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Salt, potassium and blood pressure

Most of the sodium in an Indian diet is not in the salt shaker.

Reducing sodium lowers blood pressure, but most dietary sodium comes from pickles, papad, packaged snacks and restaurant food rather than from added salt. Raising potassium is the other half: potassium helps the kidney excrete sodium, and Indian intakes are typically well below requirement.

Where the sodium actually is

Removing the salt shaker from the table addresses a modest fraction of intake. The larger contributors are preserved and prepared foods, and they are easy to overlook because they do not taste proportionately salty.

  • Pickles, papad and chutneys eaten daily
  • Packaged namkeen, biscuits and bread — including savoury items that taste sweet
  • Restaurant and delivery food, which is consistently high
  • Instant noodles, soups and seasoning cubes
  • Processed cheese, sauces and ready masalas

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The potassium half

Sodium and potassium work against each other in the kidney. Potassium promotes sodium excretion, which is why raising it lowers blood pressure through a different route from cutting salt.

Most dietary guidance in India emphasises the first and is silent on the second, although the typical intake gap is larger on the potassium side.

  • Banana, papaya, orange and pomegranate
  • Potato and sweet potato, particularly with the skin
  • Rajma, chana and other pulses
  • Palak, methi and other greens
  • Coconut water and curd

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What else moves blood pressure

Diet is one of several levers and not always the largest one for a given person.

Weight, and particularly waist circumference, matters considerably. Sleep matters, and untreated sleep apnoea is a common and much-missed cause of resistant hypertension. Alcohol raises blood pressure in a dose-related way. Regular aerobic activity lowers it. Chronic stress contributes through a real physiological route, not only a behavioural one.

The line we will not cross

Nothing here is a reason to alter blood pressure medication. Blood pressure is treated to prevent stroke and heart disease, and the consequences of stopping treatment are not gradual.

If your readings improve, that is a conversation to have with the doctor who prescribed the medicine, and it is their decision to make. We will support the dietary side of the work and we will not comment on the prescription.

In short

Most dietary sodium comes from preserved and packaged food, not the salt shaker.
Raising potassium lowers blood pressure through a separate mechanism from cutting sodium.
Never change blood pressure medication on dietary grounds — that is your doctor’s decision.

Questions we are asked

Is rock salt or sendha namak better than table salt?

Not meaningfully for blood pressure. The sodium content is broadly similar. Iodised salt, however, matters for thyroid function, and switching away from it entirely is not a good trade.

How much salt is reasonable?

The World Health Organization recommends under 5 g of salt a day for adults. Typical Indian intake is considerably above that, largely from the sources listed here.

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Conditions this relates to

Blood pressure Migraine

Recipes that put this into practice

Related reading

References

  1. World Health Organization — guideline on sodium intake for adults and children.
  2. Indian Council of Medical Research — dietary guidelines for Indians.
  3. [Further references to be completed by the medical review panel.]

This article is general health information, written by a clinical nutritionist and reviewed by a doctor. It is not a diagnosis and it does not replace advice from your own clinician. Never change prescribed medication on the basis of what you read here.

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