Salt-Restricted Diet Definition
A salt-restricted diet means limiting daily sodium chloride (table salt) intake to less than 5 grams per day (approximately 2 grams of sodium), which equals roughly one teaspoon of salt. 1
Specific Quantitative Targets
The most recent global and regional hypertension guidelines converge on the following targets:
- Standard recommendation: <5 g/day of salt (≈2 g/day sodium) 1
- More aggressive targets: 1.5-2.4 g/day sodium (3.8-6 g/day salt) for certain populations 1, 2
- WHO global standard: <5 g/day salt 1
The 2023 ESH guidelines specifically define salt restriction as <5 g/day (approximately 2 g sodium/day) for improved blood pressure control. 1
Practical Understanding
What This Means in Real Terms
By weight, salt is 40% sodium and 60% chloride. Therefore:
- 1 teaspoon of table salt = approximately 2,300 mg sodium 2
- Target of <5 g salt = <2,000 mg sodium
- This represents a significant reduction from typical intake (8-12 g/day in most populations) 3
Where Sodium Comes From
Understanding the sources is critical for effective restriction:
- 75-80% from processed/manufactured foods - added during processing for flavor, preservation, and functional properties 2
- 10% naturally occurring in foods 2
- 5-10% from salt added during cooking or at the table 2
This distribution means you cannot achieve adequate salt restriction simply by removing the salt shaker from the table - the primary intervention must target processed and packaged foods.
How to Implement Salt Restriction
Dietary Modifications
Replace processed foods with fresh alternatives:
- Choose fresh, frozen, or canned vegetables without added salt 4
- Avoid high-salt foods: soy sauce, fast foods, processed foods, breads and cereals high in salt 1
- Read nutrition labels: select foods with <140 mg sodium or <5-10% daily value 2
Cooking and preparation strategies:
- Use fresh herbs and spices instead of salt for flavoring 2
- Remove salt from cooking entirely 2
- Grill, bake, or broil rather than using high-sodium preparation methods 4
Important Caveats
Salt substitutes require caution:
- Potassium chloride-based salt substitutes are contraindicated in patients with chronic kidney disease, hyperkalemia, or those taking potassium-sparing diuretics 1, 2
- For appropriate patients without these contraindications, potassium-enriched salt substitutes can provide dual benefit of sodium reduction and potassium supplementation 1
Medication considerations:
- Certain medications contain significant sodium: antacids, laxatives, NSAIDs 2
- Sodium polystyrene sulfonate (Kayexalate®) contains 100 mg sodium per 100 g powder 2
Clinical Context and Gradual Implementation
Avoid abrupt, severe restriction - patients accustomed to high sodium intake may lose appetite and become malnourished if restriction is instituted too rapidly 2. Introduce sodium restriction gradually to allow taste adjustment 2.
For children with CKD and hypertension, sodium restriction should be individualized: 1-2 mmol/kg/day is reasonably consistent with age-appropriate dietary reference intakes 2.
The restriction should be maintained long-term - this is a lifestyle modification, not a temporary intervention. Studies show sustained blood pressure reduction requires ongoing adherence 5, 6.