Saturday, June 11, 2016

Should Women Really Fast?

Ask Dr. Jason Fung

There are tons of questions about intermittent fasting, like these

  • Should I take supplements when fasting?
  • Can fasting have a negative effect on women?

Dr. Jason Fung is one of the world’s leading experts on fasting for weight loss or diabetes reversal. Here are a his answers to those questions and more:

Women and Fasting

I have heard that fasting can have negative side effects for women. Can you tell us more about that? Should women be concerned?


There is no more problems with women and fasting than with men and fasting. Please refer to my blog post about women and fasting for details.

Dr. Jason Fung

Supplements for fasting

Dr. Fung, very useful info.
Ramadan is right around the corner and I’ll be working very long hours at a bank. I want to take some supplements before sunrise to make sure my body’s getting the right nutrients, and my mind is prepared for daunting brain-draining tasks. Anything you would recommend? Thanks!!!

A general once a day multivitamin is sufficient. The body is able to supply all the brain’s requirements for energy during fasting. Most people feel their brain function increase, not decrease during fasting.

Dr. Jason Fung

The connection between calorie restriction and fasting

Hi Dr. Fung,
Where is the line between calorie restriction and fasting? At the moment, I’m mostly doing 16:8, ie, skipping breakfast, having my main meal at lunch and having a light supper such as broth with maybe some butter and an egg or some fried bacon. It occurs to me that this might be slipping into calorie restriction and my body could start burning less energy (as described in you analogy with coal power station).
I ask partly because of a surprise increase in weight over the last three days. Although this could be a blip.

It has nothing to do with calories. It has to do with reducing insulin to allow fat stores to be used for energy. There’s no easy answer to this question.

Dr. Jason Fung


More questions and answers

Many more questions and answers:

Intermittent Fasting Q&A

Read all earlier questions and answers – and ask your own! – here if you are a member:

Ask Jason Fung about intermittent fasting and type 2 diabetes – for members (free trial available)

Read Dr. Jason Fung’s new great book The Obesity Code for many more insights:

The Obesity Code

Videos about intermittent fasting

What is Fasting? – Dr. Jason Fung4.4 out of 5 stars5 star68%4 star16%3 star8%2 star2%1 star5%439 ratings43905:21How to Maximize Fat Burning – Dr. Jason Fung4.7 out of 5 stars5 star82%4 star8%3 star4%2 star0%1 star3%235 ratings23503:52How to Fast – The Different Options – Dr. Jason Fung4.9 out of 5 stars5 star91%4 star6%3 star0%2 star1%1 star0%113 ratings11306:47

The 7 Benefits of Fasting – Dr. Jason Fung4.7 out of 5 stars5 star85%4 star6%3 star2%2 star1%1 star3%110 ratings11007:33The Top 5 Myths of Fasting – Dr. Jason Fung4.9 out of 5 stars5 star91%4 star6%3 star1%2 star1%1 star0%97 ratings9708:23Breakfast! Is It Really That Important? – Dr. Jason Fung4.7 out of 5 stars5 star86%4 star5%3 star3%2 star3%1 star1%91 ratings9107:08

The Most Common Questions – Dr. Jason Fung4.8 out of 5 stars5 star86%4 star6%3 star4%2 star2%1 star0%43 ratings4305:385 Tips to Make Fasting Easier – Dr. Jason Fung4.8 out of 5 stars5 star84%4 star8%3 star5%2 star1%1 star0%59 ratings5905:19How to Get Started with Fasting – Dr. Jason Fung4.5 out of 5 stars5 star71%4 star13%3 star8%2 star4%1 star1%123 ratings12302:30

The Power of a 7-Day Fast – Dr. Jason Fung4.6 out of 5 stars5 star74%4 star16%3 star6%2 star1%1 star0%59 ratings5903:34Who Is Dr. Jason Fung?4.5 out of 5 stars5 star69%4 star13%3 star11%2 star3%1 star0%101 ratings10101:56The Perfect Treatment for Weight Loss and Diabetes – Dr. Jason Fung4.6 out of 5 stars5 star78%4 star10%3 star5%2 star3%1 star1%105 ratings10545:20

The 2 big lies of type 2 diabetes – Dr. Jason Fung4.7 out of 5 stars5 star83%4 star5%3 star4%2 star5%1 star0%68 ratings6842:54The Key to Obesity – Dr. Jason Fung4.6 out of 5 stars5 star78%4 star8%3 star8%2 star1%1 star3%82 ratings8244:22How to Reverse Diabetes Type 2 – Dr. Jason Fung4.9 out of 5 stars5 star88%4 star11%3 star0%2 star0%1 star0%26 ratings2610:23

The Etiology of Obesity – Dr. Jason Fung4.8 out of 5 stars5 star90%4 star4%3 star0%2 star2%1 star2%41 ratings4138:45

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