Does LMNT break autophagy?

It is unlikely, since it contains no protein or sugar. No study has tested it directly.

Is the stevia in LMNT a problem while fasting?

Stevia has no calories and barely affects insulin. Sweet taste does make some people hungrier; if that happens, switch to the unflavored stick.

When should I drink LMNT during a fast?

Morning or early afternoon works well, or when you feel a headache or lightheadedness coming on. Avoid taking several sticks close together.

Does LMNT Break a Fast? No

Reviewed by the FastTrack team · Updated June 2026

Short answer: No

LMNT does not break a fast for most goals. A stick has about 5 to 10 calories depending on the flavor, no sugar, and 1,000 mg of sodium, 200 mg of potassium and 60 mg of magnesium. The unflavored version contains no sweetener at all.

Calories	~5-10 kcal per stick
Breaks a weight-loss fast?	No
Breaks ketosis?	No
Breaks autophagy?	Unlikely
Insulin impact	Negligible

Why LMNT suits fasting

LMNT was designed for low-carb eaters: it has no sugar and only a few calories, so it does not raise insulin or knock you out of ketosis. Its large sodium dose helps with the headaches, lightheadedness and cramps many people feel in the first days of fasting, when falling insulin makes the kidneys release more sodium.

Flavors, stevia and the salt dose

Flavored sticks use stevia, which has no calories but keeps a sweet taste that can stir appetite in some people. Raw Unflavored lists only salt, magnesium malate and potassium chloride. One stick holds more than 40% of the 2,300 mg daily sodium limit, so people with high blood pressure, heart failure or kidney disease should ask their doctor before using it daily.

How much is safe

One stick a day is typical on a fast, and some people take two on long or hot days. Sip it over the morning in 16 to 32 oz of water instead of drinking it all at once.

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Frequently asked questions

Does LMNT break a fast?: Not for weight loss or ketosis. With about 5 to 10 calories and no sugar it keeps you fasted; on a strict water fast, use Raw Unflavored.
Does LMNT break autophagy?: It is unlikely, since it contains no protein or sugar. No study has tested it directly.
Is the stevia in LMNT a problem while fasting?: Stevia has no calories and barely affects insulin. Sweet taste does make some people hungrier; if that happens, switch to the unflavored stick.
When should I drink LMNT during a fast?: Morning or early afternoon works well, or when you feel a headache or lightheadedness coming on. Avoid taking several sticks close together.