Cliff Harvey started changing the world 20 years ago, he’s still going. Catch up with his doctoral research, views on keto, mental health and more.
Issue 3 | Volume 1 | August 2019 In this issue: Articles Is the Ketogenic Diet Really a Cure for Cancer? The ketogenic diet is touted as a ‘cure’ for cancer with claims that it effectively starves cancer cells of fuel. But do these claims stack up? Can the Ketogenic Diet and Ketones Improve Brain Health? The ketogenic diet shows promise for improving brain health and reducing neurodegeneration. Find out what the science says in this special report. Research reviews and commentary Does Increased Fat in the Diet Cause ‘Keto-Crotch’? This study is often used to support the idea that a ketogenic diet results in less-than-pleasant odours on a keto diet! But does this study really show that?… Or something else entirely? Are Low-Carb Diets Deficient in Essential Nutrients? It’s commonly claimed that low-carb and keto diets are lacking in essential micronutrients. In this study by Caryn Zinn and colleagues of AUT University, they compare a healthy low-carb diet to a standard western-style diet. Can Ketogenic Diets Improve the Structure of Key Brain Cells Emering reserach is shwoing that ketogenic diets can aid supportive ‘glial cells’ of the brain. Find out what this means in this short review of a recent study that has hit the headlines. World Health Organisation’s Recommendations on Saturated Fat Are Out of Date… Recent expert reports have again challenged the outdated idea that saturated fat is a significant, independent impactor of mortality. Download the full review below:
ABC News https://www.abc.net.au/news/health/2019-07-04/who-saturated-fat-recommendations-out-of-date-expert-team-says/11274136 Article Summary In a new study published in the British Medical Journal,1 18 well-known researchers have disputed the World Health Organisations dietary guideline to reduce saturated fat to less than 10% of daily calories, and have stated that this dietary guideline is not backed by evidence. The authors summarised the key points of the paper as: 2018 WHO draft guidelines on dietary saturated fatty acids and trans-fatty acids recommend reducing the total intake of saturated fat and replacing it with polyunsaturated and monounsaturated fatty acidsThe recommendations fail to take into account considerable evidence that the health effects of saturated fat vary depending on the specific fatty acid and on the specific food sourceMaintaining general advice to reduce total saturated fatty acids will work against the intentions of the guidelines and weaken their effect on chronic disease incidence and mortalityA food-based translation of the recommendations for saturated fat intake would avoid unnecessary reduction or exclusion of foods that are key sources of important nutrients Comment The evidence ‘against’ saturated fat has been lacking for the entirety of the advisement against it. Of the systematic reviews and meta-analyses published, only the Hooper analysis showed detrimental effects from increasing saturated fats at the expense of other fats and even this finding has been disputed as the statistics used gave greater weight to smaller, more biased studies (as covered in a previous CARR). It is completely baffling that a dietary guideline based on such weak evidence (at best) continues to be…
Ketogenic diets might help to improve the function of important supportive brain cells.
A common criticism of low-carb and keto diets is that they do not supply adequate amounts of essential nutrients, but is this justified?
Recent articles have suggested that higher fat intakes are responsible for ‘keto-crotch’. Does this study support that contention?
Ketogenic diets and ketones themselves offer a promising treatment option for neurodegenerative disorders and cognitive decline.
The ketogenic diet is often touted as a ‘cure’ for cancer. But is this justified? Could there be risk from using a keto-diet for cancer?
Over 7 million copies of Eat Right for Your Type have been sold and many people follow a ‘blood type diet’. But does it stand up to scientific scrutiny?
Most people assume they need to ‘load up’ on carbs before training. But could this do more harm than good?
Could eating beef result in less loss of life than soy?
Issue 2 | Volume 1 | July 2019 In this issue: Articles Do Low Carbohydrate Diets Negatively Affect Female Hormone Balance? Many people think that low-carb diets are negative for female hormone balance, menstrual cycles, and ovulation. But does this stand up to scientific scrutiny? Can You Be ‘Healthy at Every Size’? ‘Health At Every Size’ (HAES) has become a very popular ‘anti-diet’ movement, and while it’s goals a laudable and it results in benefits, can you actually be healthy at every or any size? Research reviews and commentary How reliable is the statistical evidence for limiting saturated fat intake? Most reviews and meta-analyses show no effect of saturated fat on mortality but the influential Hooper meta-analysis of 2015 suggested increased risk of death from saturated fat in the diet. But was this finding reliable? In a new study, Simon Thornley and colleagues cast doubt on the findings of the Hooper analysis. Association of changes in red meat consumption with total and cause-specific mortality among US women and men: two prospective cohort studies A recent study has been highly promoted in the media as another ‘nail in the coffin’ for red meat, suggesting an increased risk of death from eating red meat. But was this effect really shown? From the media Rebuttal to the Physician’s Committee for Responsible Medicine article: “Keto Diet Is Dangerous for Veterans with Diabetes” A recent article by vegan advocacy group PCRM has attacked using low-carb for veterans with diabetes. In this article, researcher Cliff Harvey…
Key Findings HAES results in significant and lasting benefits to self-esteem, body image, hunger cues, and cognitive restraint.These results are similar to social support programsHAES does not result in substantive benefits to physical health.A combined approach, focussed on psycho-social and physical indicators of health is likely to the best approach Traditional weight loss methods are based primarily on a medical model which treats obesity as a disease requiring diet, exercise, or pharmaceutical intervention. Conversely, the increasingly popular ‘Health At Every Size’ (HAES) movement believes that “individuals who are overweight and obese want to exercise and eat healthy foods, and they are capable of doing so when barriers are removed”.1 The Health At Every Size® Principles are: Weight Inclusivity: Accept and respect the inherent diversity of body shapes and sizes and reject the idealizing or pathologising of specific weights.Health Enhancement: Support health policies that improve and equalize access to information and services, and personal practices that improve human well-being, including attention to individual physical, economic, social, spiritual, emotional, and other needs.Respectful Care: Acknowledge our biases, and work to end weight discrimination, weight stigma, and weight bias. Provide information and services from an understanding that socio-economic status, race, gender, sexual orientation, age, and other identities impact weight stigma and support environments that address these inequities.Eating for Well-being: Promote flexible, individualized eating based on hunger, satiety, nutritional needs, and pleasure, rather than any externally regulated eating plan focused on weight control.Life-Enhancing Movement: Support physical activities that allow people of all sizes, abilities, and interests to…
Most meta-analyses do not support the idea that saturated fat is a cause of heart disease but the 2015 meta-analysis by Hooper and colleagues suggested that saturated fat increased mortality. But was this study reliable? In a new analysis, Thornley et al., cast doubt on the reliability of this finding.
Key Findings Carbohydrate restriction does not result in alterations of ovulation, menses, or other indicators of women’s hormonal health. Low-carbohydrate diets have demonstrated positive benefits to women’s hormonal health. Extreme calorie restriction is likely to affect women’s hormonal balance and health. Those women who are leaner and exercise more are at greater risk of negative effects from excessive or prolonged energy restriction. A common claim currently doing the rounds is that a low-carb or keto-diet will negatively affect either ‘female hormone balance’, menstrual cycles, or ovulation. It is claimed that there is a minimum amount of carbohydrate (i.e. 200 g per day) required to preserve hormone status and ovulation, along with other indicators of hormonal health. Does This Claim Stack Up? There is no evidence that 200 g per day is required to preserve markers of female hormone balance. In fact, the most commonly cited study to support the idea that there is a minimum requirement for carbohydrate showed no such thing. Read more and listen to the audio below
A recent article by vegan advocacy group PCRM has attacked using low-carb for veterans with diabetes. In this article, researcher Cliff Harvey provides a rebuttal to the PCRM arguments against LCHF for diabetes.
A recent study has been highly promoted in the media as another ‘nail in the coffin’ for red meat, suggesting increased risk of death from eating red meat. But was this effect really shown?
A Summary of Our Research: How did people ‘feel’ on a keto diet? Very little research has been conducted on people’s subjective experiences of diet. The study of this is incredibly important because if we are to properly understand diet and prescribe, based on holistic effects, we need to know how people feel! Subjective perceptions of people on a keto-diet We analysed this in a qualitative study. We identified our participants subjective mood and experiences related to the ketogenic diet from daily diary entries and focus group findings. Read more & listen to the audio below
No matter where you look nowadays, someone is trying to sell you on a diet, pill or potion that promises to help you ‘detox’. In contrast, there are myriad scientists that will tell you that ‘detoxing’ is a bunch of BS and that there is no benefit to any diet or supplement that claims to help your body to detoxify. So, what is the real story? Is there any evidence backing ‘detox’ diets and supplements? Summary: Weight loss on detox diets is likely due to calorie restriction, not the elimination of toxins.In a healthy body, the liver does a great job of detoxification‘Poison is in the dose’ – there are few if any ‘bad’ foods and all chemicals only become dangerous at a particular dose and exposure.Spirulina and chlorella, milk thistle, dandelion, ginseng, onion, garlic, curcumin, resveratrol, selenium, zinc and vitamins A, C, and E reduce the oxidative damage associated with heavy metal toxicants.1-7Chlorella may be useful in inhibiting the absorption of dioxins via food and preventing accumulation of dioxins within the body.8Milk thistle reduces oxidative damage and may reduce entry of toxins into cells.9, 10 Will a detox help me to lose weight? Many people do lose weight on detox diets. It’s often claimed that this is because ‘toxins’ encourage the storage of fat, but in all likelihood, it is actually because while following a restrictive detox diet the person simply eats less. As an example, a 2015 study demonstrated that the ‘Lemon Detox’ diet helped women lose weight,11…
A summary of our research: Ketogenic supplements Low-carb diets and ketogenic diets are becoming increasingly popular for both lifestyle reasons and for the improvement of health and performance. However, there is little evidence for the superiority of keto- vs less restrictive low-carb approaches in the research. Greater carbohydrate restriction does provide additional benefits for some outcome measures like glucose, triglycerides (TG), and high-density lipoprotein cholesterol (HDL-c). There are also specific benefits from keto-diets and the levels of blood ketones they produce, including reduced inflammation, inhibited tumour growth (n some cancers), reduction in neurodegeneration, and increased metabolic flexibility. But, despite the benefits and popularity of keto, there is surprisingly little consensus in the published research on what nutritional ketosis (NK) actually is! There is also a complete lack of research on the time taken to achieve the common benchmark of nutritional ketosis ( ≥ 0.5 mmol/L beta-hydroxybutyrate (BOHB)) and on the symptoms of carbohydrate-withdrawal commonly described in mainstream media as ‘keto-flu’. Dietary supplements and methods to improve ketonaemia (blood ketone levels), time-to-NK, and symptoms of carbohydrate withdrawal and mood during keto-induction are similarly not well understood. Throughout my masters and doctoral research, my team and I provided, for the first time, a synthesis of research related to the time it takes for people to achieve ketosis and highlighted that there were no studies that had specifically evaluated adverse effects specifically during keto-induction. Read more & listen to the audio below