There are tons of questions about intermittent fasting, like these:
- Are artificial sweeteners allowed when fasting?
- Does fat interfere with autophagy during fasting?
- 500-calorie meal on fasting day?
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:
Are artificial sweeteners allowed when fasting?
Hello,
I have a sweet tooth and its difficult for me to have plain black coffee or tea. Stevia or xylitol would be risking the results of the fasting?
Macarena
Artificial sweeteners may stimulate insulin release. You can try fasting with the sweeteners – if you get good results, then continue.
Dr. Jason Fung
Does fat interfere with autophagy during fasting?
Hello Jason,
Specifically, does coconut oil, being 100% fat only and little else, have an effect on autophagy when it keeps ketones high as well?
Nicholas
Likely not, although research is lacking. Autophagy mostly turns off with protein.
Dr. Jason Fung
500-calorie meal on fasting day?
A number of fasting regimes (Every Other Day Diet and 5:2 Diet) recommend having a 500 to 600 calorie meal on ‘fasting’ days. Why is this? To me, this would spike insulin and temporarily break the fast. Wouldn’t it be better to just not eat anything on the fasting day? Is there a specific physiological reason why these authors recommend this, or is it to encourage participants’ compliance?
Thank you,
Jeff
The reason authors recommend it is because they believe a full fasting day (0 calories) is too hard for most people. I disagree. However, they do get good results with this modification and I have no problem with these sorts of regimens.
Dr. Jason Fung
More
Intermittent Fasting for Beginners
More questions and answers
Earlier Q&A sessions with Dr. Fung:
- “Do You Have Any Suggestions to Improve Sleep When Fasting?”
- When Should You Eat While Doing Intermittent Fasting?
- How Permanent Is the Effect of Intermittent Fasting on Insulin Resistance?
Many more questions and answers:
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)
Q&A videos
Top Jason Fung videos
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