Arecanut (Betel Nut) Calories & Nutrition Calculator

Dried arecanut contains 15–25% condensed tannins (proanthocyanidins) by weight — one of the highest tannin concentrations among commonly consumed plant materials. For comparison: unripe persimmon has ~2–5% tannins, black tea 10–20%, and cacao beans 6–8%. The tannins create arecanut's distinctly astringent, drying mouthfeel that is central to its sensory experience ^[1][2].

These polyphenolic compounds are entirely invisible to standard nutrition databases. Neither IFCT 2017 nor USDA FoodData Central track tannin content. The tannins interact with dietary iron and protein — a compositional characteristic that distinguishes arecanut from other nuts where tannins are present at much lower levels ^[1].

For food journaling, arecanut's tannins are the dominant non-nutritive compound by weight. In a 3g piece of dried supari, approximately 0.45–0.75g is tannin material — more than the protein (0.16g) or fat (0.25g) content of that same piece.

Dried arecanut provides 16.9g dietary fiber per 100g (60% DV) — comparable to almonds (12.5g) and higher than cashews (3.3g) and coconut meat (9.0g). The fiber is predominantly insoluble, arising from the lignified cell walls of the dense seed endosperm. This structural fiber is what makes arecanut hard enough to require prolonged chewing ^[1][3].

Per dried piece (3g): 0.51g fiber (1.8% DV). Per two pieces (6g): 1.01g (3.6% DV). Fresh tender arecanut has significantly less fiber per gram due to higher water content — approximately 5.7g fiber per 100g of fresh nut ^[1].

For food journaling, arecanut fiber is structurally distinct from the soft, soluble fibers found in fruits and oats. The dense, hard matrix means the fiber passes through largely intact. Whether this behaves identically to other dietary fibers during digestion is a subject of ongoing research.

Dried arecanut contains 5.4mg iron per 100g (30% DV) — placing it in the mid-range among nuts and seeds. Sesame seeds lead at 14.6mg, cashews have 6.7mg, almonds 3.7mg, and coconut meat just 2.4mg. Arecanut's iron sits comfortably between these common comparators ^[1][2].

Per dried piece (3g): 0.16mg iron (0.9% DV). Per two pieces (6g): 0.32mg (1.8% DV). These per-serving contributions are small — the iron is notable as a compositional characteristic rather than a practical dietary source at typical portion sizes ^[1].

For food journaling, the iron in arecanut should be understood in context: the high tannin content may affect iron availability. Tannins are known to bind non-heme iron, potentially reducing its absorption. This interaction means the 5.4mg per 100g may not be fully bioavailable.

Arecoline — a pyridine alkaloid — is the primary bioactive compound in arecanut, present at 0.1–0.5% of dried nut weight (1–5mg per gram). Secondary alkaloids include arecaidine, guvacoline, and guvacine, collectively constituting an alkaloid profile unique to *Areca catechu*. No other commonly consumed food contains these specific compounds ^[1][2].

A single dried supari piece (3g) contains approximately 3–15mg of arecoline — a significant amount of a bioactive compound that is completely absent from USDA, IFCT, or any standard food composition database. The alkaloid content varies substantially between fresh (higher arecoline) and processed/dried forms (lower, due to degradation during drying) ^[2][3].

For food journaling, arecoline is the compound that defines arecanut's identity — analogous to caffeine in coffee or piperine in pepper. Standard nutrition tracking captures the macros and minerals but entirely misses the compound that makes arecanut culturally and sensorially distinctive.

A single piece of dried supari (approximately 3g) provides: 10 kcal, 0.16g protein, 1.73g carbs, 0.25g fat, 0.51g fiber, 1.32mg calcium, 0.16mg iron, and 6.2mg potassium. Two pieces (6g): 20 kcal, 0.32g protein, 1.02g fiber, 0.32mg iron ^[1].

Fresh tender arecanut is heavier per unit (~15g edible per whole nut) but lower in nutrient concentration: one fresh nut provides approximately 17 kcal, 0.27g protein, 2.9g carbs, 0.42g fat, and 0.86g fiber. The choice between fresh and dried affects both the weight logged and the nutrient density ^[1].

For food journaling, arecanut at typical 1–2 piece consumption contributes 10–20 kcal and negligible micronutrients. The caloric and nutritive impact is minimal; the primary compositional interest lies in the tannin and alkaloid content, neither of which appears on any nutrition panel.