Calories in a Lemon: Full Nutrition Breakdown
One whole lemon has about 17 calories. See the complete nutrition breakdown by serving size with expert FAQ.
Lemons are extremely low in calories and packed with vitamin C, making them one of the most nutrient-dense foods per calorie. While rarely eaten whole, lemon juice and zest are widely used to add flavor to dishes and drinks without adding significant calories.
Calories by serving size:
| Serving | Weight | Calories | Carbs | Sugar | Fiber | Vitamin C |
|---|---|---|---|---|---|---|
| Juice of 1 lemon | ~48 ml | 11 kcal | 4 g | 1 g | 0.2 g | 21% DV |
| 1 whole lemon (no peel) | ~58 g | 17 kcal | 5 g | 2 g | 1.6 g | 31% DV |
| 1 lemon wedge | ~8 g | 2 kcal | 1 g | 0.3 g | 0.2 g | 4% DV |
| 100 g | 100 g | 29 kcal | 9 g | 3 g | 2.8 g | 53% DV |
Beyond vitamin C, lemons contain citric acid, flavonoids (particularly hesperidin and d-limonene), and small amounts of potassium, folate, and vitamin B6. The citric acid in lemons may help prevent kidney stones.
Frequently Asked Questions (FAQ)
How many calories are in lemon juice?
The juice of one lemon (about 48 ml) contains approximately 11 calories. It provides 4 grams of carbohydrates and only 1 gram of sugar, along with 21% of your daily vitamin C. Lemon juice is one of the lowest-calorie ways to add flavor to water, salads, fish, and other foods.
Does lemon water help with weight loss?
Lemon water itself has very few calories — about 6 calories if you squeeze half a lemon into a glass. While lemon water is not a magic weight-loss solution, it can help by replacing higher-calorie beverages like soda or juice. Staying well-hydrated also supports metabolism. Some research suggests the polyphenols in lemons may help reduce weight gain, but more studies are needed.
Is lemon good for your immune system?
Lemons are an excellent source of vitamin C, which is essential for immune function. One whole lemon provides about 31% of the daily value. Vitamin C stimulates white blood cell production, enhances their ability to fight infections, and acts as an antioxidant protecting immune cells from damage. Regular vitamin C intake has been shown to reduce the duration of common colds.
Does lemon juice damage tooth enamel?
The citric acid in lemon juice has a pH of about 2, which can erode tooth enamel over time with prolonged contact. To minimize risk, drink lemon water through a straw, rinse your mouth with plain water afterward, and wait at least 30 minutes before brushing your teeth. Avoid holding lemon juice in your mouth or sipping it throughout the day.
What is the difference between lemons and limes nutritionally?
Lemons and limes are nutritionally similar, but lemons have slightly more vitamin C (53 mg vs. 29 mg per 100 g) and slightly more calories (29 vs. 30 per 100 g). Limes contain slightly more vitamin A. Both are excellent low-calorie sources of vitamin C and citric acid. The flavor difference is the main reason to choose one over the other.
How many calories are in lemon juice?
Does lemon water help with weight loss?
Is lemon good for your immune system?
Does lemon juice damage tooth enamel?
What is the difference between lemons and limes nutritionally?
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