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Watermelon and weight loss: the lowest-calorie fruit we list

  • 40 kcal in 2 cups cubes, about 200 g.
  • 1.2 g protein per serving, from IFCT 2017.
  • Whole fruit on a plate built to lose fat and keep muscle.
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A woman smiles as she arranges a plate of sprouts, cucumber and fruit chaat

Watermelon is one of the easiest fruits to fit into a weight-loss plan. Two cups (200 g) give just 40 kcal and 7.7 g of carbohydrate. It is mostly water, so a big, cold bowl satisfies a sweet craving for almost nothing.

Watermelon nutrition, per serving and per 100 g

Watermelon: IFCT 2017 figures
NutrientPer servingPer 100 g
Energy40 kcal20 kcal
Protein1.2 g0.6 g
Carbohydrate (available)7.7 g3.9 g
Dietary fibre1.4 g0.7 g
Fat0.3 g0.2 g

Serving: 2 cups cubes, about 200 g. IFCT 2017 food code E065, "Water melon, dark green (sugar baby)", the mean of 6 regions sampled. IFCT does not report glycaemic index, so this page prints none.

The verdict on watermelon

Whole fruit

One counted fruit in place of a sweet or a packet snack.

  • 3 g of protein for every 100 kcal.
  • One serving gives 1.2 g of the roughly 58 g of protein a day ICMR-NIN's RDA sets for a 70 kg adult.
  • 1.4 g of fibre in a serving.

How watermelon fits a plan that loses fat and keeps muscle

IFCT 2017 lists dark-green (sugar baby) watermelon at 20 kcal per 100 g, the lowest of any fruit in our list. That makes it ideal in summer, when a large portion fills you up and keeps you hydrated.

Glycaemic index is the question people ask most about watermelon. IFCT does not measure it; what matters on a plate is that a two-cup bowl carries only 7.7 g of carbohydrate. Pair it with protein if it is a snack on its own.

Watermelon in an Indian kitchen

Choose a heavy watermelon with a creamy-yellow patch where it rested on the ground. Cut it into cubes and keep a box in the fridge; a bowl of cold watermelon is one of the most filling summer snacks for its calories, because it is mostly water. Watermelon with mint and a squeeze of lime, or tossed with cucumber and a little paneer, makes a light salad. Juice from a cart often has added sugar and ice.

Pair it, or swap it

Watermelon with a little paneer or feta and mint is a refreshing salad. Watermelon after a protein-rich lunch makes an easy dessert.

Worth knowing

Watermelon juice removes what little fibre the fruit has and is easy to drink in large amounts.

Watermelon against similar foods

Per 100 g, IFCT 2017
FoodEnergyProteinFibre
Watermelon20 kcal0.6 g0.7 g
Watermelon, pale green17 kcal0.6 g0.8 g
Muskmelon28 kcal0.5 g1.5 g
Papaya24 kcal0.4 g2.8 g

Watermelon: questions people ask

What is the glycaemic index of watermelon?

IFCT 2017 does not report glycaemic index, so we do not print one. A two-cup bowl carries 7.7 g of carbohydrate.

Is watermelon good for weight loss?

Yes. Two cups give about 40 kcal per IFCT 2017, so it fills a bowl for very little.

Can I eat watermelon every day?

Yes, in season. A bowl a day fits most plans.

Sources

  1. [1] Longvah T, Ananthan R, Bhaskarachary K, Venkaiah K. Indian Food Composition Tables 2017

    National Institute of Nutrition (ICMR), Hyderabad, 2017. Table 1, Proximate Principles and Dietary Fibre: energy, protein, fat, available carbohydrate and dietary fibre per 100 g edible portion, the mean of the regions sampled. Every figure on this page comes from it.

    Read the source
  2. [2] ICMR-National Institute of Nutrition. Dietary Guidelines for Indians

    ICMR-NIN, Hyderabad, 2024. Recommends combining cereals with pulses in a 3:1 ratio for protein quality, meeting vegetarian protein needs from pulses, beans and milk, keeping added sugar under 5% of energy and salt to 5 g a day, and slow, steady weight reduction.

    Read the source
  3. [3] ICMR-NIN Expert Group on Nutrient Requirements for Indians. Recommended Dietary Allowances and Estimated Average Requirements

    ICMR-NIN, Hyderabad (brief note), 2020. Sets the protein RDA for healthy Indian adults at 0.83 g per kg of body weight a day, and 1 g per kg for people on a cereal-based diet with lower-quality protein.

    Read the source
  4. [4] Wycherley TP, et al. Effects of energy-restricted high-protein, low-fat compared with standard-protein, low-fat diets: a meta-analysis of randomized controlled trials

    American Journal of Clinical Nutrition, 2012. In energy-restricted trials, higher-protein diets produced slightly greater fat loss and better preservation of fat-free mass than standard-protein diets.

    Read the source
  5. [5] Shukla AP, et al. Food Order Has a Significant Impact on Postprandial Glucose and Insulin Levels

    Diabetes Care, 2015. Eating vegetables and protein before carbohydrate in the same meal produced lower post-meal glucose and insulin than the reverse order, in a small crossover study.

    Read the source

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