Question: When was the nutrition facts label first required by law in the U.S.?

Nutrition facts label


The nutrition facts label (also known as the nutrition information panel, and other slight variations) is a label required on most packaged food in many countries.  Most countries also release overall nutrition guides for general educational purposes. In some cases, the guides are based on different dietary targets for various nutrients than the labels on specific foods.
Nutrition facts labels are only one of many types of food label required by regulation or applied by manufacturers.
Australia and New Zealand
Australia and New Zealand use a nutritional information panel of the following format:

Other items are included as appropriate, and the units may be varied as appropriate (e.g. substituting ml for g, or mmol for mg in the 'Sodium' row).[2] In April 2013 the New Zealand government introduced rules around common claims made on food packaging, such as 'low in fat'.[3]
Canada


In Canada,  a standardized "Nutrition Facts" label was introduced as part of regulations passed in 2003, and became mandatory for most prepackaged food products on December 12, 2005.  (Smaller businesses were given until December 12, 2007 to make the information available.).[4] In accordance with food packaging laws in the country, all information, including the nutrition label, must be written in both English and French, the country's two official languages.[5]
Canadian regulation tightly controls the manner in which the nutrition fact table (NFT) data are laid out. There is a wide variety of possible formats for use on a given food package. A selection hierarchy is used to select among the many formats (28 main formats, and 2-7 sub formats for each). This results in standard (vertical) formats being considered for use before horizontal and linear formats. The selection hierarchy also allows the NFT to occupy no more than 15% of the physical package's available display area (ADS), but never to be smaller than a format that would be <=15% of ADS. In practice, determining the ADS of a package, and selecting the appropriate NFT format, can be a detailed calculation.
China
In 2011 the Chinese Ministry of Health released the National Food Safety Standard for Nutrition Labeling of Prepackaged Foods (GB 28050-2011). The core nutrients that must be on a label are: protein, fat, carbohydrate and sodium. Energy is noted in kJ. And all values must be per 100g/100ml.,[6][7]
European Union


It was regulated by the Commission Directive 2008/100/EC of 28 October 2008 amending Council Directive 90/496/EEC on nutrition labelling for foodstuffs as regards recommended daily allowances, energy conversion factors and definitions.[8] A new regulation is now in force (Regulation 1169/2011).[9] Nutritional labelling becomes mandatory for most pre-packaged foods as from December 2016.
In the European Union, along the "old" rules (Directive 90/496, amended), the information (usually in panel format) is most often labelled "Nutrition Information" (or equivalent in other EU languages). An example is shown on the right. The panel is optional, but if provided, the prescribed content and format must be followed. It will always give values for a set quantity— 100g (3.5oz) or 100ml (3.5impfloz; 3.4USfloz) of the product— and often also for a defined "serving", as an option. First will come the energy values, in both kilocalories and kilojoules.
Then will come a breakdown of constituent elements: usually most or all of protein, carbohydrate, starch, sugar, fat, fibre and sodium. The "fat" figure is likely to be further broken down into saturated and unsaturated fat, while the "carbohydrate" figure is likely to give a subtotal for sugars. With the "new" rules, the mandatory information is: energy, fat, saturates, carbohydrates, sugars, protein and salt, in that particular order, with options to extend this list to: mono-unsaturates, polyunsaturates, polyols, starch, fibre, and vitamins and minerals.[9]
With regards to health claims and nutrition (composition) claims, these are harmonised in the EU through Regulation 1924/2006, amended.[10] In November 2012, the European Commission published two new regulations: Regulation (EC) No. 1047/2012 and Regulation (EC) No.1048/2012.
Certain nutrition claim groups as of Regulation (EC) No 1924/2006 had to be changed. Moreover, the health claims associated to barley beta-gluten were amended (e.g. lowering  blood cholesterol).[11][12]
Within Regulation 1924, there are legal definitions of terms such as "low fat", "high fibre", "reduced calories".[10]
All health claims have been harmonised in the European Union. They can be used if they have been approved by EFSA. The list of approved and rejected claims is available on a web site.[13]
Provided the full nutrition information is shown on the packet, additional nutritional information and formats (e.g. a traffic light rating system) may be included and this falls outside the scope of regulation.
The United Kingdom regulations are given in Schedules 6 and 7 of the Food Labelling Regulations 1996.[14]

Hong Kong
In Hong Kong nutrition facts labels are regulated by the subsidiary legislation Food and Drugs (Composition and Labelling) (Amendment: Requirements for Nutrition Labelling and Nutrition Claim) Regulation 2008.[15]
India
The Ministry of Health and Family Welfare had, on September 19, 2008, notified the Prevention of Food Adulteration (5th Amendment) Rules, 2008, mandating packaged food manufacturers to declare on their product labels nutritional information and a mark from the  F.P.O or Agmark (Companies that are responsible for checking food products) to enable consumers make informed choices while purchasing.[16] Prior to this amendment, disclosure of nutritional information was largely voluntary though many large manufacturers tend to adopt the international practice.[17]
Mexico
Food products sold in Mexico use the NOM-051-SCFI-1994 "Información nutrimental" product labelling standard, very similar to "Nutrition Facts" in the US. The Official Mexican Standard, or NOM (Norma Oficial Mexicana), was developed by the Mexican Secretary of Commerce and Industrial Promotion (Secretaría de Comercio y Fomento Industrial), now a part of the Secretary of the Economy (SECOFI). It entered into effect on January 24, 1996[18] and defines "General specifications for labelling foods and pre-bottled non-alcoholic beverages."[19]
United States
Description
In the United States, the Nutritional Facts label lists the percentage supplied that is recommended to be met, or to be limited, in one day of human nutrients based on a daily diet of 2,000 calories.
With certain exceptions, such as foods meant for babies, the following Daily Values are used.[20] These are called Reference Daily Intake (RDI) values and were originally based on the highest 1968 Recommended Dietary Allowances (RDA) for each nutrient in order to assure that the needs of all age and sex combinations were met.[21] These are older than the current Recommended Dietary Allowances of the Dietary Reference Intake. For vitamin C, vitamin D, vitamin E, vitamin K, calcium, phosphorus, magnesium, and manganese, the current highest RDAs are up to 50% higher than the older Daily Values used in labeling, whereas for other nutrients the recommended needs have gone down. A side-by-side table of the old and new adult Daily Values is provided at Reference Daily Intake. As of October 2010, the only micronutrients that are required to be included on all labels are vitamin A, vitamin C, calcium, and iron.[22] To determine the nutrient levels in the foods, companies may develop or use databases, and these may be submitted voluntarily to the U.S. Food and Drug Administration for review.[23]

Additionally, there is a requirement for ingredients to be listed in order from highest to lowest quantity, according to their weight.

The label was mandated for most food products under the provisions of the 1990 Nutrition Labeling and Education Act (NLEA), per the recommendations of the U.S. Food and Drug Administration.[24]  It was one of several controversial actions taken during the tenure of FDA Commissioner Dr. David Kessler. The law required food companies to begin using the new food label on packaged foods beginning May 8, 1994. (Meat and poultry products were not covered by NLEA, though the U.S. Department of Agriculture proposed similar regulations for voluntary labeling of raw meat and poultry.[25])  Foods labeled before that day could use the old label. This appeared on all products in 1995. The old label was titled "Nutrition Information Per Serving" or simply, "Nutrition Information".
The label begins with a standard serving measurement, calories are listed second, and then following is a breakdown of the constituent elements. Always listed are total fat, sodium, carbohydrates and protein; the other nutrients usually shown may be suppressed, if they are zero. Usually all 15 nutrients are shown: calories, calories from fat, fat, saturated fat, trans fat, cholesterol, sodium, carbohydrates, dietary fiber, sugars, protein, vitamin A, vitamin C, calcium, and iron.
Products containing less than 5g of fat show amounts rounded to the nearest 0.5g. Amounts less than 0.5g are rounded to 0g. For example, if a product contains 0.45g of trans fat per serving, and the package contains 18 servings, the label would show 0g of trans fat, even though the product actually contains a total of 8.1g of trans fat.
In addition to the nutrition label, products may display certain nutrition information or health claims on packaging. These health claims are only allowed by the FDA for "eight diet and health relationships based on proven scientific evidence", including: calcium and osteoporosis, fiber-containing grain products, fruits and vegetables and cancer, fruits, vegetables, and grain products that contain fiber—particularly soluble fiber—and the risk of coronary heart disease, fat and cancer, saturated fat and cholesterol and coronary heart disease, sodium and hypertension, and folate and neural tube defects.[26] The Institute of Medicine recommended these labels contain the most useful nutritional information for consumers: saturated fats, trans fats, sodium, calories, and serving size.[27] In January 2011, food manufacturers and grocery stores announced plans to display some of this nutrition information on processed food.[28]
The nutrition facts label currently appears on more than 6.5 billion food packages. President Bill Clinton issued an award of design excellence for the nutrition facts label in 1997 to Burkey Belser in Washington, DC.[29]
The FDA does not require any specific typeface be used in the Nutrition Facts label, mandating only that the label "utilize a single easy-to-read type style",[30] though its example label uses Helvetica.[31] However, as regulated by the FDA and the USDA, it is mandatory for certain information listed in the label to be written in English, including: name of the product, net quantity, serving size and number of servings per package, nutrition facts, ingredient list, and name of manufacturer or distributor.[32] The smallest lettering should be at least 1/16th of an inch tall (1.5875 millimeters), based on the height of a lowercase "o".[33]
In January 2006, Trans fat was required to be listed under saturated fat. This was the first significant change to the Nutrition Facts panel since it was introduced in 1993.[34]
2016 revision
In 2014, the U.S. Food and Drug Administration proposed several simultaneous improvements to nutrition labeling for the first time in over 20 years.[35][36] The proposed changes were based on trends of consumption of nutrients of public health importance.[37] However, studies had shown that the majority of the U.S. population could not understand the information in the then current Nutrition Facts Label.[38] Nutrition label numeracy is particularly low in older individuals, of black and Hispanic race/ethnicity, who are unemployed, born outside of the US, have lower English proficiency, lower education achievement, lower income, or live in the South.[39]
Proposed changes included a new design requiring serving sizes to more accurately reflect how many servings the average individual is actually consuming. The new recommendation also proposed removing “calories from fat”, and instead focusing on total calories and type of fats being consumed in a product. The proposed labels were to also list how much sugar is added (rather than inherent) to a product, as well as declaring the amount of Vitamin D and potassium in a product.[35][40] Some of these changes sparked a major debate between the food industry and public health agencies. The proposal to indicate sugar added during food production, in particular, was brought forward by the FDA as a measure to counter the increase in per capita sugar consumption in the US, which over the last decades exceeded the limits recommended by scientific institutions and governmental agencies.[41][42] Major American food associations opposed the label change, indicating "lack of merit" and "no preponderance of evidence" to justify the inclusion of sugar added in the new label.[43][44]
The rules for the new design were finalized on May 20, 2016.  Manufacturers were initially given until July 26, 2018 to comply (or July 26, 2019 if they have less than $10 million in annual food sales).[45] A proposed rule by the FDA would extend the compliance deadline to January 1, 2020 (or January 1, 2021 for qualified small business).[46] For food and dietary supplement labeling purposes the amounts of vitamins and nutritionally essential minerals in a serving are expressed as a percent of Daily Value (%DV).  Many of the definitions of 100% Daily Value were changed as part of the revision.[47] A table of the old and new adult Daily Values is provided at Reference Daily Intake.
Alcohol
In the United States, alcoholic beverages are regulated by the Alcohol and Tobacco Tax and Trade Bureau (TTB). As of 2012, the TTB does not require alcoholic beverage packaging to have a nutrition facts label. Since at least 2003, consumer groups have lobbied the TTB to require labelling disclosing Nutrition Facts information.[48] Some marketing terms, such as "light" and "table wine", must follow TTB guidelines. Packaging must disclose alcohol content in some circumstances.[48]
Mandatory information on the label varies by type of beverage, and includes:[49][50][51][52]
Brand name
Name and address of manufacturer (either bottling plant or main headquarters)
Country of origin if imported (required by U.S. Customs and Border Protection regulations)
Class, the definitions of which are regulated (e.g. beer, ale, lager, gin, vodka, rum, tequilla, cordial, liqueurs)
Health warning for beverages 0.5% or more alcohol by volume
Net contents
For malt beverages, must be in United States customary units (e.g. pints or fluid ounces)
For distilled spirits, must be in metric units.  Bottles must be 50 mL, 100 mL, 200 mL, 375mL, 750 mL, 1 L, or 1.75 L. Bottles must be 50 mL, 100 mL, 200 mL, or 355 mL.
For wine, must be in metric units, and bottles must be 50 mL, 100 mL, 187 mL, 375 mL, 500 mL, 750 mL, 1L, 1.5 L, 3 L, or a larger size with an even number of liters.
Alcohol content (percent by volume):
For malt beverages, mandatory only if some alcohol is due to added flavors, or if required by state law
For distilled spirits, mandatory
For wine, optional
Declaration of sulfites required for wine sold in interstate (not intrastate) commerce if 10 ppm or more of sulfur dioxide
Optional but regulated terms:
For malt beverages: "draft", "light", "low-carbohydrate"
For wine: grape variety and appellation of origin, wine designation (e.g. "white", "red", "rose", "table"), viticultural area, "estate bottled, "vinted", vintage date
"Organic" (regulated by USDA)
Declarations for major allergens
Caffeine
Health researchers have called for the mandatory labelling of food products with added caffeine, which is a psychoactive nervous system stimulant. If over-consumed, caffine can cause seizures, kidney problems, liver problems, heart arrhythmia, and death.[53] The Coca-Cola Company and PepsiCo began labelling caffeine content in 2007.[54]
See also
Diet (nutrition)
Food energy
List of food labeling regulations
Table of food nutrients
Nutritional scale
Serving size
Atwater system (for calculating available food energy)
The Non-GMO Project
Quack Miranda warning





US Food and Drug Administration Center for Food Safety and Applied Nutrition: 
Health Canada: 
U.K. Food Standards Agency: 
 (The actual text of the labeling regulation in the U.S.)