Low-carbohydrate diets and prostate cancer: how low is "low enough"?

Published

Journal Article

Previous studies indicate that carbohydrate intake influences prostate cancer biology, as mice fed a no-carbohydrate ketogenic diet (NCKD) had significantly smaller xenograft tumors and longer survival than mice fed a Western diet. As it is nearly impossible for humans to consume and maintain NCKD, we determined whether diets containing 10% or 20% carbohydrate kcal showed similar tumor growth as NCKD. A total of 150 male severe combined immunodeficient mice were fed a Western diet ad libitum, injected with the human prostate cancer cell line LAPC-4, and then randomized 2 weeks later to one of three arms: NCKD, 10% carbohydrate, or 20% carbohydrate diets. Ten mice not injected were fed an ad libitum low-fat diet (12% fat kcal) serving as the reference in a modified-paired feeding protocol. Mice were sacrificed when tumors reached 1,000 mm(3). Despite consuming extra calories, all mice receiving low-carbohydrate diets were significantly lighter than those receiving a low-fat diet (P < 0.04). Among the low-carbohydrate arms, NCKD-fed mice were significantly lighter than the 10% or 20% carbohydrate groups (P < 0.05). Tumors were significantly larger in the 10% carbohydrate group on days 52 and 59 (P < 0.05), but at no other point during the study. Diet did not affect survival (P = 0.34). There were no differences in serum insulin-like growth factor-I or insulin-like growth factor binding protein-3 at sacrifice among the low-carbohydrate arms (P = 0.07 and P = 0.55, respectively). Insulin was significantly lower in the 20% carbohydrate arm (P = 0.03). LAPC-4 xenograft mice fed a low-carbohydrate diet (10-20% carbohydrate kcal) had similar survival as mice consuming NCKD (0% carbohydrate kcal).

Full Text

Duke Authors

Cited Authors

  • Masko, EM; Thomas, JA; Antonelli, JA; Lloyd, JC; Phillips, TE; Poulton, SH; Dewhirst, MW; Pizzo, SV; Freedland, SJ

Published Date

  • September 2010

Published In

Volume / Issue

  • 3 / 9

Start / End Page

  • 1124 - 1131

PubMed ID

  • 20716631

Pubmed Central ID

  • 20716631

Electronic International Standard Serial Number (EISSN)

  • 1940-6215

Digital Object Identifier (DOI)

  • 10.1158/1940-6207.CAPR-10-0071

Language

  • eng

Conference Location

  • United States