Dr. Jason Fung, MD


Dr. Jason Fung is a Canadian nephrologist. He’s a world-leading expert on intermittent fasting and low carb, especially for treating people with type 2 diabetes. He has written and he co-founded the Intensive Dietary Management program.

Dr. Fung has his own website at thefastingmethod.com.

Dr. Fung graduated from the University of Toronto and completed his residency at the University of California, Los Angeles. He lives and works in Toronto, Canada.

Dr. Fung occasionally collaborates with Team Diet Doctor on fasting related topics. Together we want to make it simple for people to understand and implement intermittent fasting, to improve their health. Below is some of the material with Dr. Fung on Diet Doctor.

About Dr. Fung

Watch Dr. Fung’s brief presentation above.


Written profile

Dr. Jason Fung: Dismantling diet dogma, one puzzle piece at a time


The fasting video course


The type 2 diabetes video course



  • What to do instead of counting calories
    Are all carbohydrates equally bad?
  • The perfect treatment for diabetes and weight loss
    Do you have to count calories to lose weight?



    The 2 big lies of type 2 diabetes
    The cause of obesity
    A new paradigm for type 2 diabetes
  • Therapeutic fasting
    The key to obesity
  • PCOS and insulin resistance
  • Understanding and treating type 2 diabetes – Dr. Jason Fung




  • Intermittent fasting – questions & answers


Q & A

Ask Dr. Jason Fung


More with Dr. Fung

Dr. Fung is also on Twitter, Facebook, Instagram, LinkedIn and YouTube.


The Obesity CodeThe Complete Guide to Fastingthe-diabetes-code (1)

Dr. Fung’s books The Obesity Code, The Complete Guide to Fasting and The Diabetes Code are available on Amazon.1  

Other publications

BMJ Case Reports 2018: Therapeutic use of intermittent fasting for people with type 2 diabetes as an alternative to insulin


Does sugar-free gum break a fast?
The biochemistry of insulin resistance
How do you repair low metabolism after a low-calorie diet?
Physician success story – Dr. Esther Kawira
How to transition from weight loss to maintenance mode?
How fasting made all the difference for Jennifer
After trying every diet, Karen reaches her goals by trusting the process
Sandra’s incredible weight-loss journey
Controlling hunger – part 2
Why is blood glucose elevated when fasting?
Video post: What is insulin resistance?
What is the optimal fast frequency?
Video post – what breaks a fast?
What is aging?
Longevity lessons from the Blue and ‘unBlue’ Zones
A different path to the same destination
"Can you get type 2 diabetes again once you've reversed it?"
Nutrition and your doctor
Announcing the Low Carb MD Podcast
Does fasting burn muscle?
PCOS, anovulatory cycles and hyperinsulinemia – PCOS 9
PCOS and hyperinsulinemia – PCOS 8
Could you fast for health without weight loss?
My single best weight loss tip
With one foot in the grave, Robert turned things around and lost 200 lbs
PCOS and hyperandrogenism – PCOS 7
PCOS and associated conditions – PCOS 6
PCOS and obesity – PCOS 5
The truth about salt
How to worsen diabetes: follow the worst of the ADA and CDA advice
The obesity epidemic
The difficulties of diagnosing PCOS - PCOS 4
'Is it okay to have cheat days?'
How Dolly turned her obesity and metabolic syndrome around
Hyperandrogenism – PCOS 3
Diabetes of bearded women – PCOS 2
Infertility, PCOS and the IDM program
Why does blood sugar increase during a fast?
When we eat is as important as what we eat – and this is why
What and when to eat to reduce insulin
Understanding obesity – the key to successful weight loss
How do you increase the length of your fasts without stressing the adrenals?
New book: The Diabetes Code
Cutting calories won't solve your weight issues – do this instead
When should you eat if you're working night shifts?
Do you recommend going in and out of ketosis?
The Warburg Effect and cancer
The 6 common features of cancer
The powerhouses of the cell and human diseases
What are the good and bad effects of fasting?
Why carbs and exercise are not the answers to reverse type 2 diabetes
The most important thing – practicing fasting safely
Is fasting every single day counterproductive?
Autophagy – a cure for many present-day diseases?
Fasting, cellular cleansing and cancer – is there a connection?
Can just the sight of food raise insulin?
'Can you have a normal blood sugar and still be insulin resistant?'
'How many times should I eat during my eating window?'
How to eat: fast and break-fast
Hyperinsulinemia and cancer
Fasting and diseases of excessive growth
Are trouble sleeping and anger common while fasting?
Medications that actually work for type 2 diabetes
Grazing or fasting – and why it matters for weight loss
"Life. Is. Good."
Can teenagers fast?
"Feeling amazing about life again"
How a thin person with diabetes reversed her type 2 diabetes
How to not get hungry: Fasting and ghrelin
Why type 2 diabetes is a reversible dietary disease
Why red meat won't kill you
Do you have to eat a minimum amount of carbs?
How carbs affect your cholesterol
Does eating extra fat make you fat?
Why does sugar make people fat?
Intermittent fasting vs. caloric reduction – what's the difference?
Fructose and fatty liver – why sugar is a toxin
Fasting and muscle mass
The ancient secret of weight loss
How Gina really healed herself from obesity and metabolic syndrome
Fasting and hunger
Does fat cause type 2 diabetes?
Fasting and exercise
Can intermittent fasting cause hormonal imbalances in women?
Fasting myths
How fasting reverses type 2 diabetes
Fasting and re-feeding syndrome
How fasting affects your physiology and hormones
Why fasting is more effective than calorie counting
Can I use cream in my coffee during fasting?
Fasting and cholesterol
Fasting and growth hormone
How does fasting affect your brain?
"Do you have any suggestions to improve sleep when fasting?"
Complications of diabetes – a disease affecting all organs
How to renew your body: Fasting and autophagy
Longer fasting regimens – 24 hours or more
More practical tips for fasting
Short fasting regimens – less than 24 hours
Practical tips for fasting
The common currency in our bodies is not calories - guess what it is?
How to use antibiotics: Why less is more
How Kevin Hall tried to kill the insulin hypothesis with pure spin
My top 8 weight-loss hacks
Women and fasting
How Gino reversed his type 2 diabetes by doing the opposite
Reversing type 2 diabetes: Sunny and Cherie
Why the first law of thermodynamics is utterly irrelevant
How to fix your broken metabolism by doing the exact opposite
How NOT to write a diet book
The Biggest Loser FAIL and that ketogenic study success
The diabetes economy
Can kids skip breakfast?
The 7 practical benefits of fasting

Potential conflicts of interest

Updated August 21, 2019.

Dr. Fung is a co-owner in the Diet Doctor company.

Dr. Fung receives money for treating patients with kidney disease in hospital for general internal medicine and obesity medicine. He owns parts of his medical practice.

He is also a part-owner at Intensive Dietary Management corporation, which provides education and support for fasting.

Dr. Fung receives money from his books The Obesity Code, The Diabetes Code, The Complete Guide to Fasting and The Longevity Solution, and articles on medium.com.

Dr. Fung speaks at conferences and occasionally receives speaking fees.

He has a YouTube channel discussing nutrition and fasting.

Dr. Fung eats a low-carbohydrate diet and fasts regularly.

Dr. Fung drinks tea daily. He receives consulting fees from Pique Tea.



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