While excessive salt intake is known to be harmful, insufficient salt can also have negative effects.
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Evidence suggests that a low-salt diet may lead to low blood pressure, dehydration, low sodium levels, and elevated blood fat levels.
Low Blood Pressure (Hypotension)
For individuals with normally stable blood pressure, a low-salt diet can sometimes cause hypotension, characterized by blood pressure that is lower than normal.
Symptoms of hypotension can include dizziness, nausea, fainting, blurred vision, depression, and dehydration.
This risk is heightened for those with a history of heart failure, as treatment often aims to lower blood pressure significantly.
Regular blood pressure monitoring is advisable for those affected.
Dehydration
Sodium is crucial for regulating fluid balance in the body, and a low-salt diet may lead to dehydration.
Dehydration occurs when there is an inadequate amount of fluid in the body, with signs including dry skin, a dry mouth, and increased thirst. Severe dehydration can result in hospitalization or even death.
Older adults and individuals with malnutrition are particularly vulnerable and should monitor their fluid intake closely.
Low Blood Sodium Levels (Hyponatremia)
A diet low in salt can result in hyponatremia, a condition where blood sodium levels drop below normal.
Symptoms of hyponatremia can include neurological issues such as confusion, seizures, and in severe cases, coma.
Gastrointestinal symptoms like loss of appetite, vomiting, and nausea may also occur. Older adults are especially at risk and should seek medical advice if they experience these symptoms.
Elevated Cholesterol and Triglycerides
Restricting salt intake has been associated with increased levels of LDL (bad) cholesterol and triglycerides.
A 2016 study involving 12,210 adults found that reducing dietary salt led to a 2.9% increase in cholesterol and a 6.3% rise in triglycerides, regardless of whether participants had hypertension.
Elevated LDL cholesterol and triglycerides are known risk factors for heart disease.
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