Cucumber calories per 100g: 15 kcal

Cucumber Nutrition Analysis: The Ultimate Hydration Food

The cucumber is a refreshing, low-calorie botanical food. Cultivated extensively worldwide, cucumbers are botanically classified as a fruit due to their seed structure, yet consumed and categorized nutritionally as a vegetable. Given their low caloric footprint, they serve as an excellent option for individuals maintaining a caloric deficit, allowing for volume snacking without significantly impacting daily macronutrient budgets. To log your vegetable snacks, the CalMind photo calorie tracker lets you scan a bowl of cucumber slices for accurate nutrition data.

A standard 100-gram serving of raw, unpeeled cucumber provides 15 calories. Approximately 96% of its composition consists of water. The minimal solid mass provides roughly 3.6 grams of carbohydrates, 0.7 grams of dietary protein, and 0.1 grams of fat. Keeping the dark green outer peel intact provides over 0.5 grams of dietary fiber per serving.

The Strategic Role of Volume and Satiety

While cucumbers are low in macronutrients, their value lies in their gastric volume. Eating a medium-sized raw cucumber (weighing roughly 200 grams) distends the stomach lining while delivering only 30 total calories. This physical stretch triggers mechanoreceptors lining the stomach wall. These receptors send satiety signals to the brain, helping to manage hunger without consuming dense calories.

Electrolyte Balance and Cellular Hydration

Because a cucumber is 96% water, it acts as a natural hydration source. Consuming water-dense foods like cucumbers delivers hydration and trace minerals directly into the digestive system.

Cucumbers naturally provide dietary potassium and trace magnesium. These intracellular electrolytes help maintain cellular fluid balance. Adding fresh cucumber slices to your water or blending them into smoothies creates a hydration option that supports optimal fluid balance.

Antioxidants Hidden Inside the Peel

Much of the nutritional value of a raw cucumber—excluding the water—is located inside its dark green external peel. Removing this skin reduces the intake of its plant-based phytonutrients. The intact peel serves as a source of Vitamin K, a fat-soluble nutrient important for blood clotting and bone metabolism.

Furthermore, the skin provides fisetin, a bioactive flavonol. Research suggests fisetin may offer neurological protection against cellular oxidative stress and support long-term memory function. When consuming raw cucumbers, ensure you wash the exterior thoroughly to remove any surface coatings or residues.

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