What is acai? A plain guide

Acai (pronounced ah-sah-EE) is the small, dark purple fruit of a palm tree native to the Amazon rainforest, Euterpe oleracea. Most of what people eat isn't a berry in the strawberry sense — each fruit is mostly a large seed, with only a thin layer of pulp and skin around it, which is why it's almost always sold processed into juice, frozen pulp, powder or capsules rather than whole.

Where it comes from

Euterpe oleracea grows wild and is cultivated along rivers and floodplains in the Brazilian Amazon, especially in the state of Pará, where it has been a everyday food for generations before it reached grocery stores outside South America. The palm produces bunches of small round fruit that ripen to a deep purple-black.

How to say it

Acai is three syllables: ah-sah-EE. The written form carries a cedilla under the "c" in Portuguese (açaí), which is why people who've only seen it written sometimes guess "ah-KAI." The cedilla softens the "c" to an "s" sound, and the accent on the final "i" means the stress lands there.

What it tastes and looks like

Fresh acai pulp is usually described as earthy and slightly tart — closer to unsweetened dark berries or unsweetened cocoa than to a typically sweet fruit. Most of what people taste in an acai bowl or smoothie comes from what's blended in with it (banana, other fruit, a sweetener), not from the acai itself. The pulp is thick and deep purple, almost black.

Forms it's sold in

Fresh acai spoils within about a day of harvest, so almost nothing sold outside the Amazon is the fresh fruit itself. Instead:

• Frozen pulp or "smoothie packs" — pureed pulp and skin, frozen shortly after harvest, the base most acai bowls are made from.
• Juice or beverage blends — pulp diluted and bottled, sometimes combined with other fruit.
• Freeze-dried powder — pulp dried and ground, added to smoothies at home.
• Capsules — a concentrated acai extract or powder, sold alone or, more often, as one ingredient inside a larger blend. See how to choose a good acai for what to check on a label sold this way.

Why it's marketed as an antioxidant

Acai's pulp and skin are rich in anthocyanins, the same class of purple-red plant pigments found in blueberries and red grapes. A 2006 laboratory analysis of freeze-dried acai pulp measured some of the highest antioxidant scavenging activity recorded for any fruit tested against superoxide radicals specifically — a cell-free chemical measurement, not a result in a person. A 2008 trial gave 12 healthy volunteers acai pulp or juice and tracked anthocyanins in their blood afterward, confirming that some of these compounds are absorbed rather than simply passing through. Absorption and lab antioxidant scores are the reason acai gets marketed the way it does; they aren't the same thing as a proven health benefit. Acai benefits: what the research does and doesn't show covers what's actually been tested in people.

Questions people ask

Is acai a fruit?

Yes. It's the fruit of the acai palm (Euterpe oleracea), though most of each berry is a large seed — only a thin layer of pulp and skin around it is edible, which is why acai is almost always sold processed rather than whole.

What is an acai bowl made of?

The base is frozen acai pulp, usually blended with a banana or other fruit to make it scoopable, then topped with things like granola, more fresh fruit, honey or nut butter. The berry itself isn't sweet — most of the sugar and calories in a typical bowl come from those toppings and the blended fruit, not the acai.

Are acai bowls fattening?

That depends on what's in the bowl, not on the acai. A bowl built mostly from fruit with a light hand on granola, honey and nut butter is a very different calorie count from one loaded with several sweet toppings — the base ingredient is the same either way.

Are acai bowls healthy?

That's a health question rather than a factual one about what acai is, and it depends heavily on what's added to the bowl. See acai benefits: what the research does and doesn't show for what's actually been studied about the berry itself.

Where does acai come from?

The Amazon rainforest, primarily Brazil's Pará state, where Euterpe oleracea grows along rivers and floodplains and has been eaten locally for generations.

What is acai berry good for?

See acai benefits: what the research does and doesn't show — it covers the human research directly rather than the marketing claims built around the fruit.