What Is The Difference Between Fasting And Caloric Restriction?
Dr. Jason Fung
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Hi Jason, fantastic read, thank you. I have experienced both sides of this coin and enjoyed (and saw significant weight loss) with the 5:2 diet in the past.

With the 5:2 diet I was allowed 500–600 cals on my 2 ‘fast’ days every week. If I were to revisit fasting once again, do you recommend I intake zero calories on these days? Also, how many days would you recommend it in a week?

Finally (sorry about all the questions) do you exercise on fasting days? I go to the gym around 5 times per week, should I avoid going to the gym on fasting days?

Once again, thanks for a great article, most interesting thing I have read on Medium for weeks!

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