Sodium in the Vietnamese Diet: Where It Comes From, Why It Matters, and How to Reduce It Without Losing Flavour
FOOD & NUTRITION SCIENCECOOKING & CULINARY PRACTICE
Category: Food & Nutrition Science
Secondary category: Cooking & Culinary Practice
Last reviewed: 28 September 2026
Salt is deeply woven into the way food tastes in Viet Nam. It is present not only as table salt, but also in fish sauce, soy sauce, seasoning powders, dipping sauces, broths, preserved foods and many packaged products. These ingredients are part of familiar cooking practices and, in many cases, part of the character of Vietnamese dishes.
That is why reducing sodium should not simply mean telling people to “eat bland food.” A more useful question is how to reduce unnecessary sodium while preserving flavour, familiarity and enjoyment.
The need is real. Viet Nam’s 2021 national STEPS survey found that adults aged 18–69 consumed an average of 8.1 g of salt per day, down from 9.4 g in 2015 but still around 1.6 times the World Health Organization recommendation of less than 5 g per day for adults. The National Institute of Nutrition continued to highlight the same 8.1 g figure in August 2026 as an important nutrition and noncommunicable-disease concern. [1,2]
Key Points
Salt and sodium are related, but they are not the same thing. Five grams of salt contains approximately 2,000 mg of sodium. In Viet Nam, sodium comes from many sources, including salt, fish sauce, soy sauce, seasoning powders, stock products, dipping sauces, processed foods and meals eaten outside the home. The best-established health effect of a high-sodium diet is raised blood pressure, which increases cardiovascular risk. Reducing sodium does not require abandoning Vietnamese food; herbs, aromatics, acidity, spices, texture and cooking technique can carry more of the flavour while salty ingredients are used more deliberately. Potassium-containing lower-sodium salt substitutes may help some adults but are not suitable for everyone, particularly people with impaired kidney function or other circumstances that compromise potassium excretion.
Salt and Sodium Are Not the Same Thing
The words salt and sodium are often used interchangeably, but they refer to different things. Table salt is mainly sodium chloride, and sodium accounts for roughly 40% of its weight. As a practical conversion, 1 g of salt contains about 400 mg of sodium, so 5 g of salt contains about 2,000 mg of sodium. [3]
This distinction matters when reading food labels. Sodium is usually expressed in milligrams, while public-health guidance is sometimes communicated in grams of salt. More importantly, sodium in the diet does not come only from visible salt crystals. Fish sauce, soy sauce, seasoning powders, stock products, dipping sauces, monosodium glutamate and many processed foods can all contribute sodium.
Why Sodium Deserves Particular Attention in Viet Nam
The most recent nationally representative STEPS data available show mean salt intake of 8.1 g per day among Vietnamese adults aged 18–69 in 2021, including approximately 9.1 g among men and 7.1 g among women. Although this represented an improvement from 2015, intake remained substantially above the WHO adult recommendation. [1]
Where the sodium comes from is equally important. In August 2026, the National Institute of Nutrition noted that much of the sodium in Vietnamese diets still comes from salt, fish sauce, seasoning powders, bouillon-type products and MSG used during cooking or eating. Habits such as dipping foods in salty sauces or adding salty broth also contribute. At the same time, sodium from processed foods, instant noodles, snacks and meals eaten outside the home is becoming more important, particularly in urban settings and among younger people. [2]
This gives Viet Nam a particular practical challenge. Sodium reduction cannot focus only on packaged foods, nor can it focus only on what happens in the home kitchen. It needs to address both food preparation and the wider food environment.
WHO Viet Nam reflected this broader approach in August 2026, highlighting sodium benchmarks for different food categories, nutrition labelling and ongoing work toward a Nutrition Profiling Model for Viet Nam that could support future front-of-pack labelling and other nutrition policies. [5]
Why Does Too Much Sodium Matter?
Sodium is an essential nutrient. It is involved in fluid balance, nerve transmission and muscle function. The problem is not that sodium exists in the diet, but that intake can substantially exceed physiological needs.
The best-established health effect of a high-sodium diet is raised blood pressure. Elevated blood pressure, in turn, is an important risk factor for cardiovascular disease, including heart disease and stroke. WHO also identifies associations between high-sodium diets and other adverse health outcomes, but blood-pressure reduction remains the central evidence-based rationale for population sodium-reduction strategies. [3]
WHO currently recommends that adults consume less than 2,000 mg of sodium per day, equivalent to less than 5 g of salt. For children aged 2–15 years, the adult maximum should be adjusted downward according to energy requirements. [3]
These are population recommendations, not individualized prescriptions for every clinical situation. People with kidney disease, heart failure, disorders of fluid or electrolyte balance or other relevant medical conditions may require individualized medical and nutrition advice.
Where Does Sodium Come From in a Vietnamese Meal?
Some sources are obvious. Salt added to a dish clearly contributes sodium. Others are easier to overlook because several sodium-containing ingredients may be layered into the same meal.
Consider a bowl of noodle soup. Sodium may come from salt used in the broth, fish sauce or soy sauce, seasoning powder, stock products, processed meat or fish products and condiments added at the table. In a September 2026 article, the National Institute of Nutrition specifically noted that a substantial amount of the sodium in dishes such as phở can remain dissolved in the broth. Drinking all of the broth can therefore increase sodium intake compared with eating the solid ingredients and consuming less of the liquid. [13]
A stir-fried dish can have a similar layering effect. A modest amount of fish sauce may not seem excessive, but combining it with salt, soy sauce, seasoning powder and a salty dipping sauce can raise the total considerably.
The more useful question is therefore not whether a meal contains salt. Most meals contain some sodium. It is how many sodium-containing ingredients are being layered into the meal, in what quantities, and whether all of them are necessary.
Salty Taste Is Not a Precise Measure of Sodium
Taste can help guide cooking, but it is not a measurement of sodium content. Two foods that taste similarly salty may contain different amounts of sodium because of differences in formulation, water content, portion size and other flavour components.
A food that does not taste particularly salty may still contribute a meaningful amount of sodium if it is eaten frequently or in a large portion. This is one reason nutrition labels can be useful.
Under Circular No. 30/2026/TT-BYT, effective from 10 July 2026, sodium is one of the basic nutrition components that must generally be declared for foods within the Circular’s scope, subject to the applicable exemptions. Sodium is expressed in milligrams, and Appendix II uses 2,000 mg as the dietary reference value for labelling purposes. [6]
That value is useful as a reference for interpreting a label. It should not be treated as an individualized treatment target.
Reducing Sodium Does Not Mean Removing Flavour
One of the most common barriers to sodium reduction is the fear that food will simply stop tasting good, but that does not have to happen. Saltiness is only one dimension of flavour.
Vietnamese cooking already has a rich palette of ingredients and techniques that can create complexity: garlic, shallot, ginger, lemongrass, chilli, pepper, lime, tamarind, vinegar, fresh herbs, toasted spices, grilling, roasting, browning and contrasting textures. Unsalted roasted nuts or seeds can also contribute texture and flavour in appropriate dishes.
The objective is not to replace every salty ingredient with something else. It is to avoid asking salt, fish sauce or other salty condiments to do all of the flavour work.
A soup built mainly around saltiness may become noticeably weaker when sodium is reduced. A soup with aromatic vegetables, herbs, spices, acidity, umami and good cooking technique may tolerate a more modest amount of salty seasoning while still tasting complete.
Umami can help build savouriness, but this also requires nuance. Many commercial sauces and seasonings that provide umami contain substantial sodium themselves, so an “umami” product should not automatically be regarded as a low-sodium substitute.
Start With the Salt and Seasonings Added During Cooking
For many Vietnamese households, one practical starting point is simply to notice how many sodium-containing ingredients are being added during preparation. If a dish already includes fish sauce, does it also need salt and seasoning powder? If a broth is already well seasoned, how much additional dipping sauce is really needed?
This is not a rule that every recipe should contain only one salty ingredient. Different ingredients serve different culinary functions. The aim is to recognize stacked sources of sodium and identify places where the amount can be reduced without fundamentally changing the dish.
Gradual reduction can also be more realistic than an abrupt change. The National Institute of Nutrition notes that taste can adapt when salt is reduced progressively, allowing people who are accustomed to saltier foods to become more comfortable with lower levels over time. [13]
Rethink Dipping, Pouring and Broth
What happens at the table matters as much as what happens during cooking. Fish sauce and other dipping sauces are important parts of many Vietnamese meals, and a sodium-reduction strategy does not need to pretend that they should simply disappear.
Instead, think about amount and use. A smaller dipping portion, dipping rather than soaking, and using lime, chilli, garlic or other aromatic ingredients to add complexity can reduce reliance on pure saltiness.
Broth deserves similar attention. In noodle soups such as phở, bún and hủ tiếu, a substantial part of the sodium may remain in the liquid. The National Institute of Nutrition recommends not routinely consuming all of the broth and limiting additional salty condiments as practical ways to reduce intake without eliminating these familiar foods. [13]
The goal is not to make a traditional meal unrecognizable. It is to understand where much of the sodium is concentrated and decide how much is necessary for enjoyment.
Build Flavour in More Than One Way
Lower-sodium cooking becomes easier when other sensory dimensions are strong. Fresh herbs contribute aroma; lime, vinegar and tamarind contribute acidity; ginger, lemongrass, garlic, shallot, pepper and chilli create aromatic complexity; and grilling, toasting or browning can add depth. Texture matters too.
The principle is to build flavour complexity rather than simply build saltiness.
This is one of the places where a culinary approach adds value to a public-health message. “Eat less salt” gives us the direction. Cooking skills help determine how to get there without losing the pleasure of food.
Use Nutrition Labels When Shopping
The kitchen begins before cooking, at the point of purchase. When choosing between similar packaged products, compare sodium using the same reference amount, ideally per 100 g or 100 ml where both products provide that information.
A product showing 300 mg of sodium per serving cannot be directly compared with another showing 500 mg per 100 g until the serving size and reference amounts are understood. Then consider how much of the product will actually be used. A sauce can have a high sodium concentration but be used in a very small quantity, while another food can contribute more total sodium because the entire package is eaten.
Viet Nam has also begun addressing sodium at the food-system level. In March 2024, the then General Department of Preventive Medicine issued Official Letter No. 249/DP-KLN, recommending maximum sodium benchmarks for 11 main food categories and 46 subcategories of processed and prepackaged foods. These are recommended benchmarks, not a mandatory universal sodium ceiling for all foods. [4]
WHO Viet Nam reported in August 2026 that these benchmarks are intended to encourage reformulation and that work on a national nutrient profiling model is continuing. [5]
Think Across the Whole Meal, Not Just One Product
Sodium adds up across a meal. A salty soup, a well-seasoned protein dish and a dipping sauce may each seem reasonable in isolation but together create a high-sodium meal.
The reverse is also true. An ingredient that contains sodium can still fit into a meal built largely around vegetables, grains, legumes, fresh foods and other components that contribute relatively little sodium.
This is why it is more useful to ask where the sodium is coming from, how much is being used, how often the food is eaten and what else is in the meal than to divide foods into simple “allowed” and “forbidden” categories.
What About Sea Salt, Rock Salt or Himalayan Salt?
Changing the colour, origin or level of processing of salt does not make its sodium disappear.
The National Institute of Nutrition noted in May 2026 that sea salt, rock salt and Himalayan-type salt remain largely sodium chloride, with sodium representing roughly 40% of their weight. Although less refined salts may contain small amounts of minerals such as magnesium or potassium, those amounts are too small to make salt a useful source of these nutrients. [8]
Replacing ordinary salt with a more expensive “natural” salt should therefore not be confused with a sodium-reduction strategy.
Iodine is a separate consideration. WHO recommends that salt consumed should be iodized, while overall salt intake should still be reduced. These goals are compatible: use less salt overall, while ensuring that the salt that is used is appropriately iodized. [3,8]
What About Lower-Sodium Salt Substitutes?
Lower-sodium salt substitutes replace some sodium chloride with another mineral salt, most commonly potassium chloride. They can lower sodium exposure while retaining some salty taste.
In January 2025, WHO issued its first guideline specifically addressing these products. Within an overall sodium-reduction strategy, WHO conditionally suggests that adults in the general population who choose to use table salt replace regular table salt with a potassium-containing lower-sodium salt substitute. [9]
The recommendation does not apply to children or pregnant women and excludes people with impaired kidney function or other conditions or circumstances that may compromise potassium excretion, including some people taking potassium-sparing medicines or supplements. This matters because excessive potassium can be dangerous for susceptible individuals.
There is also an important household consideration. WHO notes that if someone in a household is at risk of hyperkalaemia, a potassium-containing lower-sodium salt substitute should not be used to prepare a shared family meal that person will eat. [9]
Lower-sodium salt substitutes therefore should not be treated as a universal solution. They also address only discretionary salt. They do not remove sodium that is already present in fish sauce, soy sauce, processed foods, restaurant food or other sodium-containing products.
What About Monosodium Glutamate?
Monosodium glutamate, commonly known as MSG or bột ngọt/mì chính, contains sodium and contributes to total sodium intake. It should therefore be included when thinking about all of the sodium-containing seasonings used in a meal.
At the same time, MSG should not be treated as nutritionally identical to table salt. By weight, MSG contains roughly one-third as much sodium as sodium chloride. Research on food reformulation and sensory acceptability suggests that in some savoury foods, replacing part of sodium chloride with MSG or other umami sources can reduce total sodium while maintaining palatability. However, the evidence is mainly about partial substitution in specific formulations; it does not mean that simply adding MSG to an already salty recipe reduces sodium. [14]
For everyday cooking, the practical message is therefore straightforward: do not demonize one seasoning, but do not ignore its sodium either. Look at the combined amount of sodium from salt, fish sauce, soy sauce, seasoning powders, MSG, stock products, packaged foods and dipping sauces.
Sodium Reduction Is Not Only an Individual Responsibility
People make food choices within a food environment. Packaged foods, restaurant and street foods, delivery platforms, school and workplace food, product formulation and labelling can all affect sodium exposure. Asking individuals simply to “use less salt” therefore addresses only part of the issue.
WHO’s SHAKE the Salt Habit, 2nd edition, released in May 2026, promotes a comprehensive sodium-reduction strategy that includes food reformulation, nutrition labelling, public procurement standards, marketing measures, fiscal approaches and behaviour-change communication. [10]
In Viet Nam, Circular No. 30/2026/TT-BYT has strengthened nutrition-labelling requirements, including sodium information for foods within scope, recommended sodium benchmarks are available for selected processed and prepackaged foods, and work on a national nutrient profiling model is under way. [4–6]
Cooking skills and food literacy can support these policies. They cannot substitute for them.
When Individual Advice Matters
Most people can benefit from greater awareness of excessive sodium intake, but not everyone needs exactly the same strategy. People with hypertension, chronic kidney disease, heart failure or other conditions affecting sodium, fluid or potassium balance may require individualized advice. Medication use can also matter.
Particular caution is needed with potassium-containing lower-sodium salt substitutes. Less sodium does not automatically mean safer for every person. People who may have impaired potassium excretion should not use these products without appropriate assessment or advice. Iris
Population guidance can support everyday food choices, but medical and clinical nutrition management should remain individualized where necessary.
From “Eat Less Salt” to Better Cooking
“Eat less salt” is a useful public-health message, but it is culinarily incomplete. For a Vietnamese kitchen, sodium reduction becomes more practical when translated into everyday questions: How many salty seasonings are being layered into one dish? How much broth is actually being consumed? Does a dipping sauce need to be used in the same amount every time? Could a lower-sodium packaged option work equally well? Could herbs, aromatics, acidity, texture and cooking technique carry more of the flavour?
These changes do not require Vietnamese food to become less Vietnamese. In fact, the diversity of Vietnamese herbs, aromatics, vegetables, textures and cooking techniques provides many ways to build flavour without relying overwhelmingly on saltiness.
The goal is not a flavourless meal. It is a meal in which salt is one part of flavour rather than the flavour itself.
For Culinary Medicine Vietnam, that is the more useful way to approach sodium: understand where it comes from, reduce it where practical, preserve the pleasure and cultural meaning of food, and make changes people can realistically maintain.
References
Ministry of Health of Viet Nam and World Health Organization. National Survey on the Risk Factors of Noncommunicable Diseases in Viet Nam, 2021 (STEPS 2021). Mean salt intake among adults aged 18–69: 8.1 g/day.
National Institute of Nutrition, Viet Nam. Bệnh không lây nhiễm tăng, cần thay đổi từ chính bữa ăn [Noncommunicable diseases are increasing: change needs to begin with the meal]. 21 August 2026. Viện Dinh Dưỡng Quốc Gia
World Health Organization. Sodium reduction. Updated 11 May 2026. World Health Organization
General Department of Preventive Medicine, Ministry of Health of Viet Nam. Official Letter No. 249/DP-KLN dated 28 March 2024, Recommendations on maximum sodium content for selected processed and prepackaged foods. THƯ VIỆN PHÁP LUẬT
World Health Organization Viet Nam. Speech of Dr Angela Pratt on Salt Reduction and Solutions to Promote a Healthy Diet. 19 August 2026. World Health Organization
Ministry of Health of Viet Nam. Circular No. 30/2026/TT-BYT dated 9 July 2026, Guidance on the content and presentation of nutritional components and nutritional values on food labels. Effective 10 July 2026. Van Ban Chinh Phu
World Health Organization. WHO Global Sodium Benchmarks for Different Food Categories, 2nd edition. 17 April 2024.
National Institute of Nutrition, Viet Nam. Dùng muối hạt thay muối iod: Thói quen tưởng lành mạnh nhưng chưa chắc phù hợp [Replacing iodized salt with natural salt: a seemingly healthy habit that may not be appropriate]. 13 May 2026. Viện Dinh Dưỡng Quốc Gia
World Health Organization. Use of Lower-Sodium Salt Substitutes: WHO Guideline. 27 January 2025. World Health Organization
World Health Organization. SHAKE the Salt Habit, 2nd edition. 12 May 2026. World Health Organization
National Institute of Nutrition, Viet Nam / Ministry of Health. Ten Recommendations for Proper Nutrition toward 2030, issued together with Decision No. 3594/QĐ-BYT dated 29 November 2024.
National Institute of Nutrition, Viet Nam. Những điểm cập nhật về nhu cầu dinh dưỡng khuyến nghị cho người Việt Nam [Updates to the Recommended Nutrient Intakes for Vietnamese People]. 3 August 2026.
National Institute of Nutrition, Viet Nam. Thói quen xì xụp uống hết bát nước phở có gây hại cho sức khỏe? [Does drinking all the broth in a bowl of phở affect health?]. 7 September 2026. Viện Dinh Dưỡng Quốc Gia
Wallace TC, Cowan AE, Bailey RL. Application of Umami Tastants for Sodium Reduction in Food: An Evidence Analysis Center Scoping Review. Journal of the Academy of Nutrition and Dietetics. 2023;123:809–824. Evidence reviewed included partial substitution of sodium chloride with umami tastants such as MSG; the authors also noted the need for further prospective research on total dietary sodium and clinical outcomes. PubMed
Disclaimer
This article is intended for general educational and informational purposes only. It discusses population-level evidence, public-health guidance and practical approaches to reducing dietary sodium. It does not provide individualized medical, nutrition, legal or other professional advice and does not replace appropriate assessment, diagnosis, treatment, medical nutrition therapy or individualized nutrition care by suitably qualified and, where required, appropriately authorized professionals.
Individual sodium, fluid and potassium needs can differ according to age, health status, physical activity, environmental conditions, medication use and other factors. People with hypertension, kidney disease, heart failure or other conditions affecting sodium, fluid or potassium balance may require individualized advice.
Potassium-containing lower-sodium salt substitutes are not suitable for everyone. WHO’s current recommendation applies to adults in the general population who choose to use table salt and excludes people with impaired kidney function or other conditions or circumstances that may compromise potassium excretion. It does not apply to children or pregnant women. If a household member is at risk of hyperkalaemia, such a substitute should not be used in a shared meal that the person will eat.
Reducing sodium should not be interpreted as a reason to disregard iodine nutrition. Where salt is used, iodized salt remains relevant to preventing iodine deficiency, while the total amount of salt consumed should still be kept within appropriate limits.
Scientific evidence, nutrition recommendations and regulatory requirements may change over time. Culinary Medicine Vietnam aims to review and update this resource as relevant evidence, national guidance and regulatory developments evolve.