Yes. Ketones are a breakdown product of fats and an indicator that your body isn't get the glucose it needs to function at it's best. Ketones cause your body to go into starvation mode and conserve calories. They can also make you feel nauseated and lethargic. Ketones can also be a marker of diabetes.
May be dehydrated. Too much ketones in the urine can be a sign that you are dehydrated or not eating enough carbs.