<P> The essential nutrient elements for humans, listed in order of Recommended Dietary Allowance (expressed as a mass), are potassium, chlorine, sodium, calcium, phosphorus, magnesium, iron, zinc, manganese, copper, iodine, chromium, molybdenum, selenium and cobalt (the last as a component of vitamin B). There are other minerals which are essential for some plants and animals, but may or may not be essential for humans, such as boron and silicon . </P> <P> Conditionally essential nutrients are certain organic molecules that can normally be synthesized by an organism, but under certain conditions in insufficient quantities . In humans, such conditions include premature birth, limited nutrient intake, rapid growth, and certain disease states . Choline, inositol, taurine, arginine, glutamine and nucleotides are classified as conditionally essential and are particularly important in neonatal diet and metabolism . </P> <P> Non-essential nutrients are substances within foods that can have a significant impact on health; these substances can be beneficial or toxic . For example, dietary fiber is not absorbed in the human digestive tract, but is important in maintaining the bulk of a bowel movement to avoid constipation . A subset of dietary fiber, soluble fiber, can be metabolized by bacteria residing in the large intestine . Soluble fiber is marketed as serving a prebiotic function--promoting "healthy" intestinal bacteria . Bacterial metabolism of soluble fiber also produces short - chain fatty acids like butyric acid, which may be absorbed into intestinal cells as a source of calories . </P> <P> Ethanol (C H OH) supplies calories . For spirits (vodka, gin, rum, etc .) a standard serving in the United States is 1.5 US fluid ounces (44 ml), which at 40% ethanol (80 proof) would be 14 grams and 98 calories . At 50% alcohol, 17.5 grams and 122.5 calories . Wine and beer contain a similar amount of ethanol in servings of 5 US fluid ounces (150 ml) and 12 US fluid ounces (350 ml), respectively, but these beverages also contain non-ethanol calories . A 5 - ounce serving of wine contains 100 to 130 calories . A 12 - ounce serving of beer contains 95 to 200 calories . According to the U.S. Department of Agriculture, based on NHANES 2013--2014 surveys, women ages 20 and up consume on average 6.8 grams of alcohol per day and men consume on average 15.5 grams per day . Ignoring the non-alcohol contribution of those beverages, the average ethanol calorie contributions are 48 and 108 cal / day, respectively . Alcoholic beverages are considered empty calorie foods because, other than calories, they contribute no essential nutrients . </P>

What is consumed by humans that provides energy but is not an essential nutrient
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