The Doctors check in with our Fast Burn Challenge participants and we answer their weight loss questions, including what you should (and should not) be drinking when you are trying to drop the pounds.

The 9-week weight loss challenge uses intermittent fasting, time-restricted feeding, and exercise to help people lose weight.

Get all the details on The Fast Burn Challenge, HERE!

Our Fast Burn Challenge superstar participants are halfway through the challenge -- are already seeing great results -- but they have important weight loss questions that you might be asking as well.

- Is there an optimal protein shake when trying to lose weight?

Dr. Ian Smith says to drink one that is low in calories and sugar.

- How much coffee should you be drinking?

Dr. Ian says having multiple cups of coffee will small amounts of cream and sugar is okay, but to avoid drinks like iced blended coffees with syrups and whipped creams and coffee-based drinks that are more like a dessert.

- Will carbonated water affect someone's weight loss efforts?

No, carbonated water that does not contain calories is fine to drink and Dr. Ian notes carbonation will not lead to weight gain.

- Are drinks with artificial sweeteners acceptable?

No, Dr. Ian says to avoid anything with artificial sweeteners or synthetic ingredients. 

Find out how much weight our Fast Burn Challenge participants have lost after just 4 weeks! The Doctors look forward to seeing our superstars continue to make progress and reach their weight loss goals.

Watch: Weight Loss Question Answered on The Doctors’ 'Fast Burn Challenge!'

Watch: How Much Weight Have the 7 'Fast Burn Challenge' Participants Lost?