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Add RestrictedDiet enums to match GS1 DietTypeCode, add example #4666#4682

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issue_4666
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Add RestrictedDiet enums to match GS1 DietTypeCode, add example #4666#4682
alex-jansen wants to merge 1 commit intomainfrom
issue_4666

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@alex-jansen
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@alex-jansen alex-jansen commented Jan 12, 2026

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@alex-jansen alex-jansen mentioned this pull request Jan 12, 2026
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fthobe commented Jan 14, 2026

Hey, I made a complete list of what's already present and what not.
Can I make a PR against your branch with the missing diet types? Add this point it might also be worth the discussion adding it to product (as it it's used by GS1 to indicate compliance of a food product with a diet).

@alex-jansen what do you think?

OK = already present
#4682 = added in your PR

Status Code value Name Description
#4682 COELIAC Coeliac Denotes a product that can be safely consumed by a person with coeliac disease. Coeliac disease is caused by a reaction to gladin (a gluten protein found in wheat) and similar proteins found in other crops.
OK DIABETIC Diabetic Denotes a product that intends to decrease the need for insulin or oral diabetic agents by adjusting caloric and carbohydrate intake.
#4682 DIETETIC Dietetic Denotes a product that is specially prepared or processed for people on restrictive diets.
FODMAP Low FODMAP diet The low Fermentable Oligosaccharides Disaccharides Monosaccharides And Polyols (FODMAP) diet is a specialized dietary plan designed to help individuals manage symptoms of irritable bowel syndrome (IBS) and other functional gastrointestinal disorders. FODMAP are poorly absorbable short-chain carbohydrates and sugar alcohols that can be found in various everyday food products (such as various fruits and vegetables, honey, milk, and sweeteners).
OK FREE_FROM_GLUTEN Free From Gluten Denotes a product that can be used in a gluten free diet, as specified by the appropriate authority within a target market.
GRAIN_FREE Grain free Indicates that the product is suitable for a grain-free diet that eliminates all grains, including wheat, spelt, barley, rye, dried corn, millet, rice, and oats, as well as foods — and sometimes even ingredients — derived from them.
OK HALAL Halal Denotes selling or serving food ritually fit according to Islamic dietary laws.
HIGH_CARB High Carb High Carb is not a fast diet but much more a complete diet. "High Carb" means that most of the calories in your daily diet come from carbohydrates. At the same time, it is also a low fat diet because the fat content in the diet is relatively low.
HIGH_PROTEIN High Protein Indicates that the product is suitable for a protein-defined diet in which protein foods are dominant, calories are low, carbohydrates are largely avoided and fat is avoided to a limited extent.
INFANT_FORMULA Infant Formula Infant formulas come in powder, liquid concentrate, and ready-to-feed forms. Infant formulas come in a variety of types: Cow's milk formula is the most commonly used type. The milk has been altered to resemble breast milk. Soy protein based formulas are frequently used for infants allergic to cow's milk or lactose.
KETO Keto A ketogenic diet is a form of low carb diet. It is characterized by an extremely low carbohydrate and very high-fat diet. Due to the lack of carbohydrates, the metabolism changes and gets into the so-called "ketosis".
OK KOSHER Kosher Denotes selling or serving food ritually fit according to Jewish dietary laws.
LACTASE_ENZYME Lactase Enzyme This product is an enzyme supplement used to help people who have trouble digesting milk and other dairy products (lactose intolerance). Lactase enzyme is normally produced by the body to help break down (digest) lactose.
LACTOSE_FREE Lactose free Indicates that the product is suitable for a those with an intolerance to lactose as the product does not contain the lactose sugar that is normally found in a dairy product.
OK LOW_CALORIE Low calorie Indicates that the product is suitable for a calorie-defined diet in which the calorie intake is restricted.
LOW_CARB Low Carb Low-carb diets restrict carbohydrate consumption. Foods high in carbohydrates (e.g., sugar, bread, pasta) are limited or replaced with foods containing a higher percentage of fats and moderate protein (e.g., meat, poultry, fish, shellfish, eggs, cheese, nuts, and seeds) and other foods low in carbohydrates (e.g., most salad vegetables such as spinach, kale, chard, and collards), although other vegetables and fruits (especially berries) are often allowed.
OK LOW_FAT Low Fat A low-fat diet is one that restricts fat and often saturated fat and cholesterol as well. Low-fat diets are intended to reduce the occurence of conditions such as heart disease and obesity.
LOW_PROTEIN Low protein Indicates that the product is suitable for a protein-defined diet in which the protein intake with food is restricted.
OK LOW_SALT Low salt Indicates that the product is suitable for a salt-defined diet in which the salt intake with food is restricted.
MEAL_REPLACEMENT Meal Replacement A calorie-controlled, pre-packaged product in the form of a bar or a beverage (ready-to-drink or powder) that is used to replace a meal.
MOTHERS_MILK_SUBSTITUTE Mothers Milk Substitute The item is approved as substitute mother's milk by the appropriate authority of the target market.
NUTRITION_SUPPLEMENT Nutrition Supplement Nutritional supplements are any dietary supplement that is intended to provide nutrients that may otherwise not be consumed in sufficient quantities; for example, vitamins, minerals, proteins, amino acids or other nutritional substances.
#4682 ORGANIC Organic Denotes a food product that was produced with the use of feed or fertiliser of plant or animal origin, without employment of chemically formulated fertilisers, growth stimulants, antibiotics or pesticides.
PALEO Paleo Paleo diet is a fad diet type requiring the sole or predominant eating of foods presumed to have been available to humans during the Paleolithic era.
PESCATARIAN Pescatarian A pescatarian diet excludes meat and poultry but includes fish or seafood (and may include dairy products and eggs).
PLANT_BASED Plant based A plant-based diet is a way of eating that focuses on vegetables fruits, whole grains, legumes (beans, peas, and lentils), nuts and seeds. (i.e. foods that come from plants. It is not a vegan/vegetarian diet that avoids animal products, but it de-emphasizes animal products and its contribution to our meals).
POLLOTARIAN Pollotarian A pollotarian diet, also known as a pollo-vegetarian diet, incorporates poultry, including turkey and duck, as the only source of meat in an otherwise vegetarian diet.
PROBIOTICS Probiotics Probiotics are live bacteria and yeasts that are good for you, especially your digestive system.
RAW Raw food diet A dietary practice of eating food that is uncooked and unprocessed. Also known as Raw foodism, rawism.
TOTAL_DIET_REPLACEMENT Total Diet Supplement Dietary supplements include vitamins, minserals, herbs, botanicals, enzymes, amino acids, or other dietary ingredients. You take these products by mouth in pill, capsule, tablet, or liquid form to replace your diet.
OK VEGAN Vegan Products that are not of animal origin and at no stage of production and processing has use been made of, or the product been supplemented with ingredients or processing aids or substances that are of animal origin. The product has not been tested on animals. Local regulations, where they exist, prevail since the term may be a combination or all of the above statements.
OK VEGETARIAN Vegetarian Denotes a product that contains no meat or other animal products but depending upon the local market regulations may also contain milk, eggs, products from bees (and in some markets also fish), and their components. Please refer to local regulations.
#4682 WITHOUT_BEEF Without beef Denotes a product that contains no beef or beef-products. Beef is considered to be a taboo food product by some religions most notably Hinduism, Buddhism and Jainism.
#4682 WITHOUT_PORK Without pork Denotes a product that contains no pork meat.

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alex-jansen commented Jan 14, 2026

@fthobe I got the impression from this comment that we only wanted to add the few missing ones that are defined by GS1 and not add a large set of others, since there are so many different diets? Others (such as FODMAP illustrated in my example) can be added using the Diet type.

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fthobe commented Jan 14, 2026 •
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Update
May 2025 GS1 harmonized all diets

This is the complete list is Sweden covering all available 34 codes (updated in 2025):

https://gs1.se/en/guides/documentation/code-lists/t4066-diet-type-code/

Every country has it's own list, same code, same meaning, but not all codes for all countries.

All countries now share the same list. Another example is Germany: https://gdsn.gs1-germany.de/codeList?id=DietTypeCode (also updated last time 2025)

I would consider to support this also for products to cover (convenience) food.

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fthobe commented Jan 16, 2026

@philarcher there seems to be a rather short list on DietTypeCode on gs1.org while there are more extensive lists on literally every country I looked on updated recently like in Sweden and Germany. I believe the gs1.org codes have not been updated or are maybe incomplete. Is there any matrix of which values apply to which countries if they differ by country?

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alex-jansen commented Jan 19, 2026

This discussion provides more support for the original suggestion to add DefinedTerm to the range of suitableForDiet. That way any external defined enumeration or code list can be referenced. That would be better than just copying over enum values, which change over time. Example:

suitableForDiet: {
	"@type": "DefinedTerm",
	"inDefinedTermSet": "https://gs1.se/en/guides/documentation/code-lists/t4066-diet-type-code/",
	"termCode": "FODMAP",
	"name": "low FODMAP diet"
}

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fthobe commented Jan 21, 2026

Fine, I do believe that this has some great potential regarding shopping and recipes but I can see resistance is strong here. I'd implement the gs1 list also because it proofed to be immensely stable (two changes in 10 years) and retailers do have the data and I feel adoption with an external vocabulary was always lower given the implications of having to either hardcode them into templates or having to add DB schemas in a manor that is more invasive as most eCommerce systems have custom attributes (also filterable), but those usually do not support external links (more like a "Color" : "Red" or "Diet" : "Keto" than a fully fledged json array in the backend).

Having worked a lot in the past on structured data on the data providing side, I feel this makes a relatively limited problem a large implementation effort on content side.

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alex-jansen commented Jan 21, 2026

Sure @fthobe please send a PR with the missing enums and happy to merge them in since ultimately it is not a major risk or breaking change.

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fthobe commented Jan 21, 2026 •
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Thanks :) How should I handle the fact that they seem universally available across all EU countries, but not present on gs1.org?

E.g.
See also [gs1:DietTypeCode-FODMAP](https://ref.gs1.org/voc/DietTypeCode-FODMAP)
would be a broken link here.

@philarcher
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philarcher commented Jan 21, 2026

Hang on, we (GS1) might be able to help :-) I'll get someone on to this thread who can.

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fthobe commented Jan 21, 2026

Hang on, we (GS1) might be able to help :-) I'll get someone on to this thread who can.

My hero without cape ;)

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fthobe commented Jan 21, 2026 •
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@philarcher can you push all 34 values supported into v3.1.35? It seems like all values are unique.
GS1 Sweden and Germany seem to have the full list of 34 items and no breaking changes.

@IvoLadeniusGs1
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IvoLadeniusGs1 commented Jan 23, 2026

@fthobe @alex-jansen
We are working on this from the GS1 side and will provide an update once this has been clarified and addressed.

I am a direct colleague of Phil and will support him on GS1-related topics in discussions like this where possible.

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fthobe commented Jan 23, 2026 •
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@alex-jansen how about we merge this and keep the discussion in the issue #4666? I can always add the remaining items from gs1 later.

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