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"A low-carb content child can lose more than 1.5 rocks for three years," reports The Daili Telegraph.
Researchers in the United States conducted a trial involving 164 people who had already lost weight on a 10-week diet, during which all meals were provided.
They gave them another 20 weeks of living space for weight loss.
During this phase, they received meals with different levels of carbohydrate content – 60%, 40% or 20% of total energy, which represents a high, medium or low carbohydrate diet.
The diet also differed in fat content, and the low-carb diet content was supplemented with a 60% fat content.
Loss of weight and maintenance between groups did not differ during the 20-week trial.
But researchers have said that the low-carb low-carbon group burned 209 calories a day from the high carbohydrate group.
They predicted that by that course a typical thirty-year-old man in theory could lose up to 10kg during 3 years after feeding with low carb content. This was assumed by analyzing sample samples of participants.
The question of whether a child with high carbohydrate or low carbohydrate levels is working is more and more hardly challenged.
Recent studies have shown little difference in the success of people in losing weight on two types of diets.
But these studies were short-lived. The difficulty is in measuring the effects of diet over the years, and not on Sundays, in the real world where people choose their own food.
We also do not know how to combine lov-carb and high fat foods to affect other health risks, such as heart disease.
Where does the story come from?
The study was conducted by researchers from Boston Children's Hospital, Framingham State Université, Arkansas Université and Bailor College of Medicine.
The project is funded by the Science Initiative for Nutrition Science, the Nev Balance Foundation, the Mani Voices Foundation and the Blue Cross Blue Shield.
It was published in a revised magazine British Medical Journal and is free to read online.
One study author published several books on nutrition that promote low-carbohydrate diet concepts.
The study was precisely shown in terms of energy consumption results.
But the UK media did not suggest that the study did not show long-term weight loss or maintenance, or that the three food groups were equally likely to retain weight loss during the 10-week maintenance period.
What is this research?
This is a randomized controlled trial, which is usually the best way to see if the treatment works.
But in this case, the main results of the researchers include biochemical energy consumption measures, instead of actual weight loss or maintenance.
This means that the results indicating weight loss are hypothetical and not real.
What did research involve?
Adults from 18 to 65 years at the University of the United States are recruited to participate in a weight loss study.
They all had a BMI of 25 or more at the start of the study. They were paid to participate and have all meals.
During the 10 weeks, 234 participants followed the same diet diet, designed to provide 60% of estimated calorie requirements, with the goal of losing 12% of body weight.
At the end of the 10 weeks, 164 people (70%) achieved the desired weight loss.
At that time, one of the 3 diets for maintenance of weight for 20 weeks were randomly assigned, in which the calorie intake was adjusted to maintain their body weight stable.
The weight maintenance children were:
- 60% carbohydrates, 20% fat, 20% protein (high carbon)
- 40% carbohydrate, 40% fat, 20% protein (moderate carb)
- 20% carbohydrate, 60% fat, 20% protein (low carbon)
The researchers gave participants an isotope marked water (where water was "labeled" with a substance) and compared urine samples before and after the diet to measure the total energy consumption of the participants.
This allowed them to compare the average energy consumption for different children for people with specific weights.
What were the basic results?
The average weight loss for the first part of the study was 9.6kg.
Out of 164 who began to maintain weight, 2 stopped the study, leaving the results of 162.
Of this, 120 remained in the target of 2 kg of their weight for weight loss (38 in the group with high carbohydrates, 39 in the group with moderate carbohydrates, 43 in the group with low carboma content).
Using the results of all 162 participants:
- body weight on average changes on average less than 1kg during the maintenance phase, and there was no significant difference in weight changes between the group for the child
- energy costs were reduced by 19 kilograms per day in the high carbohydrate group (confidence interval of 95% [CI], 104 to +66)
- energy consumption increased by 71 kcal per day in the moderate carbohydrate group (95% CI -12 to +155)
- energy consumption increased by 190 kcal per day in a low-carbine content group (95% CI +109 to +270)
- compared with the high carbohydrate group, the low carbine group had a daily energy consumption of 209 kilograms per day
Hormone, which supposedly increases hunger, reduces energy consumption and promotes fat storage, was lower in people who had a low-carb diet.
How did the researchers interpret the results?
The researchers said that the difference in energy consumption, if continued for 3 years, would translate to an estimated weight of 10kg for a typical 30-year-old man who is 1.78m high and weighs 100kg, assuming no change in diet and an average level of activity .
It seems that "the composition of the diet affects the energy consumption regardless of body weight," they said.
They added that low-carbohydrate diet "can help keep weight loss out of conventional focus on limiting energy intake and boosting physical activity."
Conclusion
While the results of the study are theoretically interesting, they do not show any real, physical evidence of increased weight loss or improved body maintenance for people who have been following low-carbohydrate foods rather than high or moderate foods.
The study has a number of limitations. The authors say that using isotopic water is indicated that the "gold standard method" [measurement of total energy expenditure] in free residents ".
But as the study does not include evidence of the different weight loss in people on the 3rd child, we can not say whether the measured difference in energy expenditure actually results in differences in weight loss.
The study is also limited as it is translated into the real world. People in the study lost a significant amount of weight over the course of 10 weeks, during which they had all their meals prepared for them, with calories and a proportion of carbohydrates, fats and proteins. It's not like most people eat.
The study lasted only 20 weeks. We know that many people who will lose weight during the diet measured in weeks or months will again burden within 2 years.
This study provides interesting theoretical information on how the body can metabolize the diet of various combinations of foods.
It does not provide long-term research in the real world to show which kids work best for weight loss and maintenance in practice, and can there be any associated unwanted outcomes.
Learn more about healthy weight loss with the NHS weight loss plan.
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