Sweeteners are an option, and they are certainly healthier than sugar. However, studies on artificial sweeteners are not conclusive and systematic reviews suggest they may have an adverse effect on the gut microbiota. So-called natural sweeteners such as erythritol, monk fruit, and stevia appear to have a healthier profile. But it is a stretch to say that any sweetener is “healthy.” If you wish to use sweeteners, it’s unlikely to be a problem, but in my personal view it shouldn’t be an everyday thing.