Does sugar-free coffee creamer break a fast?

Sugar-free is not the same as calorie-free. Liquid sugar-free coffee creamers have about 15 to 20 kcal per tablespoon (15 ml), and the calories come from fat. A single-serve 11 ml tub of liquid creamer has about 15 kcal. One sugar-free powder creamer has about 15 kcal per 2 g teaspoon.

This site sorts answers by four goals. For weight loss, one tablespoon of sugar-free creamer is a grey area. It is under the common 50-calorie rule of thumb, which is not an official limit. For autophagy it breaks a fast, because the strictest goal counts anything with calories. It breaks a gut-rest fast too, since fat has to be digested. Blood sugar is grey. The creamer has almost no sugar, but the flavours are sweet ones such as hazelnut and French vanilla. Whether sweeteners raise insulin is unresolved and may vary between people.

The number of pours decides the weight-loss answer. As a worked example, 2 tablespoons in each of three morning coffees is 6 tablespoons, or about 90 to 120 kcal. That is well past the 50-calorie rule of thumb, so the fast is broken for weight loss as well. One measured tablespoon in one coffee keeps the total at about 15 to 20 kcal.

Fat-free, keto and zero-calorie creamers all need the same label check. Read the calories and the serving size, since one brand lists a teaspoon and another a tablespoon. Under US rules, a creamer labelled calorie free can still have up to 5 kcal per serving. If you fast for autophagy or gut rest, drink your coffee black until your eating window opens.