Featured Research

from universities, journals, and other organizations

Mood improves on low-fat, but not low-carb, diet plan

Date:
November 12, 2009
Source:
JAMA and Archives Journals
Summary:
After one year, a low-calorie, low-fat diet appears more beneficial to dieters' mood than a low-carbohydrate plan with the same number of calories, according to a new report.

After one year, a low-calorie, low-fat diet appears more beneficial to dieters' mood than a low-carbohydrate plan with the same number of calories, according to a report in the November 9 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.

Related Articles


Obese individuals who lose weight tend to have an improved psychological state, including a better mood, according to background information in the article. "Despite the consistency of official recommendations advocating a high-carbohydrate, low-fat, energy-restricted diet for obesity treatment, the obesity epidemic has led to widespread interest in alternative dietary patterns for weight management, including very low-carbohydrate 'ketogenic' diets that are typically high in protein and fat (particularly saturated fat)," the authors write. "While recent clinical studies have shown that low-carbohydrate diets can be an effective alternative dietary approach for weight loss, their long-term effects on psychological function, including mood and cognition, have been poorly studied."

Grant D. Brinkworth, Ph.D., of Commonwealth Scientific and Industrial Research Organisation-Food and Nutritional Sciences, Adelaide, Australia, and colleagues conducted a randomized clinical trial involving 106 overweight and obese participants who were an average age of 50. Of these, 55 had been randomly assigned to follow a very-low-carbohydrate, high-fat diet and 51 to a high-carbohydrate, low-fat diet for one year. Changes in body weight, mood and well-being, and cognitive functioning (thinking, learning and memory skills) were assessed periodically during and following the one-year intervention.

After one year, the overall average weight loss was 13.7 kilograms (about 30.2 pounds), with no difference between the two groups. Both groups initially (after the first eight weeks) experienced an improvement in mood. However, most measurements of mood revealed a lasting improvement in only those following the low-fat diet, while those on the high-fat diet returned to their initial levels (i.e., mood returned toward more negative baseline levels).

"This outcome suggests that some aspects of the low-carbohydrate diet may have had detrimental effects on mood that, over the term of one year, negated any positive effects of weight loss," the authors write. Potential explanations include the social difficulty of adhering to a low-carbohydrate plan, which is counter to the typical Western diet full of pasta and bread; the prescribed, structured nature of the diet; or effects of protein and fat intake on brain levels of serotonin, a neurotransmitter related to psychological functioning.

There was no evidence that the nutrient content of either diet was associated with changes in cognitive function, since both groups experienced similar changes in thinking and memory performance over time. "Further studies are required to evaluate the effects of these diets on a wider range of cognitive domains," the authors conclude.

This study was supported by project grants from the National Heart Foundation of Australia and the National Health and Medical Research Council of Australia. Simplot Australia, Mt. Buffalo Hazelnuts Victoria, Webster Walnuts Victoria, Stahmann Farms Queensland and Scalzo Food Industries Victoria donated foods for this study.


Story Source:

The above story is based on materials provided by JAMA and Archives Journals. Note: Materials may be edited for content and length.


Journal Reference:

  1. Brinkworth et al. Long-term Effects of a Very Low-Carbohydrate Diet and a Low-Fat Diet on Mood and Cognitive Function. Archives of Internal Medicine, 2009; 169 (20): 1873 DOI: 10.1001/archinternmed.2009.329

Cite This Page:

JAMA and Archives Journals. "Mood improves on low-fat, but not low-carb, diet plan." ScienceDaily. ScienceDaily, 12 November 2009. <www.sciencedaily.com/releases/2009/11/091109173614.htm>.
JAMA and Archives Journals. (2009, November 12). Mood improves on low-fat, but not low-carb, diet plan. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2009/11/091109173614.htm
JAMA and Archives Journals. "Mood improves on low-fat, but not low-carb, diet plan." ScienceDaily. www.sciencedaily.com/releases/2009/11/091109173614.htm (accessed October 25, 2014).

Share This



More Health & Medicine News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

IKEA Desk Converts From Standing to Sitting With One Button

IKEA Desk Converts From Standing to Sitting With One Button

Buzz60 (Oct. 24, 2014) IKEA is out with a new convertible desk that can convert from a sitting desk to a standing one with just the push of a button. Jen Markham explains. Video provided by Buzz60
Powered by NewsLook.com
Ebola Protective Suits Being Made in China

Ebola Protective Suits Being Made in China

AFP (Oct. 24, 2014) A factory in China is busy making Ebola protective suits for healthcare workers and others fighting the spread of the virus. Duration: 00:38 Video provided by AFP
Powered by NewsLook.com
WHO: Millions of Ebola Vaccine Doses by 2015

WHO: Millions of Ebola Vaccine Doses by 2015

AP (Oct. 24, 2014) The World Health Organization said on Friday that millions of doses of two experimental Ebola vaccines could be ready for use in 2015 and five more experimental vaccines would start being tested in March. (Oct. 24) Video provided by AP
Powered by NewsLook.com
Doctor in NYC Quarantined With Ebola

Doctor in NYC Quarantined With Ebola

AP (Oct. 24, 2014) An emergency room doctor who recently returned to the city after treating Ebola patients in West Africa has tested positive for the virus. He's quarantined in a hospital. (Oct. 24) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins