Salt for Fasting: Why It Matters and How to Use It

During fasting, most people focus most on what or when not to eat, but not so much on understanding what the body still needs during a fast. 

Food provides energy and nutrients, in addition to electrolytes like sodium, which are necessary for fluid balance in the body. Outside fasting windows, food sources of electrolytes may help support hydration and overall balance.

When you fast, particularly for longer periods of 24 hours or more, headaches, fatigue, and dizziness can be the usual side effects. Some of these may be related to inadequate fluid and/or salt intake.

Let’s dive in and learn how salt works during fasting, how much to take, and answer the most common questions people ask.

What Is a Good Salt for Fasting?

What makes a good salt for fasting is the first thing you need to understand, as not all salts are the same. Sodium chloride is the primary component in all salts, and that’s what’s needed for fluid and electrolyte balance, so any type of salt will work. However, some varieties contain trace minerals that some people believe may provide some small additional benefits during fasting.

What Are the Best Salts? 

1. Himalayan Pink Salt

Harvested from ancient sea beds in the Himalayan mountains, this salt has trace amounts of minerals, including potassium, magnesium, and calcium. This is a common choice among fasters who prefer pure salt with minimal processing (1).

2. Celtic Sea Salt (Grey Sea Salt)

This is another type of unrefined sea salt that retains moisture and contains small amounts of trace minerals. It’s less processed than typical table salt and often favored for electrolyte support (2).

3. Unrefined Sea Salt

High-quality, unrefined sea salt can also work well during fasting (2).

Read more: Fasting Phases: What Your Body’s Really Doing When You Skip a Meal

What Salts Should You Avoid?

It’s best to avoid salt blends containing sugar or flavorings, which may contain calories that might affect your fast. Some table salts contain anti-caking agents, which some people prefer to avoid, but they’re not harmful in small amounts and won’t affect your fasting state. One positive for table salt is that it often contains added iodine, an essential mineral for thyroid health that isn’t found in most specialty salts such as those listed above.

Should I Eat Salt When Fasting?

For many adults, small amounts of salt may be part of their fasting routine, depending on the length of the fast and individual circumstances. 

However, this may not be appropriate for everyone. People with high blood pressure, kidney disease, heart conditions, or those who are taking medications that affect fluid balance (such as diuretics) should consult a healthcare professional before they increase their sodium intake during fasting or in general. 

Too much salt may also leave some people feeling bloated, puffy, or unusually thirsty, which is why balance and hydration are important during fasting.

This article is intended for informational purposes. If you have any underlying health conditions or have any questions, you should consult your doctor.

Why Should I Add Salt When Fasting?

This is related to the fasting window duration. For shorter intermittent fasting routines, such as 16:8 or 18:6, many people continue getting sodium through their regular meals. During the fasting window, some choose to add a small pinch of salt to water or use electrolyte-based fasting drinks, while others prefer plain water and feel comfortable with that approach. Preferences can vary depending on the individual and the fasting routine.

However, for longer fasts, such as 24 to 72 hours or more, salt becomes more important. During extended fasting, insulin levels drop, which may signal the kidneys to release sodium. 

This may naturally lead to increased urination and fluid loss, particularly in the first few days of fasting, potentially leading to side effects (3, 4).

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How Much Salt Do You Need per Day When Fasting?

The amount depends on your fasting duration, body size, activity level, and climate.

A general guide can be:

• 16-18 hour fasts: usually 0-1 g of added sodium (a small pinch of salt if needed)
• 24-hour fasts: about 1-2 g of sodium (≈ 2.5-5 g or ½ to 1 tsp of salt) throughout the day
• 48-72 hour fasts: about 2 g of sodium (≈ 5 g or 1 tsp salt) per day, split across several servings

It’s also important not to overdo it. Too much salt at once can cause nausea or stomach discomfort, particularly on an empty stomach. Start with a small amount and adjust based on how you feel.

What Some People Notice During Fasting

• Headaches
• Muscle tightness or cramps
• Lightheadedness
• Tiredness
• Trouble focusing

What Some People Notice When Salt Intake Feels Too High

• Temporary puffiness
• Excessive thirst
• Stomach discomfort

Finally, you mustn’t neglect hydration, as this matters just as much as sodium. Drink plenty of water alongside salt, as sodium works with fluids to maintain proper electrolyte balance during fasting (5, 6).

Read more: Fasted Cardio Benefits: What You Should Know

What Is the Salt Trick in Intermittent Fasting?

The “salt trick” usually refers to taking a small amount of salt during a fast, a practice some people loosely associate with a salt water detox, as they say it helps them feel better.

How Does It Work?

Some people report feeling more comfortable after having a small amount of salt and water during a fast, particularly during longer fasting periods.

How to Do It

1. Place a small pinch (approximately 1/8 teaspoon) of salt on your tongue and drink water afterward.
2. Or add the same amount of salt to a glass of water, dissolve, and sip slowly.

Many people report feeling better within 10-15 minutes. This trick doesn’t break a fast as salt contains no calories or other nutrients other than sodium and chloride.

Frequently Asked Questions

• Does salt break ketosis?

No. Salt has zero calories and therefore no fats, carbs, or protein. It doesn’t prompt insulin release and doesn’t affect fat burning or ketosis. The only exception is salt or electrolyte blends that contain added sugar.

• What is the difference between fasting salt and regular salt?

There’s no officially regulated product called “fasting salt”. The term may refer to less refined salts compared to table salt, such as Himalayan, Celtic, or sea salt. Some people prefer these, but regular old table salt works just as well for the purpose of electrolyte replacement.

• Does salt count as carbs?

No. Salt is a mineral that is composed of sodium and chloride. It contains no carbohydrates, sugar, or calories. It doesn’t impact blood glucose levels.

• Do I need electrolytes when fasting?

Yes, electrolytes, especially sodium, in addition to potassium and magnesium, are important during longer fasting periods as they support muscle function and nerve signaling. For shorter, intermittent fasts, you may still get enough electrolytes during your feeding windows and not need to supplement.

• How much salt should be put in water for electrolytes?

One approach some people use is to add ¼ to ½ teaspoon of salt per liter (32 oz) of water and sip it gradually, although preferences and needs can vary. 

The Bottom Line

Salt is often the most overlooked aspect of successful fasting. During longer fasts, shifts in fluid and electrolyte balance may affect how some people feel, which is why salt is often discussed in fasting routines.

Choosing a quality salt and listening to your body can make the difference between a miserable fast and a sustainable one.

Remember that fasting isn’t just about removing food, it’s about supporting your body intelligently while you do it.