...But, in the protein-rich,
high-exercise group, Layman noted a statistically significant
effect. That group lost even more weight, and almost 100 percent of
the weight loss was fat, Layman said. In the high- carbohydrate,
high-exercise group, as much as 25 to 30 percent of the weight lost
was muscle....

http://www.kticam.com/news/agricultural/index.cfm?id=12094