The composition of food can vary widely, depending, among other factors, on the variety of plant or animal, on growing and feeding conditions and, for some foods, on freshness. Food tables are based on average values from a number of samples analysed in the laboratory and therefore only provide a rough guide. Because of the errors mentioned above it is likely that there will be an error of ±10%
On most products nutritional information is provided on the product packaging. The following is an example of the nutritional information provided on a packet of rice:
The packaging may also include the recommended Guideline Daily Amount (GDA) that we should consume:
So what does the information tell us?
The above product information tells us that every 100g of rice contains 2.4g of protein, 2.9g of fat, 20.5g of carbohydrate and you will consume 118 calories which is 5.9% of GDA for women and 4.7% of GDA for men.
USDA National Nutrient Database
For up to date nutritional information search the USDA National Nutrient Database, Release 24 online.
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