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The Ketogenic Diet: Dietary Cancer Trend 

The implementation & understanding of the ketogenic diet is very controversial and confusing. Proclamations of it’s success are widely distributed however the correct application of this diet is rarely achieved. With this article I hope to give you a good understanding of this very specific diet, it’s implications, drawbacks, benefits and what should be considered by cancer patients prior to pursuing this dietary trend.

What Is The Ketogenic Diet? 

The ketogenic diet is high fat, moderate protein and very restricted carbohydrates. The reduced supply of glucose causes our internal biochemical pathways to switch to metabolising fat instead of glucose for ATP energy. By lowering the intake of carbohydrates to a very low amount, the body is induced into a state called ketosis. Nutritional ketosis is a natural reaction from the body to help humans and animals survive when carbohydrate or starvation occurs. Ketones are produced by the liver as a by-product of fat breakdown when glucose levels are low.

The body is put into this metabolic state not through starvation but through the starvation of carbohydrates. If you give the body high quality fats and take away carbohydrates the body will begin to burn ketones as a main source of energy.

There is a common misinterpretation of nutritional induced ketosis and ketoacidosis.

Nutritional ketosis is a controlled, insulin-regulated process which results in a mild release of fatty acids and ketone body production due to the ‘fasting’ of sugar/reduction of carbohydrate intake.

Ketoacidosis, on the other hand, is caused by the lack of insulin in the body. Without insulin or a functioning pancreas, the blood sugar levels rise to high levels. This excess amount in turn produces abnormal quantities of ketones.

What exactly does it mean to restrict carbohydrates?

On a typical SAD (standard American/Australian diet) the ratio is about 50% carbohydrate, 15% protein and 35% fat. The main source of energy is carbohydrates.

On a ketogenic diet the ratio consist of 80% fat, 15% protein and 5% carbohydrates. Therefore the main source of energy is fats (lipids).

5% carbohydrate intake generally means less than about 30grams of carbohydrate consumption per day. To reach ketosis, no more than a maximum of 40-50grams of carbohydrates per day.
Let me visualize how much sugar intake this is; 30-50 grams of sugar is roughly three regular carrots or one medium sized apple.

What Can I Eat On A Ketogenic Diet?

Foods that can be eaten in ABUNDANCE:

  • free range eggsGrass-fed and wild animal sources
    grass-fed beef, lamb, goat, venison, wild caught fish and seafood, pastured pork and poultry, free range eggs, gelatine, ghee, butter, offal (liver, heart, kidneys, and other organ meats)
  • Healthy fats
    saturated (lard, chicken fat, duck fat, goose fat, clarified butter, ghee, butter, coconut oil)
    monounsaturated (avocado, macadamia and olive oil)
    polyunsaturated omega 3s
  • KaleNon starchy vegetables
    leafy greens (Swiss chard, bok-choy, spinach, lettuce, chard, chives, radicchio etc.)
    some cruciferous vegetables like kale and kohlrabi
    celery stalks, cucumber, zucchini, asparagus
  • avocadoFruits
  • Beverages and condiments
    water, coffee (black or with some coconut milk/cream), tea
    mayonnaise, mustard, pesto, bone broth, pickles (as long as made without sugar), fermented foods (kombucha, kimchi, and sauerkraut)
    all spices and herbs, lemon, lime and zest
    egg white protein and gelatin

Foods that should be eaten MODERATELY:

  • Vegetables, Mushrooms and Fruits
    some cruciferous vegetables (cabbage, cauliflower, broccoli, brussels sprouts, fennel, turnips)
    nightshades (eggplant, tomatoes, capsicum)
    some root vegetables (spring onion, leek, onion, garlic, mushrooms, squash)
    sea vegetables (nori, bean sprouts, sugar snap peas, artichokes)
    berries (blackberries, blueberries, strawberries and raspberries)
    coconut, rhubarb and olives
  • Grain fed animal sources and full fat dairy
    beef, poultry, eggs and ghee
    dairy products
  • Nuts and seeds
    macadamia nuts
    pecans, almonds, walnuts, hazelnuts, pine nuts, flaxseed, pumpkin seeds, sesame seeds,sunflower and hemp seeds
    brazil nuts
  • Fermented soy products
    only is GMO free like tempeh, soy sauce or coconut aminos
    edamame is unprocessed
  • Condiments
    arrowroot, xanthan gum
    cocoa and carob powder, extra dark chocolate 70%
  • Alcohol
    dry red wine, dry white wine, spirits (unsweetened)
  • Note: some vegetables like celery root, carrot, beetroot, parsnip and sweet potato can be eaten occasionally but depends on your average carbohydrate limit for the day.

Foods which should be AVOIDED:

  • no-breadpotatoes
  • sugary drinks
  • alcoholic drinks
  • processed foods
  • soda and juice
  • legumes
  • sugar
  • vegetable oils
  • sweet fruits
  • dried fruits
  • low fat foods
  • processed treats
  • factory farmed meats and fish
  • grains and gluten

What Happens When You Cheat?

Glucose is the easiest molecule for your body to convert and use as ATP energy, so it will be chosen over any other energy source. Therefore if carbohydrates are eaten more than the daily limit of a ketogenic diet the body will in seconds switch back to glucose metabolism. People who cheat are constantly putting themselves back to square one and out of ketosis. Additionally they will gain a lot more weight because of the combined effect of carbs and fat. This is not a diet you can cheat with, ketone levels in the blood will lower and the person will need to start again.

A day on a ketogenic diet could look like this:

Info-graph taken from Practical Keto Meal Plans for Cancer by Patricia Daly.

How Long Does It Take To Enter Ketosis?

It can take anywhere from 4 days to 4 weeks to enter ketosis. It depends on the individual and whether the restricted carbohydrate limit is maintained vigilantly. Exercising can help speed up the process since it helps deplete the glycogen stores within the body.

Why Can’t I Get Into Ketosis?

Too much protein consumption can result in elevated blood glucose levels through a process called gluconeogenesis. This could be reason why some individuals are unable to build ketones. Although eating a restricted low carb, the protein ratio could possibly be too high. Gluconeogenesis (GNG) is a metabolic pathway that results in the generation of glucose from certain non-carbohydrate carbon substrates.

Are You Eating Enough Fat?

This is a very important question on the ketogenic diet. Whether or not a person is eating enough lipids (fats) can be measured through the ketone levels. The ketone level should be between 1-3. If the ketone levels go beyond 4-5 it is important to see a doctor.

1. Urine testing

Urine test strips are not as accurate and may not work for some individuals. The strips only show excess ketone bodies excreted acetoacetate via urine but there is nothing which tells the person about the level of ketones in the bloodstream which could be higher.

2. Blood testing

This is the most accurate way to measure the ketone bodies, beta-hydroxybutyrate. Blood ketone meters can precisely determine the level of ketones in your blood but they are also pricey.


How Can A Ketogenic Diet Work For Cancer Patients? 

When we eat a carbohydrate filled meal our digestive system breaks down the carbs into glucose which enters into our blood stream. When this happens our blood sugar levels peak and this triggers the pancreas to excretes insulin and bring the blood sugar level back down. So why is it imperative to lower glucose and insulin in the blood stream? This is because insulin pushes the glucose into the cells but cancer cells have an advantage and take the extra glucose. Resulting in cancer growth.

The ketogenic diet lowers the levels of insulin inhibiting hormones such as the insulin growth factor IGF-1 and other metabolic pathways which promote cancer progression. Cancer cells have a defective mitochondria (energy house), therefore glucose supplies leave them with no possibility to repair the oxidative stress which constantly bombards cells. Cancer cells are then more likely to suffer injuries from interactions with oxidising free radicals. Radiation therapy works by increasing free radical activity around cancer tissue and studies have shown that being in nutritional ketosis seems to enhance this destructive free radical effect.

There have been published research papers on ketogenic diets and the anti-inflammatory effect of ketone bodies on certain conditions like epilepsy, Parkinson’s Disease, Alzheimer’s Disease, Type 2 diabetes, cardiovascular disease, autism, migraines, stroke, depression and of course cancer.

Unlike the normal cells within our bodies, data has shown that cancer cells are unable to generate a substantial amount of energy from ketone bodies and rely immensely on glucose. This desire for glucose is correlated to the fact that cancer cells have a defective mitochondria; therefore in rapidly growing tumours the glycoltic rate if up to two hundred times higher than normal tissues.

Since cancer cells do not have the capability to metabolise ketones as a source of ATP, the ketogenic diet would destabilise tumour tissues DNA. Therefore reduce tumour size over some time and this in turn can enhance life for cancer patients.

It has even been studied and stated that a ketogenic diet could work well along side mainstream cancer treatments such as chemotherapy and radiation.

What are the benefits?

  • reduce the development of new blood cells required to fuel tumours
  • restore apoptosis of cancer cells
  • destabilise the DNA in tumour cells
  • over time reduce the tumour size
  • reduce levels of insulin and cancer promoting hormones
  • reducing inflammations


A study published in June 2013 The Ketogenic Diet and Hyperbaric Oxygen Therapy Prolong Survival in Mice with Systemic Metastatic Cancer. Explained that the low carbohydrate, high fat diet decreased blood glucose and elevated blood ketones had a slowed progression of cancer in both animals and humans. The study showed that the ketogenic diet increased survival time by 56.7% in mice with systemic metastatic cancer. The hyperbaric oxygen did little on it’s own to influence the cancer progression but with the combination of ketogenic diet had a significant effect increasing the survival time to 77.9% in mice.

Another study published in July 2011 discussed how tumours utilise glucose as their main source of energy. Thus this diet for a cancer patient would starve the carbohydrate ‘glucose’ source which tumours thrive from. This study was conducted with 16 patients with advanced metastatic tumours and without conventional options. The study suggested the ketogenic diet is suitable for even completely advanced cancer patients. There was no severe side effects and might improve some aspects of their quality in life. It documented an improved emotional functioning and less insomnia.

Sounds Like An Effective Diet? What are the drawbacks? 

Unfortunately nothing is ever as black and white as it seems.

This diet is considered a last resort treatment for many cancer patients, due to the one way street this diet entails. Once the metabolic process changes over to ketones reverting back to glycolysis as the major source for ATP can result in a dramatic and detrimental growth of cancerous tissue. It’s dangerous due to the depriving and starving of the cancer cells and then the re introduction of glucose (even if it’s a low carbohydrate diet), the cancer regains it’s food source and can explode much more aggressively.

That this is a one way street for cancer patients is NOT expressed enough online or made clear to patients.

Secondly a point which many people forget after reading all the benefits of a ketogenic diet are the restrictions. Ketogenesis is an extremely restrictive, commitment requiring diet. It can’t be done half heartedly and as a cancer patient it should be a lifestyle choice not a trend you follow now to see if it works. Many people have troubles adhering to the diet, especially at social functions, outings, restaurants, work environments, gatherings and so forth.

Before considering this diet it needs to be checked and established that there is an adequate production of bile acids and pancreatic lipase. If a patient has a cholecystectomy (gall bladder removal) the ketogenic diet should not be pursued. Even in healthy individuals supplementation of lipase and bile salts might be required due to the increase in fat metabolism.

Additionally this diet is lacking in many different nutrients. The ketogenic diet lacks in grains, fruits, some vegetables, and legumes. Therefore lacking in vitamin B’s, phytonutrients and antioxidants. This diet would require additional supplementation and checking of the blood work and mineral levels to make sure the body stays within homeostasis. Also due to the increased intake of fat it can lead to an acidified system. Therefore the regular intake of chlorophyll and other foods rich in phenols aid to alkalise the body.

Lastly the transition over to a ketogenic diet isn’t always considered easy. There are several different symptoms and experiences an individual can have. It has been documented that individuals can loose minerals such as salt, potassium and magnesium. Also weight loss is experienced through the ketogenic diet. Many people can loose several kilograms until reaching a weight that stays stable, it is certainly something to keep an eye if weight keeps dropping.

  • Keto-Food-PyramidFeeling of fatigue
  • Dizziness
  • Lightheadedness
  • Headaches
  • Constipation
  • Blood sugar drops
  • Strong sugar cravings
  • Shakiness
  • Feeling of weakness
  • Muscle cramps or aches
  • Disrupted sleep
  • Diarrhoea
  • Flatulence
  • Frequent urination
  • Clarice Hebblethwaite says:

    Thanks so much Deborah. This is a great summary of the diet, monitoring and the difficulties and one way nature of it. I have supported a few people attempting this for weight loss but getting into and staying in ketosis is really challenging. And they want to lose weight so that side of it is not an issue!
    I have had real concerns about the lack of phytonutrients and antioxidants too plus I have been reading lately advice by Anthony Williams aka Medical Medium who believes a high fat intake can accelerate oxidation of heavy metals and also fuel viruses. So more food for thought.

    • Zoe Alexander says:

      Can you clarify eggs and cruciferous veggies please? I see they’re listed under foods not to eat, but there’s images of them in the food triangle and eggs appear in the sample diet.
      Thank you!

      • Marty Mutzelburg - TRULY HEAL ADMIN says:

        Eggs and some cruciferous veggies are in the “eat in abundance” list. The headings were a little confusing so I’ve edited them accordingly Sorry for the confusion.

        • Thank you! Thought they must be but never sure… 🙂
          Great article!

  • Be super careful with this diet. I would stay away. Six months before my cancer diagnosis, I was on a full ketogenic diet. I grew a big tumor during this diet. After researching it, I found out that tumors use other fuels such as ketones (Google it) and can grow bigger and meaner on those other fuels. Don’t be deceived into thinking this can help you. I’ve been looking into this for for years and the research is unimpressive. There’s been tons of clinical trials that end up dead (no pun intended). Nothing comes out of the clinical trials using the ketogenic diet alone. This is a BIG red flag. Look up clinical trials for cancer and ketogenic diet. For more than 5 years, this theory has been looked into and so far nothing has come out of it. Don’t risk it, it’s not worth it. Eat healthy and don’t go into a ketogenic state if you have cancer.

    • Deborah Freudenmann says:

      Hello Gliese,

      Thank you for bringing this valid concern to the post. This is very true. The research on the Ketogenic Diet is minimal and poorly done, much more needs to be studied in respect to understanding the long term relationship between cancer and ketosis. I have personally experienced a cancer patient whose cancer also grew after embarking on the Ketogenic diet. As I stated in the post, this diet requires serious consideration and certainly isn’t the glorified diet stated all over the internet. There are patients who have success whereas others do not. Primary stage cancer patients seem to respond much better to specific diets. However secondary stage cancer patients in conjunction with or after the use of treatments seem to be much more aggressive; and transform any form of food for the growth of cancer cells. Diet’s are never a one fit all but always an individualised protocol.

      Thank you for sharing.
      Warmest Regards

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