Lowest-Calorie Fruits: 9 of the Lightest

Short answer: The lowest-calorie fruits are the watery ones. Ash gourd leads at about 13 kcal per 100 g, with bottle gourd at 14, cucumber at 15, bitter melon and zucchini at 17, tomato at 18 and chayote at 19 — all under 20. Watermelon and cantaloupe follow at roughly 30-35 kcal. Several of these are botanical fruits eaten as vegetables, which is exactly why they are so light: they never developed the sugar. The compare table below lists each real figure per 100 g.

  🟢 Ash gourd🫙 Bottle gourd🥒 Cucumber🥒 Zucchini🥒 Bitter melon🍅 Tomato🟢 Chayote🍉 Watermelon🍈 Cantaloupe
Taste Very mild and faintly sweet with a soft, translucent, watery flesh when cooked; almost flavorless raw, it absorbs broths and syrups, becoming silky in soup or candied into chewy-crisp sweets.Extremely mild and faintly sweet, with soft white flesh that absorbs whatever it is cooked with — closer to a very delicate marrow than to anything assertive. Bitterness is a warning sign, not a flavour note.Mild, green and faintly melon-like, with a clean watery crunch and a cool finish. The skin carries most of the flavour and a slight bitterness; the seeds are soft and edible in young fruit.Very mild, faintly green and grassy, with a soft-crisp flesh that turns silky when cooked. Larger fruit becomes watery and seedy; small zucchini are firmer and sweeter, and the flowers are delicately nectar-sweet.Intensely, distinctively bitter — the whole point of the fruit — with a crisp, cucumber-like flesh; salting, blanching, and cooking mellow it, and its bitterness is prized as an appetite-sharpening, cooling quality.Sweet-acid balance over a deep savory umami base (tomatoes are rich in natural glutamate); great ones taste sun-warmed and complex, refrigerated ones taste of nothing — the cold kills the aroma enzymes.Very mild and faintly sweet with a crisp, watery, cucumber-meets-squash flesh; it takes on the flavors it's cooked with, refreshing raw and tender when cooked, with a single flat edible seed.Crisp, watery, and cleanly sweet with a faint cucumber freshness (they're family). Yellow varieties add honey notes; the flesh nearest the seeds is the sweetest.Sweet, musky, and floral with tender, dripping flesh; a great one is almost tropical. Underripe cantaloupe tastes like cucumber's boring cousin — this fruit lives and dies by ripeness.
Type MelonMelonMelonMelonMelonBerryMelonMelonMelon
Peak season Autumn, WinterSummer, AutumnSummerSummerSummerSummer, Year-roundAutumn, WinterSummerSummer
Origin South and Southeast AsiaAfrica, but carried across the world in prehistory — archaeological finds place it in the Americas and Asia thousands of years agoThe Indian subcontinent; cultivated for over 3,000 years and carried west by Roman tradeThe species is Mesoamerican; the zucchini itself was bred in 19th-century northern ItalySouth Asia and tropical Africa; spread across Asia and the CaribbeanAndean South America (Peru/Ecuador); domesticated in MesoamericaMesoamerica (Mexico and Central America)Northeastern Africa (Sudan/Kalahari region), cultivated in Egypt 4,000+ years agoLikely Africa or South Asia; named for the papal estate at Cantalupo, Italy, where it was grown from the 1700s
Calories (per 100 g) 131415171718193034
Sugar (per 100 g) 1.5 g—1.67 g2.5 g1 g2.6 g1.7 g6.2 g7.9 g
Vitamin C (per 100 g) 13 mg10.2 mg2.8 mg17.9 mg84 mg13.7 mg8 mg8.1 mg36.7 mg
Fiber (per 100 g) 2.9 g0.5 g0.5 g1 g2.8 g1.2 g1.7 g0.4 g0.9 g
Potassium (per 100 g) —150 mg147 mg261 mg—237 mg125 mg112 mg267 mg
Typical price BudgetBudgetBudgetBudgetBudgetBudgetBudgetBudgetBudget

If you’re watching calories, the lightest fruits are the watery, low-sugar ones — many of them culinary ‘vegetables’. These nine are among the lowest, and the table below shows each one’s real calorie figure per 100 g so you can compare directly.

At the very bottom sit ash gourd (winter melon, ~13 kcal), bottle gourd (~14), cucumber (~15), bitter melon and zucchini (~17 each), tomato (~18) and chayote (~19) — all mostly water, low in sugar, and all botanical fruits that we treat as vegetables. That is not a coincidence: a fruit only accumulates sugar to bribe an animal into spreading its seeds, and these are the ones that never went in for it.

For something sweet and snackable, watermelon and cantaloupe are the classic light choices at roughly 30–35 kcal per 100 g — over 90% water in watermelon’s case. All nine fill you up and hydrate you for very little energy, which makes them handy snacks; just pair them with more nutrient-dense fruits so variety doesn’t suffer.

Frequently asked questions

What is the lowest-calorie fruit?

Ash gourd (winter melon) is the lightest in our collection at around 13 kcal per 100 g, with bottle gourd at 14, cucumber at 15, bitter melon and zucchini at 17, tomato at 18 and chayote at 19 just behind. All are watery, low-sugar botanical fruits usually eaten as vegetables. Among the sweet, snackable fruits, watermelon and cantaloupe are the lightest at roughly 30–35 kcal.

Why are these fruits so low in calories?

They're mostly water and low in sugar. A fruit's calories come mainly from its sugar and, occasionally, fat; the watery, low-sugar ones like melons and gourds simply have less of both. That high water content also makes them filling and hydrating for very few calories.

Are low-calorie fruits good for weight loss?

They can help — high water and fibre content means they fill you up for very little energy, making them satisfying snacks. But calories aren't everything: nutrient variety matters, so mix these lighter fruits with more substantial ones rather than eating only the lowest-calorie options.

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