Does Liquid I.V. Sugar-Free break a fast?

For weight loss and ketosis, no. It has 0 g of sugar, and its allulose barely moves blood sugar. On a strict water fast, skip it.

How many calories are in Liquid I.V.?

The classic Hydration Multiplier lists about 45 calories and 11 g of sugar per stick. The Sugar-Free sticks list about 15 to 20 calories.

Is Liquid I.V. or LMNT better while fasting?

Sugar-Free Liquid I.V. has about half the sodium of LMNT, roughly 500 mg against 1,000 mg. Both work; LMNT suits people who need more salt on long fasts.

Can I drink Liquid I.V. to break my fast?

The classic version is a reasonable drink after a long fast or a workout, followed by a real meal with protein.

Does Liquid I.V. Break a Fast? It Depends

Reviewed by the FastTrack team · Updated June 2026

Short answer: It depends

It depends on which Liquid I.V. you use. The classic Hydration Multiplier has 11 g of sugar and about 45 calories per stick, enough to break a fast. The Sugar-Free sticks have 0 g of sugar and about 15 to 20 calories from allulose, which most people can use while fasting.

Calories	~45 kcal (classic), ~15-20 kcal (sugar-free)
Breaks a weight-loss fast?	Partial
Breaks ketosis?	Partial
Breaks autophagy?	Partial
Insulin impact	Raised by the classic, minimal for sugar-free

Why the classic stick breaks a fast

Liquid I.V. uses sugar to pull sodium and water from the gut into the body faster, the same idea as oral rehydration solutions. That works for rehydration, but 11 g of cane sugar and dextrose raises blood sugar and insulin and ends the fasted state, so the classic stick belongs in your eating window.

The sugar-free version

Liquid I.V. Sugar-Free replaces the sugar with allulose and stevia. Allulose mostly passes through the body without being used for energy and has a negligible effect on blood sugar and insulin, so the 15 to 20 calories on the label matter little for weight loss or ketosis. On a strict fast for autophagy, plain water with a pinch of salt is the cleaner choice.

How much is safe

One sugar-free stick in 16 oz of water during the fast is enough for most people. Keep the classic sticks for after a workout or for your eating window.

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Frequently asked questions

Does Liquid I.V. Sugar-Free break a fast?: For weight loss and ketosis, no. It has 0 g of sugar, and its allulose barely moves blood sugar. On a strict water fast, skip it.
How many calories are in Liquid I.V.?: The classic Hydration Multiplier lists about 45 calories and 11 g of sugar per stick. The Sugar-Free sticks list about 15 to 20 calories.
Is Liquid I.V. or LMNT better while fasting?: Sugar-Free Liquid I.V. has about half the sodium of LMNT, roughly 500 mg against 1,000 mg. Both work; LMNT suits people who need more salt on long fasts.
Can I drink Liquid I.V. to break my fast?: The classic version is a reasonable drink after a long fast or a workout, followed by a real meal with protein.