As part of her diet, Vanessa Mitera cooks up something she calls "fat bombs."
In five months, Mitera has dropped 12 pounds and her husband has dropped 25.
The keto diet calls for getting 70 or 80 percent of your total calories from fat and eating fewer than 50 grams of carb, the equivalent of two bananas, a day.
Ketosis occurs when the body has used up all your body's glucose stores and your body begins metabolizing fat for energy.
But how does a keto dieter know they are burning fat? The answer is in their urine.
"Most people don't know we test our pee periodically," Mitera said.
Ketosis, however, is not for everyone. Registered dietitian Tracy Jackson says while keto helps quick weight loss, it can cause problem in the long term.
"It worries me particularly about type one diabetics, but it kind of worries me about anybody with a health concern," she said. "Your body has developed this way for fuel basically for survival, I mean if you are going through a famine, a hunger strike, your body can shift to this type of fuel, the ketones for fuel. But it doesn't impart any superior benefits."