By Paleo Life Coach Editorial Team · Last updated November 12, 2026 · Sources checked October 8, 2026 against USDA FoodData Central, Codex, WHO JECFA, FAO, CDC, FSANZ, FDA and the paleo program pages
A bag of cassava flour says “paleo” on the front. A food-safety page says the root must be peeled and fully cooked. Then a search turns up the word cyanide. So is cassava paleo, and is it safe? Both answers depend on whether you mean the root, the flour or the starch.
The quick version: Cassava is a grain-free root. The autoimmune protocol allows it and Whole30 allows it outside baked goods, but The Paleo Diet lists it as a food to avoid. It’s dense: a cup of cooked cassava has about 63 g of carbohydrate. Raw cassava contains cyanide-forming compounds, so the Codex standard says it must be peeled and fully cooked.
Cassava root, cassava flour and tapioca starch are three different foods
One plant, Manihot esculenta, gives you all three, and they don’t look alike on a nutrition label. The Codex Alimentarius standard for the fresh root notes that cassava is also called manioc, mandioca, tapioca, aipim or yucca. USDA and Consumer Reports use the name yuca too.
- The root (yuca) is a fresh or frozen starchy vegetable. USDA’s raw entry is 59.7% water.
- Cassava flour is the whole root, dried and milled. Codex defines it as “the product prepared from dried cassava chips or paste by a pounding, grinding or milling process, followed by sifting to separate the fibre from the flour” (Codex Standard 176-1989).
- Tapioca starch (also sold as tapioca flour) is only the starch, which Consumer Reports describes as “extracted from the root through washing and pulping.” Tapioca pearls and boba are made from it.
| Cassava product (USDA entry) | Serving | Calories | Carbs (g) | Fiber (g) | Potassium (mg) | Share of a 150 g carb day |
|---|---|---|---|---|---|---|
| Cassava, cooked (FDC 2709564) | 1 cup, 160 g | 306 | 63.4 | 3.0 | 451 | 42% |
| Yuca fries (FDC 2709565) | 1 cup, 140 g | 377 | 48.6 | 2.2 | 346 | 32% |
| Cassava flour (FDC 2512377) | 30 g | 107 | 26.2 | 1.4 | 59 | 17% |
| Tapioca, pearl, dry (FDC 169717) | 30 g | 107 | 26.6 | 0.3 | 3 | 18% |
Calculation: USDA FoodData Central values per 100 g times the serving weight USDA lists (30 g is its reference amount for the flour; we used the same for tapioca). Cooked root and fries are FNDDS entries published October 2024, the flour is a Foundation Foods entry from April 2023, and tapioca is SR Legacy. Read October 8, 2026. The 150 g figure is explained below.
What is lost between the root and the starch?
Mostly the minerals and the little protein there was. The fresh root is more than half water, so the fair comparison is per 100 g of dry matter, calculated here from USDA’s water values.
| Per 100 g of dry matter | Raw root (FDC 169985) | Cassava flour (FDC 2512377) | Tapioca pearls (FDC 169717) |
|---|---|---|---|
| Carbohydrate (g) | 94.5 | 97.7 | 99.7 |
| Fiber (g) | 4.5 | 5.4 | 1.0 |
| Protein (g) | 3.4 | 1.0 | 0.2 |
| Potassium (mg) | 672 | 221 | 12 |
Calculation: nutrient per 100 g divided by (100 minus water), times 100. Water is 59.7 g in the raw root, 10.6 g in the flour and 11.0 g in tapioca. These are three separate USDA samples, not one root followed through a factory.
All three are carbohydrate foods: 94% to nearly 100% of what isn’t water. The flour keeps the fiber but only about a third of the potassium, and the starch keeps almost nothing except starch. That explains how two sources can disagree. Harvard’s diet review says cassava “may be allowed in moderation” on paleo “because of their high nutrient content” (Harvard T.H. Chan School of Public Health). The Paleo Diet’s tapioca article says cassava “is not a nutritious food. It’s pretty much straight carbs.” The first fits the root; the second fits the starch.
For how these flours handle in baking, see our paleo flour guide.
How many carbs are in a serving of cassava?
A cup of cooked cassava has about 63 g of carbohydrate and 306 calories, which makes it far denser than potato or sweet potato.
Per 100 g cooked, USDA lists 39.6 g of carbohydrate for cassava, against 20.7 g for baked sweet potato (FDC 168483) and 21.2 g for baked white potato (FDC 170093). Cassava has nearly twice the carbs of either, with 191 calories against 90 and 93. The cooked entry’s fat (3 g) and sodium (145 mg) are higher than the raw root’s, which points to fat and salt added in cooking.
Paleo doesn’t set a carb number, so we used one published reference point: Mark Sisson’s Primal macronutrient guide says that even with “a fair amount of fruit or starchy vegetables, you’ll be hard-pressed to exceed 150 grams of carbs on average per day” (Mark’s Daily Apple). Against that 150 g:
- One cup of cooked cassava is 42% of the day.
- A half cup (80 g, 31.7 g of carbohydrate) is 21%.
- A 30 g measure of cassava flour is 17%, before anything else in the recipe.
If you’re keeping carbs low, measure cassava by the half cup. Our guide to paleo carbs per day sets the ranges, and is sweet potato paleo compares the lighter roots.
Why does cassava contain cyanide, and which kinds have the most?
Cassava makes a compound called linamarin. When the root’s cells are crushed or digested, an enzyme converts linamarin into hydrogen cyanide. The FAO’s manual on root crops describes linamarin as “a cyanogenic glycoside which is converted to toxic hydrocyanic acid” on contact with that enzyme, and adds that linamarin itself “is not changed by boiling the cassava” (FAO, Roots, tubers, plantains and bananas in human nutrition, 1990).
How much is there depends on the variety:
- Sweet cassava contains less than 50 mg of hydrogen cyanide per kg of fresh root. That is the definition in the Codex standard for the roots sold fresh to consumers.
- Bitter cassava “may contain up to 400 mg per kilogram,” eight times that ceiling, according to Hong Kong’s Centre for Food Safety. The FAO gives the normal range for cassava tubers as 15 to 400 mg per kg.
- Wild cultivars can reach 2,000 ppm of dry weight, according to a CDC report.
The FAO adds two kitchen details. The cyanide content is “substantially higher in the cassava peel.” And “bitterness is not necessarily a reliable indicator of cyanide content,” so taste is not a test.
A 2004 risk assessment by Food Standards Australia New Zealand (FSANZ) said that bitter varieties “are not normally commercially traded” there. The Codex standard for cassava sold fresh to consumers covers sweet varieties only, and it requires the package to name the type.
What do food-safety agencies say about preparing fresh yuca?
They agree on the minimum: never eat cassava raw, peel it, and cook it through. They differ on whether cooking alone is always enough. Each source in its own words:
| Source | What it says about the fresh root |
|---|---|
| Codex Standard for Sweet Cassava (CXS 238-2003, amended 2013) | “In any case, cassava must be peeled and fully cooked before being consumed.” Packages must carry that instruction. |
| New Zealand Ministry for Primary Industries (MPI) | “Peel and slice before cooking thoroughly, by baking, boiling, or roasting. Do the same thing if the cassava has been frozen.” |
| Hong Kong Centre for Food Safety (February 2008) | Sweet roots “can generally be made safe to eat by peeling and thorough cooking.” Cutting into small pieces, then “soaking and boiling in water is particularly effective.” Bitter roots need far more processing. |
| Food Standards Australia New Zealand (page updated October 2, 2025) | Safe “provided you prepare them properly.” Detoxification by boiling, steaming, baking or frying “varies from 10 to 75%,” and none of these is “reliable” by itself. Soaking-based methods remove more. |
| FAO roots and tubers manual (1990) | “Simple boiling of fresh root pieces is not always reliable.” After 30 minutes of cooking, about 8% of the cyanide remained when the pieces started in cold water and about 30% when they went straight into boiling water. |
Read together: how much cooking removes depends on how much cyanide the root started with and on how it’s cut and soaked. Drawn only from the pages above:
- Buy from a reliable supplier.
- Peel it. The peel carries the most cyanide.
- Cut it into small pieces, and soak them in water.
- Cook it thoroughly in boiling water, or bake or roast it until fully cooked. Treat frozen cassava the same way.
None of these sources gives a home cooking time that guarantees safety, so we don’t either. Skip any root that tastes bitter, and remember that a mild taste proves nothing.
Do cassava flour and tapioca need the same care?
Commercial flour and starch have already been processed, so the job of removing cyanide sits with the maker. Hong Kong’s food safety agency says “adequately processed cassava flour and cassava-based products have very low cyanide contents and are considered safe to use.” The FSANZ assessment calls tapioca pearls “a processed product which has a long history of safe consumption.”
The benchmark is 10 mg of hydrogen cyanide per kg of flour. The WHO and FAO expert committee on food additives (JECFA) concluded that a level of up to 10 mg/kg in the Codex cassava flour standard “is not associated with acute toxicity.” In 2011 it set an acute reference dose of 0.09 mg of cyanide equivalents per kg of body weight (90 micrograms), built from an animal study with a safety factor of 100, and modeled three foods against it (WHO JECFA database).
| Food and cyanide level modeled by JECFA | Adults (micrograms per kg body weight) | Children | Against the 90 microgram reference dose |
|---|---|---|---|
| Cassava flour at 10 mg/kg | 30 | 70 | Below it: 33% and 78% |
| Cassava chips at 10 mg/kg | 25 | up to 100 | Adults 28%; children up to 1.1 times |
| Large portion of sweet cassava at 50 mg/kg | 150 | 330 | Above it: 1.7 and 3.7 times |
Source: JECFA 74th meeting (2011) summary, read October 8, 2026. Percentages calculated here. The reference dose is a conservative guidance value, not a poisoning threshold; the Hong Kong agency reports the acute lethal dose of hydrogen cyanide for humans as 0.5 to 3.5 mg per kg of body weight.
The last row is why 50 mg/kg is a definition, not a safe-as-is number: the standard that sets it also orders the root peeled and fully cooked.
Processing can fail. In September 2017, 98 people in western Uganda fell ill and two died after eating a dish made by stirring cassava flour into hot water. Investigators traced the flour to wild cultivars. Five samples averaged 88 ppm of cyanide, “more than eight times the recommended safe level of 10 ppm” (CDC, Morbidity and Mortality Weekly Report 2019;68:308-311). The report doesn’t involve flour sold in the United States, but it shows what the 10 ppm limit is for.
What about lead in cassava flour?
Lead is a separate issue from cyanide, and it concerns flour more than starch. Consumer Reports tested 27 cassava products and reported that more than two-thirds had more lead in one serving than its experts’ daily level of concern (Consumer Reports, updated May 8, 2025). The details:
- CR’s level of concern is 0.5 micrograms a day, California’s Proposition 65 figure, which CR calls “the most protective lead standard available.”
- Four of the seven cassava flours tested had 1,000% to more than 2,300% of that level in a quarter cup. That works out to roughly 5 to 11.5 micrograms.
- Products made with tapioca starch or syrup “tended to have lower lead levels.”
- CR’s own advice was “don’t panic”: the risk comes from repeated exposure, and many of the products “can be eaten occasionally.”
For scale, the FDA says there is “no known safe level of exposure to lead” and uses interim reference levels of 2.2 micrograms a day for children and 8.8 for females of childbearing age (FDA, Lead in Food and Foodwares, content current as of January 6, 2025). The two benchmarks are built differently, so don’t read one as the other.
The results cover the lots CR bought, and several makers have since reformulated or dropped products, so check CR’s list for your brand. If you bake with cassava flour daily, are pregnant or feed young children, rotating flours is a reasonable response.
So is cassava paleo? Where four plans draw the line
Cassava isn’t a grain, legume or dairy food, so it passes the basic paleo test. The plans split on whether a starch this dense belongs.
The Paleo Diet (Loren Cordain’s site): avoid. Its article on foods it has changed its mind about over 20 years says cassava “has an even higher GL than potatoes” and contains antinutrients, “making this popular food choice on the list of foods to avoid on The Paleo Diet” (The Paleo Diet). Its tapioca article states that “tapioca flour is not Paleo” and says to eat it only within the 15% allowed by its 85/15 rule (The Paleo Diet).
Whole30: yes, with context. Its guide lists cassava flour and tapioca starch as “Yes, with context.” You can thicken a sauce or dredge chicken with them, but baked goods, tortillas and pasta made from them fall under its Pancake Rule, and cassava chips are out for the 30 days (Whole30 “Can I have” guide). The guide has no separate entry for the whole root. Our paleo vs Whole30 guide covers the rest.
Autoimmune protocol: allowed. Autoimmune Wellness lists tapioca starch and cassava flour as pantry staples, and its author states that “yucca and tapioca are both AIP-legal,” while noting “the starch in cassava flour can irritate some folks” (Autoimmune Wellness). Our AIP diet guide has the full lists.
Primal: no specific rule. We found no cassava ruling on the Primal pages we opened. The macronutrient guide suggests more “tubers, and root vegetables” for endurance athletes.
If you follow paleo loosely, the white rice “safe starch” debate is the closest parallel; is rice paleo walks through it.
Who should be careful with cassava?
Anyone cooking the fresh root for children. Hong Kong’s food safety agency notes that children “are particularly at risk because of their smaller body size.”
People who would eat it as a daily staple. The long-term nerve conditions linked to cassava occur where people depend on “a monotonous cassava-based diet,” in the CDC report’s words. The published lead results also matter most with daily use, in pregnancy and for young children.
Anyone counting carbs. A cup of cooked cassava is about 63 g of carbohydrate, not a side vegetable.
Frequently asked questions about cassava on paleo
Is cassava flour paleo?
It depends on the plan. Cassava flour is grain-free, and Whole30 and the autoimmune protocol both permit it, though Whole30 bans baked goods made from it during the 30 days. The Paleo Diet puts cassava on its list of foods to avoid. A 30 g serving has about 26 g of carbohydrate.
Is tapioca paleo?
Tapioca is the extracted starch of the cassava root, so it’s grain-free. Autoimmune Wellness calls it AIP-legal, and Whole30 allows it as a thickener. The Paleo Diet says tapioca flour “is not Paleo.” In USDA data, tapioca is almost pure starch: 0.2 g of protein and 11 mg of potassium per 100 g.
Can you eat cassava raw?
No. The Codex standard for sweet cassava states that it “must be peeled and fully cooked before being consumed,” and requires that instruction on the package. Raw cassava contains compounds that release hydrogen cyanide. New Zealand’s Ministry for Primary Industries says to treat frozen cassava the same way.
Does boiling remove the cyanide from cassava?
It lowers it, but by how much varies. Food Standards Australia New Zealand reports that cooking methods remove 10% to 75%. An FAO manual found about 8% remaining after 30 minutes when pieces started in cold water, and about 30% when dropped into boiling water. Peeling, cutting small and soaking all help.
The short version: three products, three answers
The root is the most nutritious form and the only one you make safe yourself: peel it, cut it, cook it through. The flour relies on its maker for both cyanide processing and lead, so don’t make it your only flour. The starch is the cleanest on both counts and the emptiest nutritionally. Whether any of them counts as paleo depends on your rulebook. Check other foods with our Is It Paleo? food checker, or start from what the paleo diet is.
This guide is general information, not medical advice. If you think someone has eaten raw or bitter cassava and feels unwell, call Poison Control or emergency services. Talk to your doctor or a registered dietitian before making cassava a staple if you’re pregnant, feeding young children, or managing diabetes or a thyroid condition.
Research cited in this guide
All pages were read on October 8, 2026. Program pages are linked where they’re quoted. The main ones:
- FoodData Central – U.S. Department of Agriculture
- Standard for Sweet Cassava, CXS 238-2003 – Codex Alimentarius
- Cyanogenic glycosides, JECFA evaluations – World Health Organization
- Roots, tubers, plantains and bananas in human nutrition, chapter 7 – Food and Agriculture Organization
- Outbreak of Cyanide Poisoning Caused by Consumption of Cassava Flour, Kasese District, Uganda, September 2017 – CDC, MMWR, April 5, 2019 (cdc.gov/mmwr/volumes/68/wr/mm6813a3.htm)
- Cassava and bamboo shoots – Food Standards Australia New Zealand
- Cyanogenic Glycosides in Cassava and Bamboo Shoots, Technical Report 28 (2004) – Food Standards Australia New Zealand
- Lead in Food and Foodwares – U.S. Food and Drug Administration
- Cassava Flour, Chips, Bread, and More Contain High Levels of Lead – Consumer Reports