Extrem-LowFat-Diäten sind in fast jeder Hinsicht kontraproduktiv für Sportler (Stichwort: Immunsystem, Aufnahme von Micronährstoffen, Testosteron, Knochengesundheit, intramuskuläre Triglyceridspiegel ect.)

American Journal of Clinical Nutrition, Vol 49, 1169-1178, Copyright © 1989

Dietary carbohydrate-to-fat ratio: influence on whole-body nitrogen retention, substrate utilization, and hormone response in healthy male subjects

LJ McCargar, MT Clandinin, AN Belcastro and K Walker
Nutrition and Metabolism Research Group, University of Alberta, Edmonton, Canada.

The effect of a high-carbohydrate and a high-fat diet on nitrogen retention, substrate utilization, and serum hormone concentrations was assessed in six healthy male subjects. Both diets were fed at a level estimated to provide maintenance and 75% maintenance energy requirements. Urine and feces were collected and analyzed for N and energy content. Anthropometric measurements; fasting and postprandial oxygen consumption; and serum levels of glucose, triglycerides, and metabolic hormones were measured. The high-fat diet increased N retention at both energy levels with significance reached at maintenance energy intakes (p less than 0.05). The high-fat diet resulted in less weight loss (p less than 0.05) at low energy and a consistently lower respiratory quotient (p less than 0.05), indicative of increased fat oxidation. The N sparing effect of the high-fat diet did not appear to be explained by hormone levels observed but may be substrate mediated.
PS: Ein niedriger respiratory quotient (wie in obiger Studie beschrieben) scheint langfristig wahrscheinlich mit einer geringeren Fettzunahme in Verbindung zu stehen (Vgl.: Marra et al.: Fasting Respiratory Quotient as a Predictor of Long-Term Weight Changes in Non-Obese Women. In: Ann Nutr Metab 2004;48:189–192).