My cousin was on an extreme diet for weight loss and developed ketosis. Of course, she didn't know what it was or that it had occurred. She had been losing a lot of weight but noticed a change in her scent. She developed a bad odor, breath that smelled like alcohol and very dark, foul smelling urine. She was also dizzy often, probably because of low blood sugar.
She went to the hospital and they ran a blood test to check for ketones. The ketones were extremely high in number and she was given treatment right away. She had to stop her extreme diet and start a healthy diet with enough carbohydrates. She's still losing weight, just more slowly. She doesn't want to go into ketosis again so she doesn't mind that reaching her target weight will take a little bit longer.