Does Gatorade Zero break ketosis?

No. It has no sugar and only a few calories, so it does not knock you out of ketosis.

Does regular Gatorade break a fast?

Yes. A 20 oz bottle of regular Gatorade has about 34 g of sugar and 140 calories, which ends a fast.

Is Gatorade Zero good for electrolytes while fasting?

It helps a little, with about 270 mg of sodium per bottle. On longer fasts you need more sodium than that.

Does Gatorade Zero spike insulin?

Studies of sucralose and acesulfame potassium show little or no insulin response in most people, though results vary between studies.

Does Gatorade Zero Break a Fast? No

Reviewed by the FastTrack team · Updated June 2026

Short answer: No

Gatorade Zero does not break a fast for most people. A 20 oz bottle has 0 g of sugar and about 5 to 10 calories, sweetened with sucralose and acesulfame potassium. Regular Gatorade, with about 34 g of sugar per bottle, does break it.

Calories	~5-10 kcal per 20 oz
Breaks a weight-loss fast?	No
Breaks ketosis?	No
Breaks autophagy?	Unlikely
Insulin impact	Minimal

Why Gatorade Zero keeps you fasted

With no sugar and only a few calories, a bottle of Gatorade Zero does not supply enough energy to end the fasted state. It also brings back some sodium, about 270 mg, and potassium, about 80 mg, which helps on long or active fasting days.

Sweeteners and appetite

Sucralose and acesulfame potassium have no calories. Studies on whether they raise insulin are mixed and mostly show small or no effects in people, but sweet drinks keep cravings alive for some. The electrolyte dose is modest: on a fast of 24 hours or more, salt or a dedicated electrolyte drink covers sodium better.

How much is safe

One bottle during the fasting window is fine. If you find yourself drinking several a day, swap some for plain water.

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Frequently asked questions

Does Gatorade Zero break ketosis?: No. It has no sugar and only a few calories, so it does not knock you out of ketosis.
Does regular Gatorade break a fast?: Yes. A 20 oz bottle of regular Gatorade has about 34 g of sugar and 140 calories, which ends a fast.
Is Gatorade Zero good for electrolytes while fasting?: It helps a little, with about 270 mg of sodium per bottle. On longer fasts you need more sodium than that.
Does Gatorade Zero spike insulin?: Studies of sucralose and acesulfame potassium show little or no insulin response in most people, though results vary between studies.