Gari is a decent source of energy and contains some beneficial compounds from fermentation, but it comes with a significant downside: a very high glycemic index that can spike blood sugar rapidly. Whether gari is “good” for you depends largely on how much you eat, what you pair it with, and whether you have blood sugar concerns.
High Glycemic Index Is the Main Concern
Gari ranks among the highest-glycemic foods you can eat. Studies measuring blood glucose responses in healthy subjects have found glycemic index values for conventional gari as high as 98.9, nearly identical to pure glucose (which scores 100 on the reference scale). Even under different fermentation conditions, the lowest recorded GI for gari was 62, which still qualifies as a high-glycemic food.
What this means in practice: eating gari on its own, especially in large portions, causes a rapid and steep rise in blood sugar followed by a sharp drop. Over time, frequent blood sugar spikes are linked to insulin resistance, weight gain, and increased risk of type 2 diabetes. If you already have diabetes or prediabetes, gari in large quantities is particularly problematic.
You can blunt this effect by eating gari alongside protein, healthy fats, or fiber-rich vegetables. A bowl of gari soaked in water with groundnuts (peanuts), for example, will produce a slower blood sugar response than gari eaten alone. Portion size matters too. A modest serving as part of a balanced meal is a very different story from a large bowl of eba as your primary calorie source.
Fermentation Adds Some Gut-Friendly Bacteria
Gari is made by fermenting grated cassava, and that fermentation process introduces beneficial lactic acid bacteria. The dominant species found in fermenting cassava is Lactobacillus plantarum, which makes up over half of the bacterial strains present. Lactobacillus fermentum and several other lactic acid bacteria are also produced during the process.
These are the same families of bacteria found in yogurt, kimchi, and other fermented foods known to support digestive health. However, gari is typically roasted after fermentation, and high heat kills most live bacteria. So while fermentation improves gari’s safety and digestibility, you’re unlikely to get a meaningful probiotic benefit from the finished product the way you would from eating fresh yogurt or uncooked fermented vegetables. The fermentation does break down some of the cassava’s natural compounds, making nutrients easier to absorb and reducing potentially harmful substances.
Resistant Starch Content Is Modest
Raw cassava tubers contain between 5.7% and 7% resistant starch, a type of fiber that feeds beneficial gut bacteria and can help with blood sugar control. Resistant starch passes through the small intestine undigested, functioning more like fiber than like a typical starch.
The problem is that processing cassava into gari destroys a large portion of this resistant starch. Studies show that gari production reduces resistant starch content by about 53% compared to the raw tuber. So while some resistant starch remains, gari is not a particularly good source of it. Other cassava products like abacha retain more (losing only about 36% during processing), and foods like cooked-then-cooled rice, green bananas, or oats deliver resistant starch more reliably.
Processing Makes Gari Safe to Eat
Raw cassava contains cyanogenic compounds that release hydrogen cyanide when the plant’s cells are broken down. This is the reason you should never eat raw or poorly processed cassava. Gari’s multi-step preparation (grating, fermenting, pressing, and roasting) is specifically designed to reduce these compounds to safe levels.
The international safety threshold for cassava flour is 10 mg/kg of hydrogen cyanide, and properly made gari falls well within this limit. Animal studies feeding diets containing 50% gari found no significant changes in blood chemistry or organ function. The fermentation step is especially important: bacteria break down cyanogenic compounds during the soaking period, which is why rushing or skipping fermentation can leave unsafe residues. As long as your gari was properly processed (fermented for at least 48 hours, pressed, and roasted), cyanide toxicity is not a realistic concern.
Yellow Gari Offers a Vitamin A Advantage
Yellow gari gets its color from one of two sources: added palm oil or biofortified yellow cassava varieties bred to contain higher levels of carotenoids, which your body converts into vitamin A. Either way, yellow gari provides a nutritional edge over white gari, which contains negligible vitamin A.
Biofortified yellow gari is particularly promising as a cheap, accessible source of vitamin A in regions where deficiency is common. It has a more uniform color than palm oil-treated gari and is less likely to go rancid during storage. One caveat: the carotenoids in yellow gari are sensitive to light, heat, and oxygen, so they degrade over time. Gari stored for long periods, especially in clear containers or warm environments, will lose much of its vitamin A content as the yellow color fades. For the best nutritional value, store yellow gari in a cool, dark place and use it relatively quickly.
The Bottom Line on Nutrition
Gari is primarily a source of carbohydrate calories. It provides energy but is low in protein, fat, and most vitamins and minerals (with the exception of yellow gari’s vitamin A content). It is not nutritionally dense compared to whole grains, legumes, or starchy vegetables like sweet potatoes.
That doesn’t make gari unhealthy in the right context. As part of a meal that includes protein (fish, beans, meat, eggs), vegetables, and healthy fats, gari contributes affordable, shelf-stable calories. The concerns arise when gari dominates the diet without enough variety to compensate for what it lacks. Eating large portions of gari as a staple, multiple times a day, with few accompanying nutrient-rich foods increases the risk of blood sugar problems and nutritional gaps over time. Moderate portions paired with a varied diet keep gari in the “perfectly fine” category rather than the “problematic” one.