Addison's Disease Diet: How Much Salt Do You Need?

There is no strict or specialized “Addison’s diet.” The most critical part of managing Addison’s disease (also known as primary adrenal insufficiency) is consistently taking your prescribed hormone replacement medications ^[1]. Aside from eating a generally balanced and nutritious diet, the main dietary consideration involves managing your salt (sodium) intake, as your body may lose more salt than the average person ^[2].

Note: This information applies specifically to primary adrenal insufficiency. People with secondary adrenal insufficiency usually retain the ability to balance sodium and may receive different dietary advice.

Why Salt Matters

In a healthy body, the adrenal glands produce hormones called aldosterone and cortisol. Aldosterone signals the kidneys to hold onto sodium and release potassium ^[2]. In Addison’s disease, the lack of aldosterone causes the kidneys to excrete too much sodium in the urine while holding onto excess potassium ^[2]. Additionally, the lack of cortisol makes it harder for the body to manage water balance ^[2].

Together, these hormone deficiencies can lead to low blood volume, low blood pressure, and a dangerous drop in blood sodium levels (hyponatremia) ^[2]. To replace the missing aldosterone, endocrinologists prescribe a daily mineralocorticoid (a medication that balances salt and water) called fludrocortisone ^[1].

Listening to Salt Cravings and Medication Balance

Even while taking fludrocortisone, you might experience intense cravings for salty foods, which is your body’s natural physiological response to losing excess sodium ^[2].

Persistent salt cravings can be a clue that your fludrocortisone dose is too low (under-replacement) ^[3]. This is especially true if the cravings are accompanied by postural dizziness (feeling lightheaded when you stand up), fatigue, or low blood pressure ^[3].

However, salt cravings alone do not prove your dose is inadequate, and you should never change your fludrocortisone dose or dramatically increase your daily salt intake on your own ^[4]. Too much fludrocortisone or excess dietary salt (over-replacement) can cause harmful side effects, including high blood pressure, fluid retention (swelling in your hands or feet), headaches, and dangerously low potassium ^[3].

Instead, discuss persistent cravings with your endocrinologist. They will determine if your medication needs adjusting by evaluating your blood pressure, symptoms, and blood tests, which include sodium, potassium, and renin (an enzyme released by the kidneys that helps doctors judge if your mineralocorticoid dose is adequate) ^{[5] [3]}.

Hot Weather and Exercise

When you sweat, your body naturally loses sodium. For someone with Addison’s disease, heavy sweating from hot weather, endurance exercise, or intense physical labor can quickly deplete your body’s sodium stores.

While you may need extra salt and fluids during these times, there is no universal salt recipe or standard electrolyte drink recommended for everyone ^[6]. Increasing salt and fluids without medical guidance can be dangerous, particularly if you have high blood pressure, heart disease, or kidney conditions ^[6]. Work with your doctor to create a personalized, safe plan for adjusting your sodium and fluid intake when you anticipate heavy sweating ^[6].

Illness and Vomiting: When to Get Urgent Help

It is vital to distinguish between a healthy need for extra dietary salt (such as during a summer hike) and a life-threatening medical emergency known as an adrenal crisis.

If you are sick with vomiting or diarrhea, you are losing significant fluids and electrolytes. Do not try to manage stomach illnesses by simply eating extra salt or drinking salty fluids. Gastrointestinal illness is a major trigger for an adrenal crisis ^[1].

You must follow your prescribed “sick-day” plan ^[1]:

• Mild illness (able to absorb oral medication): Follow your doctor’s instructions for doubling or tripling your oral hydrocortisone ^[1].
• Severe illness (unable to absorb oral medication): If you experience repeated vomiting, cannot keep pills down, or develop severe weakness, confusion, or collapse, use your emergency hydrocortisone injection immediately ^{[1] [7]}.
• Seek emergency medical care: After injecting your emergency hydrocortisone, go to the emergency room or call emergency services immediately for intravenous (IV) fluids and further steroid treatment ^{[1] [7]}.

Always keep your emergency hydrocortisone kit unexpired and accessible, ensure your family knows how to use it, and carry medical alert identification ^[7].