The Truth About Lemon Juice: Weight Loss and Health Risks Explained - Nutrition

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Therapeutic Effects of Lemon Juice


I previously read a book that stated drinking the juice of one lemon mixed with 500 cc of water and a pinch of salt on an empty stomach every day for about six months could lead to a weight loss of up to 9 kilograms and could also change an acidic body condition.
However, after trying this for about a week, I was sent to the emergency room, and the doctor diagnosed me with acute gastroenteritis.
I'm not sure if this was caused by the lemon water.
Regarding what the book claims, can it really aid in weight loss and improve body condition? Since I already have an acidic body condition, could you also advise me on how to change it to an alkaline state? Thank you!

sasa, 20~29 year old female. Ask Date: 2003/08/02

Dr. Ke Qiuliang reply Nutrition


Hello! I apologize for the delay due to my busy work schedule.
Regarding your mention of drinking lemon juice on an empty stomach, some individuals may find it difficult for their stomachs to handle, which can lead to gastrointestinal discomfort.
If you really want to drink it, I suggest having it after meals instead.
For healthy weight loss, I recommend focusing on a balanced diet and consulting a qualified nutritionist for weight loss advice.

Acidic foods refer to those that produce more anions than cations after digestion and metabolism, while the opposite indicates alkaline foods.
Our body has a robust acid-base buffering system that maintains the pH balance of bodily fluids, so I still recommend having a balanced diet.
Generally speaking, most animal-based foods, except for milk, are acidic, while most plant-based foods are alkaline, with the exception of rice.
Coffee, salt, and tea are considered neutral foods.

Reply Date: 2003/08/02

More Info


Lemon juice has gained popularity as a health tonic, often touted for its potential weight loss benefits and ability to alter body pH levels. However, the claims surrounding its effectiveness and safety warrant careful examination, especially in light of your experience with acute gastroenteritis after consuming lemon juice mixed with water and salt.

First, let's address the notion of using lemon juice for weight loss. While lemon juice is low in calories and can be a flavorful addition to water, the idea that it can lead to significant weight loss—such as the 9 kg mentioned in your source—should be approached with skepticism. Weight loss fundamentally occurs when there is a caloric deficit, meaning you consume fewer calories than your body expends. Relying solely on lemon juice or any single food item for weight loss is not a sustainable or healthy approach. Instead, a balanced diet that includes a variety of nutrients, combined with regular physical activity, is the most effective way to achieve and maintain a healthy weight.

Regarding the claim that lemon juice can change your body from an acidic to an alkaline state, it is essential to understand how the body regulates pH levels. The human body has a robust system for maintaining acid-base balance, primarily through the kidneys and lungs. While certain foods can influence urine pH, they do not significantly alter the overall pH of the blood or body tissues. The concept of "acidic" versus "alkaline" foods is often oversimplified and can lead to misconceptions. Instead of focusing on altering your body's pH, it is more beneficial to consume a balanced diet rich in fruits, vegetables, whole grains, lean proteins, and healthy fats.

Your experience of developing acute gastroenteritis after consuming lemon juice may be linked to several factors. Drinking lemon juice on an empty stomach can irritate the gastrointestinal tract, especially for individuals with sensitive stomachs or pre-existing conditions. The acidity of lemon juice can exacerbate symptoms of gastritis or lead to discomfort in some people. Additionally, adding salt to the mixture may not be advisable, as excessive sodium intake can also contribute to gastrointestinal issues. If you wish to continue consuming lemon juice, consider diluting it further and consuming it after meals rather than on an empty stomach to minimize potential irritation.

In terms of improving your overall health and well-being, I recommend consulting with a registered dietitian or nutritionist who can provide personalized guidance based on your dietary preferences, health status, and weight loss goals. They can help you develop a balanced meal plan that meets your nutritional needs while supporting your weight loss efforts.
In summary, while lemon juice can be a refreshing and low-calorie beverage, it should not be viewed as a miracle solution for weight loss or health improvement. A holistic approach that includes a balanced diet and regular exercise is the most effective way to achieve lasting results. Always listen to your body and consult healthcare professionals when making significant changes to your diet, especially if you experience adverse effects.

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