How did we learn which plants are safe to eat? Food scientists explain

Phys · May 26, 2026 · 739 words · By Mani Naiker; Joel Johnson

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What to know about How did we learn which plants are safe to eat? Food scientists explain

The article explains how humans have identified and processed toxic plants for consumption through a combination of traditional knowledge and modern science. It discusses the role of dosage in toxicology and provides examples of how preparation methods and plant breeding make certain species safe for human diet.

Propaganda risk 0%

Claims checked 17

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center100%

Right0%

4 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

How did we learn which plants are safe to eat?

Why it matters

Food scientists explain Sadie Harley Scientific Editor Robert Egan Associate Editor Have you ever eaten a green potato, or a bunch of rhubarb leaves?

Common ground

Hopefully not, because these two plant parts can be toxic to humans.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: How did we learn which plants are safe to eat? Food scientists explain?
What evidence would most clearly confirm or weaken the claim that cyanide, a poisonous chemical found in the plant's [cassava] roots and leaves?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-05-safe-food-scientists.html

analyticsAnalysis

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 17 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

schedule Pending 7

info Single Source 5

check_circle Corroborated 3

verified Verified By Reference 2

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Claim 1: “cyanide, a poisonous chemical found in the plant's [cassava] roots and leaves”

SINGLE SOURCE

The claim is only supported by the cross-reference from The Conversation; no other provided evidence confirms the presence of cyanide in cassava.

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cross reference SUPPORTS — cyanide, a poisonous chemical found in the plant’s [cassava] roots and leaves
https://theconversation.com/how-did-we-learn-which-plants-ar…

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Claim 2: “In Australia, we have more than 1,000 native and introduced plant species that can be toxic to humans and animals”

SINGLE SOURCE

While the claim is made in The Conversation, the provided Wikipedia and web search results for 'Australia' are general geographical and historical overviews and do not mention the number of toxic plant species.

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wikipedia NEUTRAL — Taskmaster Australia is an Australian comedy panel game show first broadcast on Network 10 on 2 February 2023. Based on the British show Taskmaster created by comedian Alex Horne, the program revolves…
https://en.wikipedia.org/wiki/Taskmaster_Australia

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wikipedia NEUTRAL — Australia, officially the Commonwealth of Australia, is a country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It has a land area of 7,688,…
https://en.wikipedia.org/wiki/Australia

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wikipedia NEUTRAL — Australians, colloquially known as Aussies, are the citizens, nationals and individuals associated with the country of Australia. This connection may be residential, legal, historical or ethno-cultura…
https://en.wikipedia.org/wiki/Australians

+ 4 more evidence sources

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Claim 3: “Some Aboriginal communities in northern Australia would soak, grind or cook cycad seeds to remove naturally occurring toxins”

SINGLE SOURCE

The claim is only mentioned in the cross-reference from The Conversation; no other provided evidence corroborates the specific processing methods used by Aboriginal communities for cycad seeds.

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cross reference SUPPORTS — Some Aboriginal communities in northern Australia would soak, grind or cook cycad seeds to remove naturally occurring toxins before consumption
https://theconversation.com/how-did-we-learn-which-plants-ar…

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Claim 4: “in people with a genetic condition called G6PD deficiency, they [vicine and convicine] can trigger a serious reaction called favism”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

verified

Claim 5: “Oxalates are a type of toxin found in rhubarb leaves”

VERIFIED BY REFERENCE

Wikipedia and multiple health/educational sources (Hampshire College, Healthline) explicitly confirm that rhubarb leaves contain high levels of oxalic acid (oxalates).

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web search NEUTRAL — Rhubarb leaves contain. 0.5-1.0% oxalic acid, so that you would need to eat quite a large serving of the sour leaves, perhaps 10 pounds) to get a lethal dose ...
https://helios.hampshire.edu/~nlNS/mompdfs/oxalicacid.pdf

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web search NEUTRAL — Historically, different plants have been called "rhubarb" in English. The large, triangular leaves contain high levels of oxalic acid and anthrone glycosides, ...
https://en.wikipedia.org/wiki/Rhubarb

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web search NEUTRAL — Mar 17, 2020 ... Rhubarb leaves contain high amounts of oxalic acid, which can cause health problems when eaten in higher amounts. Symptoms of toxicity include ...
https://www.healthline.com/nutrition/rhubarb-leaves

+ 1 more evidence source

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Claim 6: “during soybean fermentation, microbes break down harmful compounds such as phytates and trypsin inhibitors”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 7: “Crops such as wheat and rice provide carbohydrates”

CORROBORATED

The claim is supported by The Conversation and multiple health-related web sources (NHS, MedCrave) confirming that rice and wheat are sources of carbohydrates/starch.

travel_explore

web search NEUTRAL — Starchy foods are our main source of carbohydrate and have an important role in a healthy diet. Starchy foods – such as potatoes, bread, rice, pasta, ...
https://www.nhs.uk/live-well/eat-well/food-types/starchy-foo…

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web search NEUTRAL — May 19, 2023 ... Whole-grain wheat and brown rice are fiber-rich and may improve constipation, whereas refined white rice and wheat may improve diarrhea. Whole ...
https://foodstruct.com/nutrition-comparison-text/rice-vs-whe…

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web search NEUTRAL — Mar 31, 2017 ... For people who manage their diabetes diet plan , eating whole wheat chapati is a better alternative. White rice has a higher glycemic index than ...
https://medcraveonline.com/IJCAM/what-is-more-safe-and-healt…

+ 1 more evidence source

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Claim 8: “scientists have used modern chemistry and plant breeding to develop new faba bean varieties with lower concentrations of these compounds [vicine and convicine]”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 9: “raw or undercooked kidney beans contain a natural toxin called phytohemagglutinin”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 10: “favism... causes your red blood cells to rapidly break down”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

info

Claim 11: “green potatoes contain glycoalkaloids, a group of chemicals that can cause symptoms such as vomiting, fever and diarrhea when consumed in large amounts”

SINGLE SOURCE

The provided evidence for this claim consists only of generic definitions of the color 'green' and does not contain any information about glycoalkaloids or potato toxicity.

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web search NEUTRAL — By far the largest contributor to green in nature is chlorophyll, the chemical by which plants photosynthesize and convert sunlight into chemical energy. Many creatures have adapted to their green env…
https://en.wikipedia.org/wiki/Green

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web search NEUTRAL — The color defined as green in the sRGB color space is approximately the most chromatic green that can be reproduced on an average computer screen, and is the color named green in X11. It is one of the…
https://en.wikipedia.org/wiki/Shades_of_green

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web search NEUTRAL — Green symbolizes growth, renewal, and life itself. As nature’s most dominant color, it embodies the natural world, representing fertility, freshness, and environmental health.
https://www.figma.com/colors/green/

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Claim 12: “Faba beans naturally contain vicine and convicine”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

verified

Claim 13: “cassava was first domesticated in South America”

VERIFIED BY REFERENCE

Wikipedia and Britannica confirm that cassava is native to South America and was domesticated there.

travel_explore

web search NEUTRAL — Read this Encyclopedia Britannica History list to learn about crops domesticated in the Americas.The exact origin of cacao (the source of chocolate) is debated, but it may have been domesticated in So…
https://www.britannica.com/story/18-food-crops-developed-in-…

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web search NEUTRAL — Cassava was the champion domesticated plant in the neotropics. After its initial domestication, it diffused through the region, reaching sites as far north as Panama within a few thousand years.
https://theconversation.com/cassava-the-perilous-past-and-pr…

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web search NEUTRAL — Manihot esculenta, commonly called cassava, manioc, or yuca, is a woody shrub of the spurge family, Euphorbiaceae, native to South America, from Brazil, Paraguay and parts of the Andes.
https://en.wikipedia.org/wiki/Cassava

+ 1 more evidence source

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Claim 14: “by soaking and thoroughly boiling kidney beans, you can easily get rid of this toxin [phytohemagglutinin]”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 15: “the tobacco plant, which produces nicotine, a natural alkaloid that helps protect the plant from insect attacks”

CORROBORATED

Multiple independent sources, including NIH (PMC) and academic research, confirm that tobacco plants produce nicotine as a defense mechanism against insect herbivores.

travel_explore

web search NEUTRAL — Aug 17, 2004 ... Caterpillars, aphids, and a diverse array of insects predisposed to devouring plants will soon abandon your vegetables and flowers in search of ...
https://pmc.ncbi.nlm.nih.gov/articles/PMC509307/

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web search NEUTRAL — For instance, ir-lox3 tobacco plants have lower nicotine content in the pith than wild-type plants and are more susceptible to stem borer attacks [40]. JA then ...
https://www.sciencedirect.com/org/science/article/pii/S00319…

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web search NEUTRAL — May 23, 2012 ... This specialist insect is resistant to the toxic nicotine, which the plant produces as a defence against its enemies. When researchers from ...
https://www.mpg.de/5811296/plants_defence

+ 1 more evidence source

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Claim 16: “green potato, or a bunch of rhubarb leaves... can be toxic to humans”

SINGLE SOURCE

The claim is made in The Conversation, but the provided web search results are generic definitions of the color 'green' and do not provide factual evidence regarding the toxicity of green potatoes or rhubarb leaves.

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+ 1 more evidence source

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Claim 17: “Globally, there are tens of thousands of plants that contain toxic compounds”

CORROBORATED

The claim is reported in The Conversation and repeated in multiple web search results from food scientists.

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web search NEUTRAL — 6 days ago ... Globally, there are tens of thousands of plants that contain toxic compounds. ... plant species that can be toxic to humans and animals ...
https://theconversation.com/how-did-we-learn-which-plants-ar…

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web search NEUTRAL — 3 days ago ... Globally, there are tens of thousands of plants that contain toxic compounds. ... plant species that can be toxic to humans and animals ...
https://m.farms.com/news/how-did-we-learn-which-plants-are-s…

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web search NEUTRAL — 2 days ago ... But the reality is that farmers have tens of thousands of species of weeds, insects, diseases and more to deal with. There are thousands of ...
https://www.facebook.com/nrdc.org/posts/nobody-wants-to-eat-…

+ 1 more evidence source

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.