Cassava bread is a flatbread made from the starchy root of the cassava plant, one of the oldest prepared foods in the Americas. In its simplest form, it requires just two ingredients: grated cassava and salt. The result is a dense, chewy disk that’s naturally gluten-free and has served as a dietary staple across the Caribbean, South America, and parts of Africa for centuries.
Types of Cassava Bread
The most widespread version is casabe (also spelled cazabe), a dry, cracker-like flatbread that originated with the Taíno people of the Caribbean. To make it, cassava root is peeled, grated, pressed to remove liquid, sieved into a fine meal, then shaped into large circular disks and baked on a flat stone hotplate called a burén. These rounds can be as large as two feet across. Because casabe is dried thoroughly during cooking, it keeps far longer than most breads, which made it essential for long voyages and trade in pre-colonial times.
Bammy is a Jamaican variation descended from the same Taíno flatbread tradition. It’s denser and softer than casabe because after the initial baking, the bread is soaked in coconut milk and then fried. Bammy is typically served alongside fish or vegetables and remains a common street food and home dish in Jamaica.
More recently, cassava flour has been blended into modern loaf-style breads, often mixed with wheat flour at ratios of 10 to 20 percent cassava. These composite loaves look and feel closer to standard sandwich bread while incorporating cassava’s properties. Research has found that replacing 20 percent of wheat flour with fermented cassava flour produces bread with softer texture, higher elasticity, and flavor scores nearly matching pure wheat bread.
Nutritional Profile
Cassava bread is primarily a carbohydrate source. Per 100 grams, traditional casabe contains about 299 calories, 71 grams of carbohydrate, 2.5 grams of protein, 3.4 grams of dietary fiber, and just 0.5 grams of fat. Most of those carbohydrates are complex starches rather than sugars (only 3.2 grams per serving is sugar).
That high starch content puts cassava bread on the higher end of the glycemic index. Studies testing cassava-wheat blends in healthy volunteers found glycemic index values between 91 and 94, which is comparable to white bread. Interestingly, increasing the proportion of cassava flour in those blends led to slightly lower glycemic responses overall, though the differences were modest.
One nutritional advantage comes from the type of starch in cassava flour. Compared to isolated cassava starch, whole cassava flour contains more slowly digestible and resistant starch. Resistant starch passes through the stomach and small intestine without being fully broken down, reaching the large intestine where gut bacteria ferment it. Animal studies have shown that cassava flour diets promote the growth of beneficial gut bacteria, including species linked to butyric acid production, a compound that supports the intestinal lining.
Why It’s Naturally Gluten-Free
Cassava is a tuber, not a grain, so it contains no gluten proteins. This makes pure cassava bread safe for people with celiac disease or gluten sensitivity. The food industry has increasingly used cassava flour as a primary ingredient in gluten-free products, from breakfast cereals to flatbreads. If you’re buying commercial cassava bread rather than making it yourself, check the label for wheat-based additives or shared production lines, since some products blend cassava with wheat flour.
How Cyanide Is Removed During Processing
Raw cassava contains compounds that release hydrogen cyanide (HCN) when the plant tissue is damaged. This is the main safety concern with cassava, and it’s the reason proper processing matters. The international safety standard set by the FAO and WHO caps HCN at 10 mg/kg in edible cassava products.
Traditional cassava bread preparation handles this naturally through multiple steps. Peeling removes the outer layers where cyanide compounds are most concentrated. Grating and pressing squeeze out the liquid, which carries a large share of the toxins with it. Baking or frying then volatilizes remaining traces through heat. When all these steps are combined (peeling, soaking, fermenting, and frying), HCN can be reduced by up to 100 percent, leaving final levels as low as 1.5 mg/kg. Even simple boiling for 30 minutes removes about 96 percent.
Fermentation is particularly effective. Microorganisms break down the cyanide-producing compounds into less toxic forms, which is why fermented cassava products like casabe and bammy have an excellent safety record spanning thousands of years. The risk comes primarily from shortcuts: eating underprocessed cassava root, or relying on soaking alone, which only reduces cyanide by about 20 percent.
How Fermentation Changes the Flour
Beyond safety, fermenting cassava flour before baking transforms its baking properties. Fermentation breaks down starch granules, reducing particle size and lowering the paste’s viscosity. In practical terms, this means the dough is easier to handle and mix. The flour also becomes more stable during cooking, resisting the retrogradation (staling and hardening) that plagues many gluten-free baked goods.
Fermentation also boosts protein content slightly, increases the variety of flavor compounds, and improves overall nutrient availability. These changes explain why fermented cassava flour performs better in bread recipes than unfermented flour, producing loaves that are less dense and more palatable.
Storage and Shelf Life
Traditional casabe, because it’s dried to a very low moisture content, can last for weeks or even months when stored in a cool, dry place. This durability is one reason it became a travel food throughout the Caribbean.
Modern cassava-wheat composite bread behaves more like conventional bread. Stored at room temperature (roughly 25 to 31°C), composite loaves last about 5 to 7 days, while pure wheat bread lasts 7 to 8 days under the same conditions. Heat shortens shelf life: bread stored in warmer conditions (26 to 35°C) loses a day or two. If you’re making or buying soft cassava bread rather than the traditional dry flatbread, plan to use it within the week.