"I like certainty that I'm sticking to dietary choices, but with keto it's always a bit annoying," Hickey said. "We live in a society — I'm not going to bring a urinalysis test strip to the office.

You can test whether you’re in ketosis and burning fat at a higher rate with at-home test strips. But there can also be some other, sometimes unpleasant, signs and symptoms of ketosis.