Ketones are generated as a by product of fat burning. Generally, it is about burning body fat, but it can be about burning dietary fat. The gallbladder is for storage of bile. You still produce bile, but you won’t have a wicked glob of bile to deal with a big chunk of dietary fat. But that is ok. You don’t have a phase 1 insulin response either. You can still eat and digest fat, but not much at any one time. What has likely happened is that you may not have been eating consistently. If you fast, your body may well just burn fat as Joe notes and that can generate ketones. If your blood sugars have been as you suggest mid 100s and occaisonal excursions to mid 200s you are not likely generating them from DKA. Try to return to a consistent diet and I suspect the ketones will just dissappear. In general the reagents on old strips will fail to respond rather than giving a false positive reading. As such, as Marie suggests, if you do have ketone readings and your strips are old, it would be prudent to replace them. It is always good to protect yourself. I mean it is possible that you have high ketones and your meter is actually off, bad strip vial or bad coding. Stuff happens.