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Metabolizable Energy in Humans in Two Diets Containing Different Sources of Dietary Fiber. Calculations and Analysis^1,2,

Department of Nutrition, University of Uppsala, Box 551, S-751 22 Uppsala and Department of Medical Nutrition, Huddinge University Hospital F69, S-141 86 Huddinge, Sweden

The metabolizable energy (ME) of two high fiber diets, providing between 33 and 74 g dietary fiber (DF) per day, was calculated by application of Atwater's general factors (4, 9 and 4 kcal/g protein, fat and carbohydrate, respectively), Merrill and Watt's specific factors, and the British approach in which ME from carbohydrates is calculated by multiplication of the monosaccharide equivalent by 3.75 kcal/g. These factors were applied to the intakes of fat, protein and carbohydrate of 20 human subjects in two balance experiments. ME estimated by Merrill and Watt's factors agreed better with ME estimated in the balance experiment than did ME calculated by Atwater's factors or by the British approach. It was calculated that the DF in diet A, derived mainly from cereals, contributed 2.5 ± 1.4 kcal/g to ME of the diet. The corresponding figure for DF in diet B, derived mainly from beans, vegetables and fruits, was 3.1 ± 1.2 kcal/g. It was concluded that Merrill & Watt's factors represent the best system in current use for calculation of ME in DF-rich diets.

KEY WORDS: • balance experiment • dietary fiber • energy conversion factors • metabolizable energy

¹ Supported by the Swedish Agency for Research Cooperation with Developing Countries, the Swedish Nutrition Foundation, the Swedish Medical Research Council (Project B84-19X-06591-02A), the Swedish Council for Forestry and Agricultural Research, the Swedish Council for Planning and Coordination of Research and the Loo and Hans Osterman Foundation for Medical Research.

² This paper was presented at the XIIIth International Congress of Nutrition, Brighton. Göranzon, H. & Forsum, E. (1985) Metabolizable energy of two high fiber diets. Book of Abstracts, p. 67.

³ To whom reprint requests should be addressed.

Manuscript received 7 February 1986. Revision accepted 17 September 1986.