We designed our Everyday Hydration Salts to be fast-friendly! With less than 0.5g of carbs and under 3 calories per serve, our Everyday Hydration Salts fall well under the general rule of under 50 calories will not break a fast. Whilst we’ve had many customers verify this with a CGM, everyone is different and it’s best to verify this yourself to test your personal response to different foods and drinks.