Like "Ketones are 'created' when your body burns fat for energy rather than carbohydrates. Briefly, when you don't have enough insulin in your body burns fat for energy and you spill ketones. If you eat very low carb you will spill ketones, some people on low carb diets aren't satisfied until they are. If you fast, you may spill ketones. If you are pregnant and don't eat enough, you can spill ketones. If you have LOW blood sugar you can spill ketones (opposite to when you have not enough insulin, you have too much and it's used all the glucose so burns fat). Illness and stress can cause you to spill ketones. Exercise can cause you to spill ketones. Now, spilling ketones in your urine (ketosis) is very different to ketoacidosis because ketosis doesn't cause your blood pH to drop which is the issue with DKA. Ketosis is not (well not been shown to be) dangerous, ketoacidosis is. I would buy some fresh ketostix and monitor things and pay very carful attention to the DKA symptoms like extreme tiredness, extreme thirst, constant urination, hyperventilation, nausea and pain in the upper body. If you have multiple ones of those you really need to go to a doctor. If you have any of the following, you really need to go to the ER. Vomiting, abdominal pain, symptoms of the flu, weakness and fast/normal but deep breathing like you are gasping for air."