Sodium: How to tame your salt habit
Find out how much sodium you really need, what high-sodium foods to avoid, and ways to prepare and serve foods without adding sodium.
By Mayo Clinic Staff
If you're like many people, you're getting far more sodium than is recommended, and that could lead to serious health problems.
You probably aren't even aware of just how much sodium is in your diet. Consider that a single teaspoon of table salt, which is a combination of sodium and chloride, has 2,325 milligrams (mg) of sodium – more than the daily amount recommended in the Dietary Approaches to Stop Hypertension (DASH) diet.
And it's not just table salt you have to worry about. Many processed and prepared foods contain sodium.
See how sodium sneaks into your diet and ways you can shake the habit.
Sodium: Essential in small amounts
Your body needs some sodium to function properly because it:
- Helps maintain the right balance of fluids in your body
- Helps transmit nerve impulses
- Influences the contraction and relaxation of muscles
Your kidneys naturally balance the amount of sodium stored in your body for optimal health. When your body sodium is low, your kidneys essentially hold on to the sodium. When body sodium is high, your kidneys excrete the excess in urine.
But if for some reason your kidneys can't eliminate enough sodium, the sodium starts to build up in your blood. Because sodium attracts and holds water, your blood volume increases, which makes your heart work harder and increases pressure in your arteries. Such diseases as congestive heart failure, cirrhosis and chronic kidney disease can make it hard for your kidneys to keep sodium levels balanced.
Some people's bodies are more sensitive to the effects of sodium than are others. If you're sodium sensitive, you retain sodium more easily, leading to fluid retention and increased blood pressure. If this becomes chronic, it can lead to heart disease, stroke, kidney disease and congestive heart failure.
Sodium: How much do you need?
The Dietary Guidelines for Americans recommends limiting sodium to less than 2,300 mg a day.
Keep in mind that these are upper limits, and less is usually best, especially if you're sensitive to the effects of sodium. If you aren't sure how much sodium your diet should include, talk to your doctor or dietitian.
Sodium: What are the major dietary sources?
The average American gets about 3,400 mg of sodium a day — much more than recommended. Here are the main sources of sodium in a typical diet:
April 16, 2016
- Processed and prepared foods. The vast majority of sodium in the typical American diet comes from foods that are processed and prepared. These foods are typically high in salt and additives that contain sodium. Processed foods include bread, pizza, cold cuts and bacon, cheese, soups, fast foods, and prepared dinners, such as pasta, meat and egg dishes.
- Natural sources. Some foods naturally contain sodium. These include all vegetables and dairy products, meat, and shellfish. While they don't have an abundance of sodium, eating these foods does add to your overall body sodium content. For example, 1 cup (237 milliliters) of low-fat milk has about 100 mg of sodium.
- In the kitchen and at the table. Many recipes call for salt, and many people also salt their food at the table. Condiments also may contain sodium. One tablespoon (15 milliliters) of soy sauce, for example, has about 1,000 mg of sodium.
See more In-depth
- In brief: Your guide to lowering your blood pressure with DASH. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/resources/heart/hbp-dash-in-brief-html. Accessed March 7, 2016.
- Hypertension. First consult. https://www.clinicalkey.com. Accessed March 7, 2016.
- Sheps SG, ed. Mayo Clinic: 5 Steps to Controlling High Blood Pressure. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2015.
- Get the facts: Sodium and the dietary guidelines. Centers for Disease Control and Prevention. http://www.cdc.gov/salt/pdfs/sodium_dietary_guidelines.pdf. Accessed March 10, 2016.
- Kaplan NM. Salt intake, salt restriction, and primary (essential) hypertension. http://www.uptodate.com/home. Accessed March 7, 2016.
- Executive summary: Dietary Guidelines for Americans, 2015-2020. U.S. Department of Health and Human Services. http://health.gov/dietaryguidelines/2015/guidelines/executive-summary/. Accessed March 7, 2016.
- Sodium and food sources. Centers for Disease Control and Prevention. http://www.cdc.gov/salt/food.htm. Accessed March 7, 2016.
- Top 10 sources of sodium. Centers for Disease Control and Prevention. http://www.cdc.gov/salt/sources.htm. Accessed March 7, 2016.
- Sodium in your diet: Use the Nutrition Facts label and reduce your intake. U.S. Food and Drug Administration. http://www.fda.gov/Food/ResourcesForYou/Consumers/ucm315393.htm. Accessed March 7, 2016.
- Your guide to lowering blood pressure with DASH. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/public/heart/hbp/dash/index.htm. Accessed March 7, 2016.
- USDA National Nutrient Database for Standard Reference, Release 28. U.S. Department of Agriculture, Agricultural Research Service. http://ndb.nal.usda.gov. Accessed March 7, 2016.
- Reducing sodium in a salty world. American Heart Association. http://www.heart.org/HEARTORG/HealthyLiving/HealthyEating/HealthyDi...ducing-Sodium-in-a-Salty-World_UCM_457519_Article.jsp#.VuD81cfAju8. Accessed March 10, 2016.
- Sodium: Tips for people with chronic kidney disease (CKD). National Kidney Disease Education Program. http://www.niddk.nih.gov/health-information/health-communication-programs/nkdep/a-z/nutrition-sodium/Pages/nutrition-sodium.aspx. Accessed March 10, 2016.
- Shaking the salt habit. American Heart Association. http://www.heart.org/HEARTORG/Conditions/HighBloodPressure/Preventi...ressure/Shaking-the-Salt-Habit_UCM_303241_Article.jsp#.VuD_dsfAju8. Accessed March 10, 2016.
- Zeratsky KA (expert opinion). Mayo Clinic, Rochester, Minn. March 11, 2016.