A nurse friend has spoken to me worried that my breath has smelled of peardrops for over a week (more or less the length of time I’ve been on BSD 800. Should I be worried? I guess it’s ketosis but is it normal in this diet? Or, should I up my carbs?

Low insulin can produce this ketones in the breath and a serious risk in some people is ketoacidosis that should not be ignored. I am not qualified to comment on your case. There was a warning of this in a thread last week. I would seek some medical opinion before very long just to reassure yourself and ensure you are not putting yourself at risk.

Here’s some info on the difference between ketosis and ketoacidosis: http://www.ketogenic-diet-resource.com/ketoacidosis.html