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Impact of a 6-week non-energy-restricted ketogenic diet on physical fitness, body composition and biochemical parameters in healthy adults

Overview of attention for article published in Nutrition & Metabolism, February 2017
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • Among the highest-scoring outputs from this source (#21 of 921)
  • High Attention Score compared to outputs of the same age (98th percentile)

Mentioned by

2 news outlets
231 tweeters
28 Facebook pages
6 Google+ users
2 Redditors
9 video uploaders


62 Dimensions

Readers on

423 Mendeley
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Impact of a 6-week non-energy-restricted ketogenic diet on physical fitness, body composition and biochemical parameters in healthy adults
Published in
Nutrition & Metabolism, February 2017
DOI 10.1186/s12986-017-0175-5
Pubmed ID

Paul Urbain, Lena Strom, Lena Morawski, Anja Wehrle, Peter Deibert, Hartmut Bertz


The ketogenic diet (KD) is a very low-carbohydrate, high-fat and adequate-protein diet that without limiting calories induces different metabolic adaptations, eg, increased levels of circulating ketone bodies and a shift to lipid metabolism. Our objective was to assess the impact of a 6-week non-energy-restricted KD in healthy adults beyond cohorts of athletes on physical performance, body composition, and blood parameters. Our single arm, before-and-after comparison study consisted of a 6-week KD with a previous preparation period including detailed instructions during classes and individual counselling by a dietitian. Compliance with the dietary regimen was monitored by measuring urinary ketones daily, and 7-day food records. All tests were performed after an overnight fast: cardiopulmonary exercise testing via cycle sprioergometry, blood samples, body composition, indirect calorimetry, handgrip strength, and questionnaires addressing complaints and physical sensations. Forty-two subjects aged 37 ± 12 years with a BMI of 23.9 ± 3.1 kg/m(2) completed the study. Urinary ketosis was detectable on 97% of the days, revealing very good compliance with the KD. Mean energy intake during the study did not change from the habitual diet and 71.6, 20.9, and 7.7% of total energy intake were from fat, protein, and carbohydrates, respectively. Weight loss was -2.0 ± 1.9 kg (P < 0.001) with equal losses of fat-free and fat mass. VO2peak and peak power decreased from 2.55 ± 0.68 l/min to 2.49 ± 0.69 l/min by 2.4% (P = 0.023) and from 241 ± 57 W to 231 ± 57 W by 4.1% (P < 0.001), respectively, whereas, handgrip strength rose slightly from 40.1 ± 8.8 to 41.0 ± 9.1 kg by 2.5% (P = 0.047). The blood lipids TG and HDL-C remained unchanged, whereas total cholesterol and LDL-C increased significantly by 4.7 and 10.7%, respectively. Glucose, insulin, and IGF-1 dropped significantly by 3.0, 22.2 and 20.2%, respectively. We detected a mildly negative impact from this 6-week non-energy-restricted KD on physical performance (endurance capacity, peak power and faster exhaustion). Our findings lead us to assume that a KD does not impact physical fitness in a clinically relevant manner that would impair activities of daily living and aerobic training. However, a KD may be a matter of concern in competitive athletes. DRKS00009605, registered 08 January 2016.

Twitter Demographics

The data shown below were collected from the profiles of 231 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 423 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
United Kingdom 1 <1%
New Zealand 1 <1%
Poland 1 <1%
Unknown 420 99%

Demographic breakdown

Readers by professional status Count As %
Student > Bachelor 88 21%
Student > Master 77 18%
Student > Ph. D. Student 32 8%
Other 26 6%
Researcher 21 5%
Other 66 16%
Unknown 113 27%
Readers by discipline Count As %
Medicine and Dentistry 77 18%
Nursing and Health Professions 72 17%
Sports and Recreations 60 14%
Agricultural and Biological Sciences 32 8%
Biochemistry, Genetics and Molecular Biology 30 7%
Other 32 8%
Unknown 120 28%

Attention Score in Context

This research output has an Altmetric Attention Score of 189. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 17 February 2022.
All research outputs
of 21,717,421 outputs
Outputs from Nutrition & Metabolism
of 921 outputs
Outputs of similar age
of 277,994 outputs
Outputs of similar age from Nutrition & Metabolism
of 1 outputs
Altmetric has tracked 21,717,421 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 921 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 24.2. This one has done particularly well, scoring higher than 97% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 277,994 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 98% of its contemporaries.
We're also able to compare this research output to 1 others from the same source and published within six weeks on either side of this one. This one has scored higher than all of them