Key Takeaways
- A vegetarian or vegan diet asks a food app two questions at once. Is there an animal in this, item by item. And did the week still cover the nutrients that used to arrive with the animal. Most trackers are built to answer neither.
- The allergen line answers part of the first question and only part. Four of the nine major food allergens that must be declared in the United States are animal foods: milk, eggs, fish and Crustacean shellfish. Meat, gelatin, rennet, carmine and animal-derived flavourings are not allergens and trigger nothing.
- Federal labelling rules let flavourings and colourings travel under collective names. The regulations define "natural flavor" as flavouring constituents that may be derived from meat, seafood, poultry, eggs or dairy products, and the label never has to say which one it was.
- Carmine is the exception that proves the rule. Since 2009 the regulation requires food labels to name "cochineal extract" or "carmine" specifically. Almost nothing else animal-derived is named that plainly.
- The nutrients this diet moves are the ones the Nutrition Facts panel is not required to carry. Vitamin D, calcium, iron and potassium are mandatory. Vitamin B12, zinc and iodine are not. An app that fills its micronutrient screen from label data is missing exactly the numbers a vegan needs to watch.
The question usually arrives in one line. I have gone vegetarian, or I have gone vegan, what should I put on my phone. It sounds like a diet question and it is not, because you are not trying to land near a number by bedtime. You are doing two different jobs at once. In the aisle you are answering a yes or no about a single jar. At the end of the week you are answering something slower and quieter: did any of this actually contain vitamin B12.
Almost every food app on the shelf is a calculator, and a calculator is built for the second job only, badly, using data that was never collected for it. This page does not rank apps. Rankings go stale in a season and the right pick depends on where you personally draw the line, which is a decision no reviewer can make for you. What follows stays true longer: what a label is legally required to name, what it is allowed to hide behind a generic word, which four numbers change when animal foods leave the plate, a checklist you can run inside an app store in a few minutes, and a seven-day test you can run on whatever is already installed.
Two questions, not one
A calorie tracker is a device for approaching a number from one side. Every design decision follows from that: a daily budget, a bar that fills, a total that resets at midnight. A vegetarian or vegan day is a different shape, and it is a different shape twice over.
| What a calorie app is built around | What a vegetarian or vegan day is actually made of |
|---|---|
| One target you get close to by evening | A separate verdict for every item in the basket, plus a target you only see over a week |
| A wrong entry moves a total by a little | A wrong entry is the one thing the log existed to catch |
| You log after eating | You need the exclusion answer before eating, in the shop or at the counter |
| Portion size is the variable that matters | The ingredient list, the enzyme and the flavouring are the variables that matter |
| A food is a row of numbers | A food is an ingredient list, a process and a supply chain |
| The nutrients on screen are the ones on the label | The nutrients at risk are mostly the ones the label is not required to print |
None of this makes a tracker useless. It means the work has moved, and the app worth keeping is the one that moved with it.
What the label must name, and what it may hide
Most confusion about vegan apps is really confusion about labels, so it is worth having the rules in front of you before you judge any software. Three of them do most of the damage.
The allergen list is short and it was never an animal list. The FDA states the current set plainly: the major food allergens are milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame. Four of those nine are animal foods. Beef, pork, chicken, gelatin, rennet, honey and every animal-derived additive are not on the list at all, so nothing about them is flagged in a "contains" statement.
Flavourings and colourings get to use collective names. The general rule in the ingredient regulation is that the name of an ingredient shall be a specific name and not a collective (generic) name, and then it carves out an exception for spices, flavourings, colourings and chemical preservatives. Follow that exception through and you land on the definition of the term itself: "natural flavor" means the essential oil, oleoresin, essence or extractive, protein hydrolysate, distillate, or any product of roasting, heating or enzymolysis, which contains the flavoring constituents derived from a spice, fruit or fruit juice, vegetable or vegetable juice, edible yeast, herb, bark, bud, root, leaf or similar plant material, meat, seafood, poultry, eggs, dairy products, or fermentation products thereof. Meat, seafood, poultry, eggs and dairy are inside that definition. Two words on a pack, and the source is not disclosed.
One animal ingredient is required to be named, which tells you how the rest behave. The colour additive cochineal extract is, in the regulation's own words, obtained from an extract of cochineal (Dactylopius coccus costa), an insect. Since a 2009 amendment, the label of food products containing it shall specifically declare the presence of the color additive by listing its respective common or usual name, "cochineal extract" or "carmine". That rule exists because of allergy, not because of diets: the final rule states that it responds to reports of severe allergic reactions, including anaphylaxis. And it is close to unique. If you have been wondering why carmine is the one animal ingredient that shows up in plain sight, that is why.
Two more definitions are worth knowing by heart, because they turn two common words into settled answers.
Gelatin. Federal regulation defines it directly, and the wording below is the regulation's own, repeated word slip included: "gelatin means a product that has been obtained by the partial hydrolysis of collagen derived from hides, connective tissue, and/or bone bones of cattle and swine". There is no ambiguity to resolve and no manufacturer to email.
Rennet. The regulation is equally blunt about where it comes from: rennet is the aqueous extract prepared from cleaned, frozen, salted, or dried fourth stomachs (abomasa) of calves, kids, or lambs. The same section describes chymosin preparation as a fermentation-derived alternative, which is why some cheese is acceptable to a lacto-vegetarian and some is not. The standard of identity for cheddar cheese permits rennet and/or other clotting enzymes of animal, plant, or microbial origin, and separately permits enzymes of animal, plant or microbial origin used in curing or flavour development. The pack may say "enzymes" and stop there.
Put those together and you get a table your app should behave according to.
| What you see on the pack | What it actually means | What an app should do with it |
|---|---|---|
| "Contains: milk" or "Contains: egg" | A major food allergen, declared because the law requires it | A stop for a vegan, an ordinary ingredient for a lacto-ovo vegetarian. The app should know which of those you are |
| No "contains" statement at all | Nothing about meat, poultry, gelatin, honey, carmine or animal-derived flavouring, none of which are allergens | Send you to the ingredient list, never return a green verdict |
| "Natural flavor" | The regulation permits constituents derived from meat, seafood, poultry, eggs or dairy products, undisclosed | Mark the entry unknown rather than plant-based, and keep the flag visible |
| "Enzymes" in a cheese | The cheddar standard permits clotting enzymes of animal, plant or microbial origin | Let you record which one, or record that you asked and what you were told |
| "Carmine" or "cochineal extract" | A colour obtained from an insect, required by regulation to be named | A stop, and a reminder that the rest of the list is nowhere near this explicit |
| "Gelatin" | Collagen from hides, connective tissue and bones of cattle and swine, by federal definition | A stop, with no further research needed |
| "Mono- and diglycerides" | The regulation says they are prepared from fats or oils derived from edible sources. It does not say plant sources, and the ingredient name is identical either way | Unknown, not safe. Store the manufacturer's answer with the date you got it |
| A vegan certification logo | That certifier's own standard, which is not a federal definition of anything | Record which certifier, because different logos mean different lines |
| A dish in a restaurant | There is no label, and the person answering may not have asked the kitchen | Record what you were told and by whom. No database can verify a stockpot |
The allergen line is not an animal-ingredient line
This is the single most common way a food app gets a vegan user in trouble, and it is a structural mistake rather than a bug. Apps inherit allergen data from product databases, and that data is built on a list of nine allergens that happens to include four animal foods. Filter on it and you get something that looks like a plant-based filter and behaves like a dairy-and-egg filter.
The gap is easy to describe. Milk, eggs, fish and Crustacean shellfish are caught, because the law requires their source to be declared. Beef, pork, lamb and chicken are not allergens, so a beef-derived ingredient sets off nothing. Gelatin is not an allergen. Rennet is not an allergen. Honey is not an allergen. Carmine must be named, but it is named as a colour, not as an allergen, so a filter reading the allergen field alone will miss it too. Animal-derived flavour constituents sit behind two permitted words and are invisible to every automated check ever written.
The four numbers that change when animal foods leave
The exclusion question is the loud one. The nutrient question is the quiet one. It shows up long after the switch, and it is the reason a tracker is worth having at all on this diet. Four numbers move, and they move for reasons that are documented rather than argued about.
Vitamin B12 does not come from plants. The Institute of Medicine's reference intake review states it without hedging: because B12 is not a component of plant foods, diets containing little or no animal food may lead to B12 deficiency. The RDA for adults is 2.4 micrograms per day. The same chapter notes that crystalline B12 appears in the diet only in foods that have been fortified with B12, such as breakfast cereals and liquid meal replacements, and it is candid about the foods vegans are most often told to rely on: accurate data are not available for some of them, certain algae included, so it is not clear what B12 content should be assumed. If your app is crediting you with B12 from a seaweed entry, it is reporting a number the reference literature declines to stand behind.
Iron changes its exchange rate. The same programme of reports works the arithmetic through in the iron chapter: the bioavailability of iron from a vegetarian diet is approximately 10 percent, rather than the 18 percent from a mixed Western diet. Hence the requirement for iron is 1.8 times higher for vegetarians. That is not a rounding error. It means an intake that fills the iron bar on a mixed diet covers a little over half of the requirement on this one, and an app that shows milligrams without knowing which diet you are on is quietly showing you the wrong finish line.
Zinc changes for the same kind of reason. The zinc chapter puts a ceiling on it: the requirement for dietary zinc may be as much as 50 percent greater for vegetarians and particularly for strict vegetarians whose major food staples are grains and legumes and whose dietary phytate:zinc molar ratio exceeds 15:1. The mechanism is phytate in grains and legumes, which is to say the mechanism is the staples of the diet.
Iodine is not a property of the food. The iodine chapter is direct about why a database cannot help you here: the iodine content in most food sources is low and can be affected by content of soil, irrigation, and fertilizers, with most foods providing 3 to 75 micrograms per serving and foods of marine origin carrying more. The adult RDA is 150 micrograms per day. The same review notes that iodised salt is mandatory in Canada and optional in the United States. No food database knows which salt is in your kitchen, which means no app can compute this number for you honestly. It can only ask.
Why your app's micronutrient screen is mostly blank
Here is the part that surprises people. The four numbers above are not missing from apps by accident or by laziness. They are missing because of what a label is required to carry and where app databases get their food data.
The Nutrition Facts regulation is specific about which vitamins and minerals must appear. The declaration shall include vitamin D, calcium, iron, and potassium in that order, and other vitamins and minerals may be included, or must be included only when they are added as a nutrient supplement or a claim is made about them. Vitamin B12 is not mandatory. Zinc is not mandatory. Iodine is not mandatory. Three of the four numbers that matter most on this diet are optional on the panel.
Now follow where a barcode scanner gets its data. USDA FoodData Central describes its branded database as a public-private partnership whose goal is to enhance the open sharing of nutrient data that appear on branded and private label foods and are provided by the food industry. Data that appear on the label, provided by the manufacturer. If the panel did not have to print B12, the record does not have it either.
So the daily B12 total in a tracker built on branded data is not a low number. It is an absent number displayed as a low number. The distinction matters enormously, and almost no app draws it.
| Nutrient | What this diet does to it | Is it required on the label | What that means inside the app |
|---|---|---|---|
| Vitamin B12 | Not a component of plant foods. Present only where something was fortified | No | Usually no value at all on branded entries. A zero on the screen is a measurement that was never taken |
| Iron | Requirement 1.8 times higher for vegetarians, because absorption is roughly 10 percent rather than 18 | Yes | The milligrams are real, the target is wrong unless the app applies the factor and says that it did |
| Zinc | Requirement up to 50 percent greater, driven by phytate in grains and legumes | No | Mostly blank on packaged foods, so a full bar means nothing |
| Iodine | Content of most foods is low and varies with soil, irrigation and fertiliser. Salt iodisation is optional in the United States | No | Not computable from a database. The app should ask you once about your salt rather than guess forever |
The checklist: what a vegetarian or vegan app has to do
Nine things. The first four decide whether the app can answer your questions at all. The rest decide whether you are still using it next month.
- An ingredient list inside the entry. Not just calories and macros. If an app cannot show you what is in the product, it cannot help you decide anything, however good its charts are.
- A verdict you can trace. When the app says vegan, it should be able to say why: because a certifier says so, because the ingredient list contains nothing on its stop list, or because a person typed it in. A verdict with no origin is a guess wearing a badge.
- A search that knows the words. Gelatin, carmine, cochineal, rennet, whey, casein, lard, tallow, isinglass, shellac. An app that only matches the words meat and milk is checking spelling, not food.
- A wall between "no animal allergen declared" and "no animal ingredient". These are two different statements and no app should ever derive the second from the first. See the test in the box above.
- A micronutrient screen that tells zero apart from unknown. This is the single most useful feature on this diet and it is close to nonexistent. Absent B12 data and genuine absence of B12 look identical on almost every screen ever shipped, and only one of them is information.
- Somewhere to record an answer that came from a person. The manufacturer who replied about their mono- and diglycerides, the cheesemonger who checked the enzyme, the waiter who went back to the kitchen. With a date, because reformulations happen and a two-year-old answer is a rumour.
- Editable entries with a visible source. You will find wrong data. The question is whether you can correct it, and whether you can tell a verified entry from something a stranger typed in.
- A safe list you build yourself. This diet is repetitive by design: once something is checked, you buy it again. If the app has no way to keep a personal list of items already cleared, you will re-read the same label every fortnight and then stop opening the app.
- Export. CSV or anything you can open elsewhere. The list of products you have verified and the answers you collected from manufacturers is the asset you are building here, and it should outlive your interest in any one app.
Notice what is not on that list: photo recognition, streaks, coaching, a recipe feed. They can be pleasant. None of them tells you whether the sweets in your hand contain gelatin.
A seven-day test
Install one candidate, not four. Seven days, one question each day.
- Day one, your own shelf. Scan five packaged items you already own. Count how many gave you a readable ingredient list rather than only a macro panel. That number is the ceiling on everything else the app can do for you.
- Day two, the words. Search the app for gelatin, carmine, rennet and casein. If it treats them as ordinary strings with no connection to animal origin, you have learned exactly what the search is worth.
- Day three, the allergen trap. Find a product with gelatin or carmine and no declared milk, egg, fish or shellfish, and see what the vegan filter says. This is the test that separates an allergen field from an animal-ingredient check.
- Day four, the blank. Open yesterday's micronutrient screen and look for vitamin B12, zinc and iodine. Can you tell whether a low number is a low food or a missing record. If the app cannot make that distinction visible, do not trust any of those three bars again.
- Day five, the person. Log a meal somebody else cooked, including what you were told about the stock, the cheese or the fat it was fried in. If there is nowhere to put that, the app only works inside your own kitchen.
- Day six, the safe list. Try to answer one question inside the app: which products have I already checked. If that takes longer than scrolling your own memory, the app is not saving you anything.
- Day seven, exit. Export the week and open the file. Then decide: did this app answer questions before meals and flag a nutrient gap after them, or did it only describe meals afterwards. Only the first kind is worth a place on your home screen.
Red flags
- A vegan filter that returns a verdict with no explanation of where the verdict came from.
- A verdict derived from the allergen field. It cannot see meat, gelatin, rennet or honey.
- A micronutrient dashboard that shows every nutrient as a bar, with no way to tell an empty record from an empty plate.
- B12 credited from a seaweed or algae entry, presented with the same confidence as B12 from a fortified cereal.
- A photo estimate that returns a plant-based verdict on a cooked dish. A photograph cannot see the stock or the fat in the pan.
- Entries that carry macros but no ingredients, especially for sweets, sauces, dressings, soups and cheese.
- Supplements sold inside the tracker. Once the app has something to sell you, its opinion about your B12 has a second job.
- No export, and no answer about where the food data came from.
When a note on your phone is enough
If you shop in the same two shops and cook the same dozen dishes, an app is optional. Keep a note with the products you have cleared, the brands that have let you down, the manufacturer replies you have collected, and whether your salt is iodised. That is a complete system and it costs nothing.
A tool starts earning its place when the variety goes up: travel, eating out, a shared kitchen, a canteen you did not choose, or the moment a blood test raises a question about B12 or iron. That is also when a weak database and a slow logging flow start costing you actual meals. If you are working on the food side first, our vegan diet planner guide covers the cooking and the weekly shop, our vegan meal plan for a small budget and no kitchen covers the hardest version of that, how to choose an app for a gluten-free diet is the same exercise for a diet where the answer is also yes or no, and what AI meal planner apps actually do covers the category one level above this question.
What we are building
BeCute is being built against the checklist above rather than against a calorie budget: the ingredient list where you can read it, a verdict that says where it came from, a stop list that includes the words a label is allowed to hide behind, a micronutrient view that admits when it has no record, and a place to keep the answers you collected from people rather than packages.
What is not true yet: you cannot install BeCute tonight and run the seven-day test on it. That is exactly why the test above is written for whatever is on your phone right now.
If you want to hear the day that changes, put your email on the early access list. One email, no drip campaign.
FAQ
What should I actually look for in a meal planning app on a vegan diet?
An ingredient list you can read inside the entry, a verdict that tells you where it came from, a search that recognises gelatin, carmine, rennet and casein as animal-derived, a micronutrient screen that can admit it has no data, and somewhere to record what a manufacturer or a waiter told you. Everything else is decoration. If an app shows only calories and macros, it cannot answer either of the two questions this diet asks.
Can I trust an app's vegan or vegetarian filter?
Only as far as it will tell you what it is reading. Many filters are built on allergen data, and in the United States that data covers nine major food allergens, of which four are animal foods: milk, eggs, fish and Crustacean shellfish. Meat, gelatin, rennet, honey and animal-derived flavourings are outside that list entirely. A product containing gelatin or carmine with no dairy or egg declared is the case that exposes the difference, and it is worth testing deliberately before you rely on any filter.
Why does "natural flavor" matter so much on a vegetarian diet?
Because the regulation that defines the term includes flavouring constituents derived from meat, seafood, poultry, eggs and dairy products, and the general requirement to use a specific rather than a collective name has an explicit exception for flavourings. So two permitted words can stand in for an animal-derived ingredient, legally, with no further disclosure. An app that scores "natural flavor" as plant-based has made a decision on your behalf that the label did not authorise.
Why is my app's vitamin B12 number always low or missing?
Because the Nutrition Facts panel is only required to declare vitamin D, calcium, iron and potassium, and USDA FoodData Central describes its branded database as nutrient data that appear on labels and are provided by the food industry. B12 was never required, so the record usually does not have it. A low B12 total in a tracker built on branded data is often an absent value drawn as a small bar, which is a different thing from a small intake.
Do vegetarians really need more iron and zinc, or is that a myth?
It is in the reference intake reports. For iron the estimate is that bioavailability from a vegetarian diet is around 10 percent rather than 18 percent from a mixed Western diet, so the requirement is 1.8 times higher for vegetarians. For zinc the requirement may be as much as 50 percent greater, particularly for strict vegetarians whose staples are grains and legumes and whose phytate to zinc molar ratio exceeds 15:1. Whether that changes anything for you personally is a question for a blood test and a clinician, not for an app.
Can I use BeCute for this today?
No. BeCute is in early access and there is nothing in the app stores to install yet, so the honest answer is that you cannot run the seven-day test on it. What we can tell you is what it is being built to do, which is the checklist above. If you want to be told the day that changes, the early access list is the whole mechanism.
Sources
- U.S. Food and Drug Administration. "Food Allergies" (the nine major food allergens: milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame). fda.gov
- 21 CFR 101.4, Food; designation of ingredients (an ingredient name shall be specific and not collective, with an exception for spices, flavourings, colourings and chemical preservatives). ecfr.gov
- 21 CFR 101.22, Foods; labeling of spices, flavorings, colorings and chemical preservatives (definition of "natural flavor", including constituents derived from meat, seafood, poultry, eggs and dairy products). ecfr.gov
- 21 CFR 73.100, Cochineal extract; carmine (identity as an extract of the insect Dactylopius coccus costa, and the requirement to declare "cochineal extract" or "carmine" by name, as amended at 74 FR 216, Jan. 5, 2009). ecfr.gov
- 21 CFR 189.5, Prohibited cattle materials (definition of gelatin as partial hydrolysis of collagen derived from hides, connective tissue and bones of cattle and swine). ecfr.gov
- 21 CFR 184.1685, Rennet (animal-derived) and chymosin preparation (fermentation-derived) (rennet as an extract of the fourth stomachs of calves, kids or lambs). ecfr.gov
- 21 CFR 133.113, Cheddar cheese (optional ingredients include rennet and other clotting enzymes of animal, plant or microbial origin). ecfr.gov
- 21 CFR 184.1505, Mono- and diglycerides (prepared from fats or oils or fat-forming acids derived from edible sources). ecfr.gov
- 21 CFR 101.9, Nutrition labeling of food (the declaration of vitamins and minerals shall include vitamin D, calcium, iron and potassium; others are voluntary unless added or claimed). ecfr.gov
- Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline, chapter on Vitamin B12 (B12 is not a component of plant foods; RDA 2.4 micrograms per day for adults; crystalline B12 appears only in fortified foods; uncertainty about the B12 content of certain algae). National Academies Press, via NCBI Bookshelf. ncbi.nlm.nih.gov
- Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc, chapter on Iron (bioavailability approximately 10 percent from a vegetarian diet rather than 18 percent from a mixed Western diet; requirement 1.8 times higher for vegetarians). ncbi.nlm.nih.gov
- Institute of Medicine, same report, chapter on Zinc (requirement may be as much as 50 percent greater for vegetarians, particularly where the phytate to zinc molar ratio exceeds 15:1). ncbi.nlm.nih.gov
- Institute of Medicine, same report, chapter on Iodine (iodine content of most foods is low and affected by soil, irrigation and fertilizers; most foods provide 3 to 75 micrograms per serving; adult RDA 150 micrograms per day; salt iodisation mandatory in Canada and optional in the United States). ncbi.nlm.nih.gov
- USDA Agricultural Research Service. "About FoodData Central" (Branded Foods contains nutrient data that appear on branded and private label foods and are provided by the food industry). FoodData Central
- U.S. Food and Drug Administration. "Listing of Color Additives Exempt From Certification; Food, Drug, and Cosmetic Labeling: Cochineal Extract and Carmine Declaration", final rule, 74 FR 207, January 5, 2009 (the rule responds to reports of severe allergic reactions, including anaphylaxis). federalregister.gov
Written by
Oleksandr PaduraFounder & CEO at BeCute
Oleksandr Padura is the founder of BeCute. He built BeCute to make personalized nutrition planning accessible to everyone through AI technology.
Published: 2026-08-26
Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making changes to your diet or health routine.