Lemons, with their tangy zest and vibrant flavour, are a cornerstone in culinary dishes with their great versatility, but they also have a hidden health secret - their alkalising effects. In this article, we delve into the utility of alkalinity for metabolism and the role lemons play in promoting a balanced pH within our bodies. Most importantly, the alkalinity of lemons, once metabolised, has highly beneficial effects on overall health and well-being.

Despite its acidic nature, Lemon juice has alkalising effects on the body due to its unique metabolic properties. When consumed, lemon juice is metabolised, releasing alkaline byproducts into the bloodstream, which can help raise the body's pH levels, making it more alkaline. This shift towards alkalinity can support various bodily functions. 

These alkalising effects have been shown to improve digestion, enhance immune system function, and reduce the risk of inflammatory and chronic diseases.¹

Lemon juice has also been shown to improve skin complexion and appearance.²

Implementing lemon water into the diet has also been shown to support weight management and even weight loss.³

The pH scale 

To preface the explanation of the alkalising effects of lemons, the pH scale should be considered. It ranges from 0, the most acidic, to 14, categorising the most alkaline substances, with 7 being neutral. To note, water is pH 7, and can be said to be a perfect balance between acidic and alkaline. pH balance is pivotal for many bodily functions, from enzyme activity to cellular processes. It significantly influences the body's ability to resist diseases.⁴ 

Acidity and alkalinity 

Acidity and alkalinity are opposites on the pH scale. Foods and more acidic substances can lower the body's pH, potentially causing health issues, while alkaline substances can raise pH levels, promoting better health.

Moreover, the optimal pH level varies depending on the body organ or location in question. For example, the saliva in the mouth works optimally at a pH between 6.5 - 7.5, but by the time food reaches the stomach, the pH needs to reduce to around 1.5-3.5, for digestion significantly.⁵ 

Lemon composition

Lemons are packed with a complex array of compounds, each playing a role in their alkalising effects. The primary components include citric acid, vitamin C, various phytochemicals, essential oils, and bioactive compounds. However, lemons' true and unique benefits are rooted in how these compounds behave within the body.⁶

Citric acid

Citric acid is one of the most abundant components in lemons, giving lemon juice its sour taste. Despite it being an acid, its effects are alkalising. This is because, once ingested, it is broken down and metabolised into alkaline byproducts. This helps to raise the body's pH levels.⁷

Vitamin C

Lemons contain a huge diversity of vitamins. To list a few, lemons contain significant folate, vitamin B6, and thiamine levels. These vitamins are all proven to assist general health. However, lemons are easily categorised into fruits containing high amounts of vitamin C. Also known as ascorbic acid, this essential vitamin supports the immune system, aids in collagen production for healthy skin, and acts as a potent antioxidant, protecting cells from oxidative damage.⁸

Lemons are also abundant sources of minerals, such as potassium. Potassium is vital in a healthy diet due to its effects on maintaining electrolyte balance and muscle function.⁹

Phytochemicals

Lemons contain various phytochemicals, including flavonoids and limonoids, which have antioxidant and anti-inflammatory properties. These compounds contribute to the potential health benefits of lemons.¹⁰ 

Essential oils

Lemon peel contains essential oils, primarily limonene, which not only contribute to the citrusy aroma and flavour but also have potential health benefits, including antimicrobial properties.¹¹

Bioactive compounds

Beyond their primary components, lemons are rich in bioactive compounds with potential health benefits. For example, the antioxidant properties of lemon compounds can help protect cells from damage and combat oxidative stress.

However, it's essential to remember that the concentration of these compounds can vary slightly depending on factors like the lemon's ripeness and growing conditions, but lemons, as a whole, are a nutrient-dense and versatile fruit.¹²

The paradox of citric acid

It might appear counterintuitive that citric acid has a powerful alkalising effect. However, when metabolised, citric acid has an intriguing property. It can contribute to an alkaline shift in the body, making lemons a prime candidate for promoting alkalinity.

The alkalizing effects of lemons

Lemon juice can influence the body's pH balance. This happens due to the buffering capacity of citric acid. When consumed, citric acid is metabolised, releasing alkaline byproducts, helping to raise the body's pH levels. Several studies support this claim, showing that lemon consumption can significantly impact the body's acid-base balance.

When you consume lemon juice, the citric acid enters your stomach. The acidic environment in the stomach aids in breaking down the citric acid and releasing its components. The metabolic process of citric acid can be explained in several steps, beginning with hydrolysis. Hydrolysis, in which water reacts with the substance for the breakdown of the original substance, occurs with citric acid. One by-product of this reaction is citrate ions. 

Citrate ions are transported into the kidneys through the bloodstream. At the kidneys, the lemon juice can now begin its journey of alkalisation in the body. This is because they are converted into bicarbonate, a highly alkaline substance. This is a further step in metabolism and may explain how lemon juice can transform into an inherently acidic compound, into a substance with a high pH value. However, the true effect on the body’s pH occurs when the bicarbonate ions are released back into the bloodstream. If the bicarbonate is absorbed by body cells, the pH increases.¹³

However, acidity is achieved when acid is not excreted in the urine and bicarbonate is present due to a lack of absorption. 

This metabolic process is essential for maintaining the body's acid-base balance. The bicarbonate ions generated from citrate metabolism help neutralise excess acid in the body, playing a crucial role in buffering acidic substances.¹⁴ As a result, lemon juice consumption can promote a more alkaline environment within the body.

Health benefits of alkalinity

The alkalising effects of lemons come with various health benefits:

Improved digestion and nutrient absorption

A balanced pH supports optimal enzyme activity, which is essential for digestion and the absorption of vital nutrients. Enzymes tend to function more efficiently in

slightly alkaline environments in the small intestine. Also, an alkaline environment enhances the effects of bile. Bile, essential for emulsifying fats in the small intestine, is secreted more effectively in alkaline environments. Fat emulsification is vital for enzyme activity to break down fats.¹⁵

Enhanced immune system function

A balanced pH is key to maintaining a robust immune system, aiding the body's defence against diseases. In more alkaline environments, immune cells, including T, B, and macrophages, are optimally active. Therefore, these cells can perform their roles more effectively, such as recognising and targeting pathogens or infected cells. These shifts in pH also lend themselves to increased efficiency of phagocytosis. Phagocytosis is a critical process in which immune cells engulf and digest invading pathogens.¹⁶

This can also create a decreased level of inflammation. Alkalinity can help reduce chronic inflammation, which, when excessive, can weaken the immune system. Chronic inflammation can impair immune cell function and contribute to various diseases. An alkaline environment can mitigate inflammation, allowing immune cells to focus on protecting the body from pathogens.¹⁷

Alkaline environments also promote detoxification, essential for eliminating toxins and metabolic waste products that can hinder immune function. Vitamin C has also been shown to reduce oxidative stress: Alkaline conditions can help reduce oxidative stress, a state in which harmful free radicals accumulate and cause damage to cells, including immune cells (. Lowering oxidative stress can enhance the immune system's ability to combat infections and diseases. These immune system benefits can also be seen in improving lymphatic system function. This system plays a crucial role in immune function by transporting immune cells and fluids throughout the body. Alkaline conditions can support the optimal function of the lymphatic system.¹⁸

Lemon water and alkalinity

Lemon water is a simple and effective way to harness the alkalising effects of lemons. To prepare this elixir, mix fresh lemon juice with water. The recommended daily intake to optimise alkalinity without overdoing it is typically one to two glasses a day.¹⁹

The alkaline diet and lemons

Incorporating lemons into an alkaline diet is easy. They can be added to various dishes, providing a zesty kick while promoting alkalinity. Other alkaline-promoting foods include leafy greens, nuts, and seeds. It's essential to balance acidic and alkaline foods for overall pH equilibrium.²⁰

Summary

In conclusion, lemons are more than just a flavourful addition to your meals. Their alkalising effects can significantly impact your health. Understanding the dynamics of pH balance and the role of lemons in promoting alkalinity is a simple and accessible way to support overall well-being. Consider incorporating lemons and lemon water into your daily routine to reap the benefits of a balanced pH. Remember, this citrusy elixir can be a refreshing boost for your health and vitality.

FAQs

Aren’t lemons and citrus fruits acidic? 

Lemons and citrus fruits (high in citric acid) are naturally acidic. However, the real alkalising effects can only be harnessed upon ingestion. The metabolism of these fruits gives them the ability to restore pH balance once in the body. 

What about the effects of lemon juice on my teeth? 

As lemon juice is still acidic before its breakdown in the body, its acidic properties can affect dental health. Drinking lemon juice in high amounts can result in erosion of the enamel, which lends itself to tooth sensitivity and even discolouration of the teeth. 

If you are to implement lemon water or increase your consumption of lemon juice, it is important to dilute the juice with water to reduce the acidity and consider drinking through a straw. Furthermore, brush your teeth at least 30 minutes after consumption, as brushing immediately can expedite these effects.