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Nutrient Data Laboratory - Frequently Asked Questions
I’m looking for dietary advice. Can you tell me which foods are best for me to eat?
NDL does not provide any kind of dietary advice. We recommend nutrition counseling by a qualified professional. The American
Dietetic Association maintains a service to find a Registered Dietitian in your area. Other resources include your local dietetic
association, health department or hospital.
Where can I get information on Dietary Supplements?
USDA's Food and Nutrition Information Center has compiled a list of resources on Dietary Supplements. In collaboration with
NIH's Office of Dietary Supplements, they have prepared a bibliographic database of international, scientific literature on dietary
supplements, including vitamins, minerals, and botanicals.
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Where can I get information on nutrition?
, a new federal resource, provides easy access to all online federal government information on nutrition.
This national resource makes obtaining government information on nutrition, healthy eating, physical activity, and food safety, easily
accessible in one place for many Americans. USDA's Food and Nutrition Information Center has compiled a wide variety of links to
food and nutrition resources on the Internet. Some of the resources they have developed contain information on food allergies, food,
labeling, food safety, dietary guidance, dietary supplements, nutrition and cancer, vegetarian nutrition and many more. USDA's
Center for Nutrition Policy and Promotion also has information on the Dietary Guidelines, the Food Guide Pyramid, preparing
nutritious meals and the Healthy Eating Index as well as other nutrition information. The American Dietetic Association also has a
variety of nutrition information on their Web site.
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Do you have a copy of the RDAs on your Web site?
In 1996 the Food and Nutrition Board, Commission on Life Sciences, National Research Council began developing Daily Reference
Intakes (DRIs) to replace the Recommended Dietary Allowances (RDAs). These new DRIs are published by the National Academy
Press. Copies of the RDA and DRI tables are available on the National Agricultural Library's Food and Nutrition Information
Center's Web site
In 1973 the FDA developed the U.S. RDA system to replace the minimum daily requirements which had previously been used for
nutrition labeling purposes. The U.S. RDAs were based on the Food and Nutrition Board’s RDAs, but were not identical to them.
The Daily Values (DV) used on current nutrition labels are based on the U.S. RDAs and can be found in the Code of Federal
Regulations, Title 21, Part 101.9.
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What is the difference between calories and kilocalories?
In the U.S., energy in foods is expressed in kilocalories (kcal). The scientific definition of a kilocalorie is the amount of energy
needed to raise the temperature of 1 kilogram of water one degree Celsius from 15° to 16° at one atmosphere. The true calorie,
sometimes referred to as a "small calorie," is the amount of energy needed to raise the temperature of one gram of water one degree
Celsius from 15° to 16° at one atmosphere. A kilocalorie is equal to 1000 calories. While the term "calorie" technically applies to the
"small calorie," in common usage, such as in reference to food energy, the term "calorie" is actually a kilocalorie. Internationally,
most countries express food energy in kilojoules (kJ). One kcal equals 4.184 kJ. The USDA Nutrient Database for Standard
Reference contains values for both kilocalories and kilojoules.
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