Ketosis is what happens when you're on a (very) low carbohydrate/high(er) fat diet, and your body switches to burning fat for energy instead of carbs. It's quite natural and safe, and is
not the same as
ketoacidosis, which
is very dangerous, can happen to (mainly type 1) diabetics when they are very low on insulin and have both very high blood glucose and very high ketone levels. So as long as your levels are OK, you don't need to worry. However, if you're on insulin, you may need to adjust your dosage, so you should check about this either with low carbing type 1s here on the forum, or with your diabetes doctor or nurse.
You possibly need to use one of the low carb nutritional calculators, to check whether you're eating carbs, fat and protein in the correct proportions, and few enough calories that you will lose weight. Have a look
here, or search on Google for other versions.
Robbity