Food and Water Safety When Travelling: Avoiding Illness Abroad

Introduction: The Hidden Risks on the Table

Travelling is one of the most enriching experiences a young adult can have. Exploring new countries, tasting unfamiliar foods, and immersing yourself in different cultures are among the genuine joys of life. But alongside these pleasures comes a risk that many travellers underestimate until they find themselves flattened in a foreign hostel, unable to stray far from the bathroom: food and waterborne illness.

Traveller's diarrhoea alone affects between 20 and 60 per cent of international travellers depending on destination and behaviour. Diseases such as typhoid, hepatitis A, cholera, and various forms of food poisoning send thousands of people to hospital every year while abroad. The good news is that many of these illnesses are largely preventable with knowledge and a few consistent habits.

Understanding the Risk: Why Food and Water Are Dangerous Abroad

The fundamental issue is exposure to pathogens - bacteria, viruses, and parasites - to which your immune system has not previously been exposed. When local populations consume the same food and water, they have often developed some degree of immunity to locally prevalent strains of bacteria. A foreign traveller has no such protection.

Contamination can enter the food and water supply at many points: agricultural practices involving untreated water or faecal fertiliser, inadequate sewage treatment reaching water supplies, food handlers with poor hygiene, inadequate refrigeration, or simply different standards for what constitutes safe food preparation.

The risk varies dramatically by destination. Travel to Northern and Western Europe, North America, Australia, New Zealand, and Japan carries relatively low food and water safety risks compared to travel to parts of Sub-Saharan Africa, South and Southeast Asia, Central America, and some regions of South America and the Middle East. This does not mean you should avoid high-risk destinations; it means you should be more vigilant and better prepared when visiting them.

Water Safety: What You Can and Cannot Drink

Unsafe drinking water is one of the leading causes of traveller's illness. The key question to answer before drinking any water in a new destination is: is the tap water safe to drink here?

In many countries the answer is yes. Tap water in the UK, Germany, France, the Netherlands, Scandinavia, Switzerland, Australia, Canada, Japan, Singapore, and New Zealand is generally safe and of high quality. In many other countries, including large parts of India, Indonesia, Mexico, Egypt, Morocco, Peru, Vietnam, the Philippines, and much of Sub-Saharan Africa, tap water is not safe to drink and should be avoided entirely.

Bottled water is the safest and simplest solution in high-risk destinations, but it comes with caveats. Buy bottled water from reputable shops or large supermarkets rather than street vendors. Check that the seal is intact before opening - in some areas, used bottles are refilled with tap water and resealed. Carbonated water is harder to adulterate convincingly and can be a useful fallback if you are unsure.

Boiling water for at least one minute (three minutes at altitudes above 2,000 metres) kills virtually all biological contaminants and is reliable wherever you have access to a heat source. Portable water filters and purification tablets are useful for travellers in more remote areas or those on extended trips. Look for filters certified to remove bacteria and protozoa (such as giardia and cryptosporidium). Iodine or chlorine tablets are effective against bacteria and viruses but do not reliably remove protozoa, so check the product specifications.

UV purification pens - devices that emit ultraviolet light to inactivate pathogens in water - are effective against bacteria, viruses, and protozoa in clear water, and are a convenient option for travellers.

Ice deserves special mention. In any country where tap water is not safe, ice made from tap water is equally unsafe. "Avoid ice" is a common piece of travel advice that is genuinely important. Reputable hotels and restaurants in tourist areas increasingly use filtered or purified water for ice, but this cannot always be relied upon, particularly in local establishments or street food settings.

Brushing your teeth with tap water in high-risk destinations carries a small but real risk. Use bottled water for this purpose if you are unsure about tap water safety.

Food Safety: The Key Principles

The phrase often used in travel medicine is "boil it, cook it, peel it, or forget it." While this is a simplification, it captures the core principle: heat kills pathogens, physical barriers such as intact fruit skins prevent contamination, and if you cannot verify either of these things, it is better to pass on the food.

Freshly cooked food served hot is generally the safest option in high-risk environments. The heat of cooking kills the vast majority of foodborne pathogens. Street food cooked fresh in front of you - even in countries with generally poor food hygiene - is often safer than buffet food that has been sitting at room temperature for hours, or salads washed in contaminated water.

Raw fruits and vegetables are a significant source of contamination in high-risk countries because they may have been grown using contaminated water, handled by people with poor hand hygiene, or washed in unsafe water. Fruit that you peel yourself - bananas, oranges, mangoes, avocados - is safe once the skin is removed. Salads, raw vegetables, and unpeeled fruits are higher risk.

Meat should always be thoroughly cooked. Undercooked meat, particularly poultry and pork, can carry salmonella, campylobacter, and a range of other pathogens regardless of which country you are in. In some regions, tapeworm and other parasitic infections transmitted through undercooked meat are an additional concern.

Seafood and shellfish carry particular risks in tropical and subtropical regions. Shellfish such as oysters and mussels filter large volumes of water and can concentrate pathogens from the surrounding sea, including cholera bacteria and hepatitis A virus. Reef fish in tropical areas can carry ciguatera toxin, which is not destroyed by cooking and causes a distinctive neurological syndrome. Freshwater fish and crustaceans in some parts of Asia can carry liver flukes and other parasites if eaten raw or undercooked.

Dairy products from uncontrolled sources carry the risk of brucellosis, listeria, and other infections if made from unpasteurised milk. In many countries, street vendors and local markets sell unpasteurised cheeses and milk products without labelling them as such. This is particularly relevant in parts of the Middle East, Latin America, and some Mediterranean countries.

Assessing Restaurants and Food Stalls

You do not need to restrict yourself to international hotel restaurants to eat safely. With a little observation, you can assess the risk level of most food establishments.

High turnover is a good sign. A food stall or restaurant with lots of customers is likely turning over its ingredients quickly, reducing the risk of food sitting around and spoiling. A place that looks deserted at mealtimes may be a warning sign, though it is not conclusive.

Observe how food is handled. Are raw meats handled separately from cooked foods and vegetables? Are surfaces reasonably clean? Does the food appear to be stored at appropriate temperatures? Are there obvious signs of poor hygiene? You do not need a white-glove inspection; you are looking for obvious warning signs.

Be cautious with buffets and salad bars, particularly in warm climates, as food sitting at room temperature provides ideal conditions for bacterial growth. The danger zone for bacterial multiplication is between 5 and 60 degrees Celsius; food should be kept below or above this range.

Ask fellow travellers and check recent travel forums for recommendations. Travellers who have been in a location for several days can be a valuable source of up-to-date information about which food options are safe and which have caused illness.

Before You Travel: Vaccinations and Preparation

Several important vaccines protect against foodborne and waterborne illnesses. Typhoid vaccine is recommended for travel to South and Southeast Asia, Sub-Saharan Africa, Latin America, and other regions where typhoid fever is prevalent. It is available as an injectable vaccine or oral capsules, and while it is not 100 per cent effective, it significantly reduces risk.

Hepatitis A vaccine is recommended for travel to most of the developing world and is highly effective - a two-dose course provides protection for 20 years or more. Given that hepatitis A is transmitted via contaminated food and water and can cause serious liver illness, this is one of the most valuable travel vaccines available.

Cholera vaccine (Dukoral) is available in many countries as an oral vaccine. It offers partial protection against cholera and also provides some protection against enterotoxigenic E. coli (ETEC), a major cause of traveller's diarrhoea.

Visit a travel health clinic or GP ideally six to eight weeks before your departure to discuss which vaccines are appropriate for your destination and to get prescriptions for any preventive medications such as malaria prophylaxis if needed.

If You Do Get Ill

Despite all precautions, gastrointestinal illness during travel is common. The most important treatment for most cases of traveller's diarrhoea is oral rehydration - replacing the fluids and electrolytes lost through diarrhoea and vomiting. Oral rehydration salts (ORS) are cheap and widely available in pharmacies worldwide, and carrying a few sachets in your first aid kit is sensible.

Most cases of traveller's diarrhoea are self-limiting and resolve within a few days without specific treatment. Anti-diarrhoeal medications such as loperamide can reduce symptoms and are useful when you need to travel, but they slow the gut rather than addressing the underlying infection. They should be avoided if you have a fever or blood in your stool, as these suggest a more serious bacterial infection where stopping the gut from moving can worsen matters.

Antibiotics are sometimes prescribed for traveller's diarrhoea, particularly for moderate to severe cases. Travel clinics in many countries offer standby prescriptions - a prescription you carry with you to fill and use if necessary. The appropriate antibiotic depends on the region you are visiting and current resistance patterns; your travel clinic can advise.

Seek medical attention if your symptoms are severe, if you have a high fever, if there is blood in your stool, if you are unable to keep fluids down, or if symptoms have not improved after 72 hours. Dehydration can become serious quickly, particularly in hot climates.

Travelling Well and Eating Wisely

Food is one of the great pleasures of international travel, and the goal of food safety is not to prevent you from engaging with local cuisine but to help you do so safely. With the right vaccines, basic hygiene habits, and a little informed caution, you can eat adventurously and stay well throughout your travels. The rules are not complicated: drink safe water, eat freshly cooked food, peel your own fruit, and pay attention to what your body tells you. Most people who follow these principles travel extensively throughout their lives without serious illness.