Click here to visit the EUFIC Homepage
Food Safety & Quality
Food Technology
Food Risk Communication
Nutrition
Health & Lifestyle
Diet-Related Diseases
Consumer Insights
Food for thought
EU initiatives
In the spotlight
Energy Balance

This website is certified by Health On the Net Foundation. Click to verify. This site complies with the Health on the Net Foundation Code for trustworthy health information:
verify here.



Very low carb diets could be incompatible with exercise

While very low carbohydrate (ketogenic) diets are popular with those trying to lose weight, there are concerns that such diets may not support the desire for exercise. This hypothesis was investigated by a US research team at Arizona State University.

Untrained overweight adults were randomly assigned to a ketogenic diet or a control diet, which was higher in carbohydrates. Both diets were designed to promote weight loss and were consumed for 2 weeks. The macronutrient content of the diets was 5% energy from carbohydrate, 65% from fat and 30% from protein in the ketogenic diet. In the control diet, the respective figures were 40%, 30%, and 30% of energy. Exercise testing was carried out at baseline and at the end of the study.

Average weight loss was similar over the 2-week period for both groups. As expected, subjects following the ketogenic diet demonstrated a large build up of blood ketones, indicating that their bodies were burning fat. Having a high blood ketone level was significantly associated with greater perceived effort during exercise and an increased feeling of fatigue.

The authors concluded that very low carbohydrate ‘ketogenic’ diets could reduce the desire to exercise and, thus, be counter productive for weight management.

For more information, see
White AM et al (2008). Blood ketones are directly related to fatigue and perceived effort during exercise in overweight adults adhering to low-carbohydrate diets for weight loss: A pilot study. Journal of the American Dietetic Association, Vol 107, pages 1792-96.

EUFIC related material:
Nutrition-Carbohydrates
Health & Lifestyle-Physical activity

ABOUT EUFIC
The European Food Information Council (EUFIC) is a non-profit organisation which communicates science-based information on nutrition and health, food safety and quality, to help consumers to be better informed when choosing a well-balanced, safe and healthful diet.

Read more
This site was last updated 01/09/2014
View all search results