Food and Fitness Science Roundup

by Paul Rogers on October 17, 2008

For this regular roundup, I try to find work that tells us something significant or new in the context of the field of study.

New Recommendations for Vitamin D Intake for Children from the American Academy of Pediatrics

A recommendation for a doubling of recommended dietary intake of an essential nutrient for any population sector is substantial news in nutrition science. The AAP list the reasons and the strategy here.

http://www.aap.org/pressroom/nce/nce08vitamind.htm

Coffee Drinking Does not Raise Mortality

Up to 6 cups a day and risks were still normal and even slightly lower than the consumers of much more moderate quantities. Adjustment of cardiovascular risk seems to be the difference — perhaps by lowering the risk of type 2 diabetes?

http://tinyurl.com/6al7ho

Ann Intern Med. 2008 Jun 17;148(12):904-14. The relationship of coffee consumption with mortality. Lopez-Garcia E, van Dam RM, Li TY, Rodriguez-Artalejo F, Hu FB.

Also see: Does Coffee Kill or Cure?

Red Wine Seems to Cut Risk of Lung Cancer

What? Not another reason to drink red wine! The authors do counsel against excessive consumption.

http://tinyurl.com/5u2wd3

Cancer Epidemiol Biomarkers Prev. 2008 Oct;17(10):2692-9. Alcoholic Beverage Intake and Risk of Lung Cancer: The California Men’s Health Study. Chao C, Slezak JM, Caan BJ, Quinn VP.

Vitamin C Interferes with Training Adaptation and Performance

I noticed the possibility of this a few years ago while researching the utility of antioxidants like vitamin C to benefit athletic performance. Vitamin C seemed to inhibit phosphofructokinase, which is an important enzyme in glycolysis (breakdown and use of glucose for energy). Considering that many athletes and fitness buffs seem to take vitamin C supplements, it may be worth noting. Moderate dietary intake is likely not a problem. We need more information on this one before the panic sets in.

Am J Clin Nutr. 2008 Jan;87(1):142-9. Oral administration of vitamin C decreases muscle mitochondrial biogenesis and hampers training-induced adaptations in endurance performance. Gomez-Cabrera MC, Domenech E, Romagnoli M, Arduini A, Borras C, Pallardo FV, Sastre J, Viña J.

http://tinyurl.com/5t85lh

Caffeine Plus Carbohydrate Increases Glycogen Storage

As far as I am aware, this is the first time this has been shown. About 500 mg caffeine is a lot of coffee though.

J Appl Physiol. 2008 Jul;105(1):7-13. High rates of muscle glycogen resynthesis after exhaustive exercise when carbohydrate is coingested with caffeine. Pedersen DJ, Lessard SJ, Coffey VG, Churchley EG, Wootton AM, Ng T, Watt MJ, Hawley JA.

http://tinyurl.com/6bwtv8

New Glycemic Index and Load Tables

If you’re into the GI, you’ll need this. More on the GI in another article. I’m not a big fan.

http://tinyurl.com/6flcjc

Click through to here from the abstract and you can download the free tables.

Diabetes Care. 2008 Oct 3. International tables of glycemic index and glycemic load values: 2008. Atkinson FS, Foster-Powell K, Brand-Miller JC.

Check out the Food for Life, Fit for Life Training Program. Free download available.


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