The human requirement for copper. I. Healthy men fed conventional, American diets
| Autor: | Leslie M. Klevay, Juan M. Munoz, Robert A. Jacob, G M Logan, Sally J. Reck, H H Sandstead |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
chemistry.chemical_classification
Dietary Fiber Male Nutrition and Dietetics Bran Feces analysis Nutritional Requirements Medicine (miscellaneous) chemistry.chemical_element Urine Biology Carbohydrate Copper United States Diet Feces chemistry Basal (medicine) Humans Food science Essential nutrient Food Analysis Mathematics |
| Zdroj: | The American journal of clinical nutrition. 33(1) |
| ISSN: | 0002-9165 |
| Popis: | Each of 13 men was fed diets made from conventional foods for two to seven periods lasting 30 days in a metabolic ward. There was a total of 47 experimental periods. Supplementation of the basal diet with each of several bran or other fiber sources was done in no particular order; each subject was fed the unsupplemented diet for at least one period. The diet was designed to contain amounts of essential nutrients close to the Recommended Dietary Allowances; it resembled the "average" American diet as it contained 16% protein, 40% fat, and 44% carbohydrate. Only minimal variation in energy intake and physical activity of the men was permitted; body weight remained constant within +/- 2%. Copper in food, feces, and urine was measured during the last 12 days of each period. Linear regression of balance (intake minus the sum of fecal and urinary losses) revealed a daily requirement of 1.30 mg (95% confidence limits of 1.24 to 1.35 mg). On consideration of a calculated surface loss of 0.25 mg/day, the requirement is 1.55 mg/day. The requirement was unaffected by the type of fiber source. A review of published data revealed that this requirement substantially exceeds the amount of copper found in many conventional diets. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|