Supports Chapter 4: Learning from history,
Chapter 19: 'Healthy eating' is fattening,
Chapter 20: Diabetes deceit, and
Chapter 21: Diseases of the heart and blood vessels
Results from a systematic review demonstrate, yet again, that low-carbohydrate, high-protein diets are more effective for reducing weight and improving cardiovascular health than are low-fat diets.
Catherine Rolland and colleagues from Robert Gordon University in Aberdeen, UK, carried out a systematic review of 13 randomized, controlled trials including a total of 1222 individuals comparing low-carbohydrate, high-protein diets with low-fat diets.
Inclusion criteria included publication between January 2000 and March 2007, length of at least 6 months, participants aged 18 years and above, and a mean or median body mass index of at least 28 kg/m2.
Of the 13 studies, five lasted for 6 months, six for 12 months, one for 17 months, and one for 36 months. Eleven studies compared low-carbohydrate, high-protein diets with low-fat, high-carbohydrate diets and two compared medium-protein with high-protein diets. Measurements were compared at 6 and 12 months.
At 6 months, weight loss was an average of 4.02 kg greater in the low-carbohydrate, high-protein group than in the low-fat diet group.
At 12 months, the difference between the two groups had reduced, with the low-carbohydrate, high-protein group having lost an average of 1.05 kg more than the low-fat group.
Rolland and team also noted improvements in serum lipids, although these were more mixed, as a significant improvement in high-density lipoprotein and triglycerides was seen favoring the low-carbohydrate, high-protein group up to 12 months, but improvements in total and low-density lipoprotein cholesterol were higher in the low-fat group at 6 months.
A nonsignificant trend toward improvement in diastolic and systolic blood pressure was also observed up to 17 months for the low-carbohydrate, high-protein group.
The researchers conclude in the journal Obesity Reviews that their results show low-carbohydrate, high-protein diets are more effective for weight loss up to 12 months than low-fat diets with unrestricted or high levels of carbohydrates.
They add that although trends toward cardiovascular improvement favoring the low-carbohydrate, high-protein diet were seen in this study, “more evidence and longer-term studies are needed to assess the long-term cardiovascular benefits from the weight loss achieved using these diets.”
But there have already been many studies, both clinical and epidemiologic dating back over 140 years.
For example, as I showed in Trick and Treat, a study conducted in 1932 with four different diets with the same number of calories but different constituents gave these results in grams of weight lost per day on average:
high-carbohydrate/low-fat diet – 49 grams (Typical 'slimming' diet)
high-carbohydrate/low-protein – 122 grams
low-carbohydrate/high-protein – 183 grams
low-carbohydrate/high-fat – 205 grams (As recommended in T&T)
Those were all 1,000 kcals. But obese patients also lost weight at 2,700-kcals - but only on the low-carb high fat diet.
How much more evidence will it take before the disastrous 'healthy eating' experiment is called to a close - and those perpetrating it, and who are responsible for the increasing ill-health in our society, are called to account?
Hession M, et al. Systematic review of randomized controlled trials of low-carbohydrate vs. low-fat/low-calorie diets in the management of obesity and its comorbidities. Obes Rev 2009; 10: 36-50