Dragon Fruit Nutrition Calculator — Calories, Betalains & Minerals per Serving

Dragon fruit (FDC 173942 — pitaya, raw) delivers 60 calories per 100g with 1.18g protein, 0.4g fat, and 12.94g carbohydrates including 8g sugars and 3g fiber. The calorie count is moderate for a tropical fruit — higher than papaya (43 kcal) but lower than banana (89 kcal) or mango (60 kcal) ^[1].

The standout value is iron at 3.57mg per 100g (20% DV) — extraordinarily high for a fruit. For comparison: spinach has 2.7mg, banana 0.26mg, and apple 0.12mg per 100g. One cup of dragon fruit cubes (~227g) delivers 8.1mg iron (45% DV) — more than a 3oz serving of beef (2.6mg). This makes dragon fruit one of the highest-iron fruits in the USDA database ^[1][2].

Magnesium at 40mg per 100g (10% DV) is another distinguishing mineral — higher than most fruits and comparable to cooked quinoa (64mg). A cup of cubes provides 91mg magnesium (22% DV). Combined with the iron, dragon fruit has a mineral profile more reminiscent of leafy greens than typical fruits ^[1][2].

Red-fleshed dragon fruit (Hylocereus polyrhizus) gets its vivid magenta color from betalains — a completely different class of pigments from the anthocyanins found in blueberries, grapes, and cherries. Betalains are present only in plants of the Caryophyllales order (which includes cacti, beets, and amaranth) and are mutually exclusive with anthocyanins — no plant produces both ^[2][3].

Research has measured betalain concentrations of 10-80mg per 100g in red-fleshed dragon fruit, depending on variety and ripeness. The two main betalain types are betacyanins (red-violet) and betaxanthins (yellow-orange). White-fleshed dragon fruit (H. undatus) contains primarily betaxanthins at much lower concentrations, which is why it appears pale ^[2][3].

Yellow dragon fruit (Selenicereus megalanthus) — the small, prickly-skinned variety — has white flesh with no significant betalain content but is often considered the sweetest variety. The USDA's single entry (FDC 173942) represents an average across commercial varieties; specific betalain measurements are tracked in research literature rather than USDA nutrient panels ^[2][3].

Dragon fruit's 3g fiber per 100g (11% DV) primarily comes from the hundreds of tiny black seeds embedded throughout the flesh. These seeds are small enough to eat without chewing but contribute meaningful fiber — both soluble (from the gel-like seed coat) and insoluble (from the seed shell). One cup delivers 6.8g fiber (24% DV) ^[1][2].

The seed density is remarkably high: approximately 1,000-2,000 seeds per fruit. Research has analyzed these seeds and found they contain small amounts of essential fatty acids (linoleic and linolenic acid) in the seed oil. However, the seeds are so tiny that the fat contribution is minimal — total fat in dragon fruit is only 0.4g per 100g ^[2][3].

Vitamin C at 4mg per 100g is disappointingly low for a tropical fruit — dragon fruit provides only 4% DV while mangoes deliver 36mg (40% DV) and papayas 61mg (68% DV). Dragon fruit's nutritional strengths are its iron, magnesium, fiber, and betalain content — not its vitamin profile ^[1].

In a smoothie bowl context, dragon fruit (60 kcal/100g) is often used interchangeably with açaí (70 kcal), mango (60 kcal), or papaya (43 kcal). The calorie comparison is close, but the mineral profiles diverge significantly: dragon fruit has 3.57mg iron while mango has 0.16mg, papaya 0.25mg, and even açaí only 0.6mg per 100g ^[1].

Fiber rankings: dragon fruit (3g) sits between papaya (1.7g) and mango (1.6g) — lower than guava (5.4g) and passion fruit (10.4g). For a tropical fruit smoothie bowl focused on fiber, guava or passion fruit additions would complement dragon fruit better than mango ^[1].

The visual appeal of red dragon fruit (bright magenta) has made it an Instagram-era smoothie bowl staple, but the nutritional contribution is genuinely strong: the 8.1mg iron per cup is its most compelling nutrient number and isn't matched by any common smoothie bowl fruit ^[1][2].