How many calories are in a splash of half-and-half?

About 20 per tablespoon. A pour straight from the carton is often closer to two tablespoons, around 40 calories.

Does half-and-half break ketosis?

No. A tablespoon has well under 1 g of carbohydrate, too little to affect ketosis.

Is half-and-half better than creamer while fasting?

It has no added sugar or oils, so its insulin effect is smaller than sweetened creamer's. Both still break a strict fast.

Is heavy cream or half-and-half better for fasting?

Half-and-half has fewer calories, about 20 per tablespoon against 50 for heavy cream. Heavy cream has less milk sugar, so it edges ahead for ketosis.

Does Half-and-Half Break a Fast? It Depends

Reviewed by the FastTrack team · Updated June 2026

Short answer: It depends

Half-and-half breaks a strict fast, though a splash matters little for weight loss. One tablespoon has about 20 calories, with 1.7 g of fat and under 1 g each of milk sugar and protein. Two or three splashes add up, and any amount ends a clean or autophagy fast.

Calories	~20 kcal per tbsp
Breaks a weight-loss fast?	Partial
Breaks ketosis?	No
Breaks autophagy?	Yes
Insulin impact	Low

Why half-and-half is a grey area

Half-and-half is a mix of whole milk and cream, around 11% fat. Per tablespoon that is about 20 calories, 0.6 g of carbohydrate from lactose and 0.4 g of protein. The sugar and protein are small, so one splash brings only a modest insulin response, yet its calories still break a fast defined by calories or done for autophagy.

Heavy cream, creamer and fat-free versions

Compared with heavy cream, half-and-half has fewer calories per tablespoon and a little more milk sugar. Compared with flavored creamer, it has no added sugar or oils. Fat-free half-and-half is a different product: skim milk thickened with corn syrup, with about 25 calories and 2 g of sugar per 2 tablespoons. It trades a few calories for more sugar, so it is no better choice for a fast.

How much is safe

On a weight-loss fast, keep it to one tablespoon in a single cup of coffee. For a clean or autophagy fast, drink coffee black and save half-and-half for your eating window.

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Frequently asked questions

How many calories are in a splash of half-and-half?: About 20 per tablespoon. A pour straight from the carton is often closer to two tablespoons, around 40 calories.
Does half-and-half break ketosis?: No. A tablespoon has well under 1 g of carbohydrate, too little to affect ketosis.
Is half-and-half better than creamer while fasting?: It has no added sugar or oils, so its insulin effect is smaller than sweetened creamer's. Both still break a strict fast.
Is heavy cream or half-and-half better for fasting?: Half-and-half has fewer calories, about 20 per tablespoon against 50 for heavy cream. Heavy cream has less milk sugar, so it edges ahead for ketosis.