I will share with you what I just shared with another concerned user. Basically what is being advocated for is a low carb, high fat/protein diet. This would essentially be a ketogenic diet.
Ketogenic diets have been shown to be helpful with children with epilepsy for the short term. All other aspects of the diet for the short term show ill health effects. Its not something you want to put your body through. I will share the SHORT TERM evidence below. The long term evidence is also damning, but here is short term data.
“Cognitive Effects of Ketogenic Weight-Reducing Diets,” researchers randomized people to either a ketogenic or a nonketogenic weight loss diet. Although both groups lost the same amount of weight, those on the ketogenic diet suffered a significant drop in cognitive performance.After one week in ketosis, higher order mental processing and mental flexibility significantly worsened into what the researcher called a “modest neuropsychological impairment.”
A review over low carb diets revealed that “Complications such as heart arrhythmias, cardiac contractile function impairment, sudden death, osteoporosis, kidney damage, increased cancer risk, impairment of physical activity and lipid abnormalities can all be linked to long-term restriction of carbohydrates in the diet.”
Low-Fat Versus Low-Carbohydrate Weight Reduction Diets
Effects on Weight Loss, Insulin Resistance, and Cardiovascular Risk: A Randomized Control Trial
This study looked at 24 people who were overweight/obese and divided them into 2 groups. One group was low carb, high fat and the other high carb, low fat.
High carb group: 20% calories from fat/60% calories from carbs
Low carb group: 60% calories from fat/20% calories from carbs
In addition, the study was designed so that participants would lose 1 pound per week, so calories were reduced by 500 per day.
Volunteers were given pre weighed foods given as daily portions and were assessed by a dietician to make sure that they were adhering to the diet. After 8 weeks, this is what was found to be significant between the two groups. The low carb, high fat group experienced arterial stiffness which basically means impaired arterial function. What this means is that the people on this diet experienced low grade inflammation which can lead to the growth of atherosclerotic lesions and can become heart disease. “It is possible that the high fat content of a low-carbohydrate diet exerts detrimental effects on endothelial function, which raises concerns regarding the long-term safety and efficacy of low-carbohydrate diets…Currently, supported by evidence from long-term trials, we believe that a low-fat diet should remain the preferred diet for diabetes prevention.”
Benefit of Low-Fat Over Low-Carbohydrate Diet on Endothelial Health in Obesity
20 subjects participated in this study. “The [low carb] diet provided 20 g of carbohydrates daily, supplemented with protein and fat content according to the Atkins’ diet recommendation.19 The [low fat] diet provided 30% of the calories as fat, modeled after an American Heart Association diet.” I wouldn’t exactly call the low fat diet “low fat”, but regardless, its far less fat then the low carb diet. Both groups were given 750 calories less with pre made meals so they would stick with the protocol.
After 6 weeks, there were significant differences between the low carb and the low fat group. The researchers performed a brachial artery test which basically tests to see if arterial function is impaired or not. Typically, the arm is cut off from circulation for about 5 min., then they release the arm, and measure how dilated the blood vessels are. If the blood vessels are constricted, it represents arterial impairment whereas dilation indicates good arterial health.
On week 2 of the diet, both low carb and low fat groups had poor arterial health and were not significantly different, but by week 6, those on the low carb diet had far worse arterial health then before, and those eating low fat had far better.
This again shows that this type of diet is promoting heart disease risk.
Low carbohydrate, high fat diet increases C-reactive protein during weight loss.
Unfortunately, I was unable to find the full text of this study so it is difficult for me to view the details and all I can do is base my conclusions of the study based on the abstract which is not something I like to do. Regardless, the study revealed a very interesting finding. It showed that when subjects of the study went on a low carb, high protein diet for 4 weeks, they had a 25% increase in C-reactive protein. C-reactive protein is a marker of inflammation which basically means that this group of people were promoting the development of a chronic disease. In contrast, the high carbohydrate subjects decreased their levels of C-reactive protein by 48%.
Comparative Effects of Three Popular Diets on Lipids, Endothelial Function, and C-Reactive Protein during Weight Maintenance
This study is quite interesting. It examined 18 adults aged 20 or over for 6 months. The aim of the study was to examine their health when on 3 diets, the Atkins diet (high fat, low carb), the South beach diet (Mediterranean) and the Ornish diet (low fat, high carb). They found no significant differences between the 3 diets in terms of calories consumed. The results are interesting as seen in table 1 of the study.
They found higher LDL in the Atkins diet and lower LDL in the low fat Ornish diet. They also found significantly higher levels of C-reactive protein in the atkins diet as opposed to the Ornish diet. What was also found was that the atkins diet had poor results for the Brachial Artery test which again shows impaired arterial function. “High saturated fat intake may adversely impact lipids and endothelial function during weight maintenance. As such, popular diets such as Atkins may be less advantageous for CHD risk reduction when compared to the Ornish and South Beach diets”
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Author: Michael Greger M.D. FACLM
Author URL: https://nutritionfacts.org/author/mgreger/
Original Article Location: https://nutritionfacts.org/video/nutrient-dense-approach-to-weight-management/