Calories in Lemon: Nutritional facts for Lemon Types

One hundred grams (3.5 oz) of raw lemon without peel contains 29 calories.

One kilogram (2.2 lbs) of raw lemon without peel contains 290 calories.

The calorie content of one lemon depends on its size. One medium raw lemon (84 g or 3.0 oz without peel) contains 24 calories.

Lemon macros are computed based on laboratory analysis of the fruit's chemical composition. The base for computation is typically a standardized weight of the edible portion, such as 100 g of raw lemon without peel. During this process, the amounts of protein, total fat, and total carbohydrates are determined through various analytical methods. Carbohydrates are further broken down into sugars and dietary fiber. Calories are then calculated from these macronutrient values using standard conversion factors: protein and carbohydrates each provide 4 calories per gram, and fat provides 9 calories per gram. These factors are applied to the measured quantities of each macronutrient to determine the total caloric content of the lemon macros.

Lemons are well-known for their tart flavor and high Vitamin C content, offering a range of health benefits attributed to their rich array of vitamins, minerals, and plant compounds. Here are some key health benefits of lemon:

• Excellent Source of Vitamin C: Lemons are packed with Vitamin C, a powerful antioxidant that supports the immune system, helps protect cells from damage, and is essential for collagen production, aiding skin health and wound healing (Carr AC, Maggini S., 2017, "Vitamin C and Immune Function").
• May Improve Heart Health: Lemons contain flavonoids like hesperidin and diosmin, which have been associated with lowering cholesterol levels and improving blood vessel function. The Vitamin C content also contributes to cardiovascular health.
• Aids in Iron Absorption: The Vitamin C in lemons enhances the absorption of non-heme iron (iron from plant-based sources) when consumed together, which can help prevent iron-deficiency anemia.
• Supports Digestive Health: While acidic, lemon juice in water can sometimes stimulate digestion and aid in relieving indigestion or bloating for some individuals. The pectin fiber found in whole lemons can also promote gut health, although much of this is in the peel and pulp.
• May Help Prevent Kidney Stones: The citric acid in lemons can increase urine volume and urine citrate levels, creating a less favorable environment for the formation of calcium oxalate kidney stones (Penniston KL, Nakada SY, Holmes RP, Assimos DG., 2008, "Quantitative assessment of citric acid in lemon juice, lime juice, and commercially-available fruit juice products").
• Contains Beneficial Plant Compounds: Lemons are rich in various plant compounds, including flavonoids, limonoids, and phenolic acids, which possess antioxidant and anti-inflammatory properties. D-limonene, found in lemon peel oil, has been studied for its potential anticancer effects.
• May Aid in Weight Management: Some theories suggest lemon water can promote fullness, support hydration, and boost metabolism, potentially aiding weight loss efforts, though direct scientific evidence linking lemon water alone to significant weight loss is limited. The pectin fiber in whole lemons can also promote satiety.
• Promotes Hydration: Adding lemon to water can make it more palatable, encouraging increased fluid intake, which is essential for overall health.
• Supports Skin Health: The antioxidants in lemons, particularly Vitamin C, can help combat skin damage caused by free radicals and sun exposure, and contribute to a healthier complexion.
• May Freshen Breath: Lemon juice is thought to help kill bacteria in the mouth, which can contribute to bad breath. However, due to its acidity, it should be used with caution regarding tooth enamel.

While lemons offer many benefits, there are a few potential downsides, especially with excessive consumption or for certain individuals:

• Tooth Enamel Erosion: The high acidity of lemon juice can erode tooth enamel over time if consumed frequently and undiluted. Rinsing the mouth with plain water after consuming lemon juice can help mitigate this risk (Touyz LZ., 1994, "The acidity (pH) and erosive potential of fruit juice, wine, and other common beverages: an in vitro study").
• May Trigger Heartburn: For individuals with acid reflux or GERD (gastroesophageal reflux disease), the acidity of lemons can trigger or worsen heartburn symptoms.
• Canker Sore Irritation: The acidity of lemons can cause stinging and irritation if it comes into contact with canker sores in the mouth.
• Potential for Increased Migraine in Some Individuals: Citrus fruits, including lemons, are sometimes cited as potential triggers for migraines in susceptible individuals, though this varies greatly from person to person.

Yes, lemons are very good for you when consumed as part of a balanced diet. They are exceptionally rich in Vitamin C, a potent antioxidant crucial for immune function and skin health, and contain beneficial plant compounds like flavonoids, which also possess antioxidant and anti-inflammatory properties. A study by Fukuchi Y, et al. (2008), "Lemon Polyphenols Suppress Diet-induced Obesity by Up-regulation of mRNA Levels of the Enzymes Involved in beta-Oxidation in Mouse White Adipose Tissue," while an animal study, investigated the potential of lemon polyphenols in managing obesity. Their citric acid content may also help prevent kidney stones. Despite their acidity, when metabolized, lemons have an alkalizing effect on the body for some individuals, though this is a complex topic. Overall, the combination of high Vitamin C, antioxidants, and other phytonutrients makes lemons a healthy addition to foods and beverages.

Yes, lemon is a citrus fruit. Lemons belong to the genus Citrus, which is part of the Rutaceae family. This family includes other well-known fruits such as oranges, limes, grapefruits, mandarins, and pomelos. Are lemons citrus? Unquestionably. Their characteristic tartness, a high concentration of citric acid, aromatic peel rich in essential oils, and segmented pulp are all defining features of citrus fruits. The botanical classification firmly places lemon is a fruit or vegetable debate on the side of fruit.

The calorie content for the edible portion (pulp and juice) of different true lemon varieties, such as Eureka, Lisbon, and Bearss, is consistent, at around 29 calories per 100g. Meyer lemons, being a hybrid and slightly sweeter with lower acidity, might have a marginally different calorie count, possibly in the range of 25-30 calories per 100g, but this difference is minimal. The Ponderosa lemon, despite its large size, also shares a similar calorie density per 100g of flesh. Therefore, the primary factor affecting the total calories you get from a lemon is its size (total weight of edible portion), rather than significant inherent differences in calorie density between common true lemon varieties. The most significant calorie variation would come from consuming sweetened lemon products like lemonade or lemon-flavored desserts, not from the fresh fruit itself.

The lemon (Citrus limon) is believed to have originated in Assam (a region in northeast India), northern Burma, or China. It is thought to be a hybrid, possibly between a bitter orange and a citron. Lemons gradually spread westward through the Middle East to the Mediterranean region, likely with Arab traders around 700 CE. They were introduced to Europe, primarily Italy, around the 1st century CE during the time of Ancient Rome, but were not widely cultivated until later. Christopher Columbus is credited with bringing lemon seeds to the Americas on his voyages in the late 15th century. By the 18th century, lemons were being cultivated in Florida and California.

A simple yet historically significant preparation involving lemon, is its use to prevent and treat scurvy. Scurvy, a disease caused by Vitamin C deficiency, was rampant among sailors on long sea voyages who lacked access to fresh fruits and vegetables. In the mid-18th century, Scottish naval surgeon James Lind conducted one of the first recorded clinical trials, demonstrating that citrus fruits, including lemons and oranges, were effective in treating scurvy. This discovery led the British Royal Navy to eventually mandate the provision of lemon or lime juice to sailors, earning them the nickname "limeys." This practical application of lemon's nutritional properties had a profound impact on naval health and the feasibility of long-distance sea travel, highlighting lemon's importance beyond just culinary flavor.