for a while before being served to you. Feeling sick can really ruin your holidays so in that instance anything which has not been boiled/cooked/peeled in front of you should make your radar react! (the last day of a great trip to Argentina was ruined by my partner a few years ago feeling very hungry and going to the first street-food place, despite having resisted for 2 weeks. The flight back to Paris & London was truly memorable for him -for the wrong reasons!)

Michael Garren

In metropolitan cities, I carefully search for the food carts that are patroned by locals. Another key point, I always search for the ones which are busiest among the other stalls as the prepared foods “turnover rate” is higher as it isn’t sitting “out” slowly gathering bacteria. Bangkok is a good example as this is a hot and humid climate and it is important to take notice of food handling and preparation. Bon Appétit!

Henk VTC Travel Solutions

What I want to add is this. As s professional business travel organiser I travel a lot. What I see happening is that travellers (many, not all) drink a lot of alcohol, eat (too?) much meat. This in combination with drinking not enough water, eating not enough fruit & vegetables, going to bed (too?) late and not being adjusted to another climate makes travellers very vulnerable. My advise: less alcohol, more water and vegetables, take time to adjust, make sure that you sleep enough, do some excercise and NJOY!


The water in my city in Argentina is excellent. I have sometimes stomach problems too when I travel. It is because of difference of minerals in the water. Also difference of climate and food plays a role. Anti diarrhea pills help a lot.


Good information! Thanks! However as a (very) frequent flyer for more than a decade i never experienced any problem even eating the strangest food from any. Asain street food ‘restaurant of stall’ The only thing i keep in my mind is, drink plenty water from sealded bottles.

Oddvar Walle Jensen

I am an Flying Blue member with mershipnumber 2063971430 but have forgotten my pincode or passwoed. I have trird the back up question about my first car, but cant remember becauset I have had over 20 cars both private and comany cars.
can you please help ?
If you can set a password I would like to have this : fax2213

Respond on email or SMS +4793245328

best regards from Norway.
Oddvar Walle Jensen


YMMD with that anrews! TX


Avoid salad too.

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