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The Metabolizable Energy of Diets Differing in Dietary Fat and Fiber Measured in Humans

U.S. Department of Agriculture, Agriculture Research Service, Energy and Protein Nutrition Laboratory, Beltsville Human Nutrition Research Center, Beltsville, MD 20705

The metabolizable energy of two diets differing in fat and fiber content was measured in balance experiments in 42 adult male subjects. Subjects received each diet for 10 wk in a crossover design. Average fiber consumption from mixed sources (cereals, legumes, fruits and vegetables) while consuming the low fiber, high fat diet was 34 g/d and 64 g/d while consuming the high fiber, low fat diet. The percentages of energy from protein, fat and carbohydrate were 16, 18.5 and 65.5, respectively in the high fiber, low fat diet and 14.5, 36 and 49.5, respectively, in the low fiber, high fat diet. Seven-day composite collections of food, urine and feces were made during the 10th wk of the study. The freeze-dried food and fecal samples were analyzed for total energy content and for protein, fat, moisture, ash and carbohydrate. Urine samples were analyzed for nitrogen and energy content. The digestibility of the energy-containing nutrients was significantly lower when subjects were consuming high fiber, low fat vs. low fiber, high fat diets (95.4 vs. 97.0, carbohydrate; 92.5 vs. 95.5, fat; 83.7 vs. 89.4, protein; and 91.4 vs. 94.3, energy).

KEY WORDS: • metabolizable energy • fiber • humans • fat

Manuscript received 27 August 1990. Revision accepted 12 August 1991.