Jennifer Aniston Says She’s on the 16:8 Intermittent FastingDiet—But What Is That? Aniston revealed that she’s a big fan of intermittent fasting, a version called the 16:8 diet Aniston’s preferred way of intermittent fasting limits her eating time window to eight hours per day As far as the benefits of intermittent fasting go, one study found that it helped people lose weight Some advocates of the 16:8 diet claim it helps control blood sugar levels and boost brain function Aniston likes to start her day with a celery juice around 9 a.m., which some fasting purists might not agree with Typically, intermittent fasting permits nothing but water, tea, or coffee for the entire 16-hour fasting period Intermittent fasting shouldn’t come with any bad side effects, but you should not let it control your life