Balancing Acidic and Alkaline Foods for Optimal Health - Nutrition

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Acidic and Alkaline Foods


Hello, Dietitian Tang.
I would like to ask the following questions:
1.
Is it true that individuals with a tendency to develop kidney stones and high uric acid levels have an acidic body constitution?
2.
If one has an acidic body constitution, is it necessary to consume more alkaline foods to neutralize the body's pH and facilitate the excretion of uric acid?
3.
Could you provide examples of acidic and alkaline foods? Are commercially available plum vinegar drinks considered highly alkaline, and can they be consumed in large quantities?
4.
If one consumes too many alkaline foods, could it be harmful to the body?
Thank you, Dietitian Tang.
Best regards.

Ala, 60~69 year old female. Ask Date: 2002/09/16

Dr. Tang Weili reply Nutrition


1.
The body's blood pH is maintained between 7.35 and 7.45, regulated by the kidneys to prevent acid-base disorders.
Kidney stones are unrelated to this, and it is advisable to drink plenty of water.
2.
Dietary intake should focus on a balanced diet, as the acidity of urine is related to sodium excretion.
When uric acid levels are high, a low-purine diet should be adopted to avoid competition for excretion with lactic acid produced from fat and alcohol metabolism, and it is important to drink plenty of water.
3.
Acidic foods include meat, fish, eggs, and refined grains, while alkaline foods include vegetables, fruits, and milk.

Reply Date: 2002/09/16

More Info


Balancing acidic and alkaline foods is a topic of great interest, especially for individuals concerned about their health, such as those with a history of kidney stones or high uric acid levels. Let's delve into your questions regarding the relationship between body pH, diet, and overall health.

1. Understanding Acidic Body Conditions: The concept of "acidic body" often refers to a state where the body's pH levels are lower than optimal. However, it's essential to clarify that the body has sophisticated mechanisms to regulate pH levels, particularly in the blood, which typically ranges from 7.35 to 7.45. Conditions like kidney stones and high uric acid levels can be influenced by diet, but they are not solely indicative of an "acidic body." Instead, they may reflect dietary choices, hydration levels, and genetic predispositions.

2. The Role of Alkaline Foods: If you are concerned about high uric acid levels, incorporating more alkaline foods into your diet can be beneficial. Alkaline foods, such as fruits (especially citrus fruits), vegetables (like spinach and kale), nuts, and seeds, can help promote a more balanced internal environment. While it's not strictly necessary to "neutralize" acidity with alkaline foods, a diet rich in these foods can support overall health and may help in managing uric acid levels.

3. Identifying Acidic and Alkaline Foods: Generally, foods are classified based on their potential renal acid load (PRAL). Foods that are typically considered acidic include meats, fish, dairy, and processed foods, while alkaline foods include most fruits and vegetables. As for your question about commercial plum vinegar drinks, they can vary in their pH levels depending on their ingredients. While some vinegar drinks may have health benefits, they should be consumed in moderation, especially if they are high in sugar or additives.

4. Potential Risks of Excessive Alkaline Foods: While consuming alkaline foods is generally safe and beneficial, overconsumption of any food group can lead to imbalances. For instance, excessive intake of certain alkaline foods, like spinach or beet greens, can lead to an overload of oxalates, which may contribute to kidney stone formation in susceptible individuals. Balance is key; a varied diet that includes a wide range of food groups is essential for optimal health.

5. Additional Strategies for Balancing pH: Besides dietary adjustments, staying well-hydrated is crucial for maintaining healthy kidney function and uric acid levels. Drinking plenty of water helps dilute uric acid in the bloodstream and promotes its excretion through urine. Regular physical activity and maintaining a healthy weight can also support metabolic health and reduce the risk of conditions associated with high uric acid levels.

In conclusion, while the idea of balancing acidic and alkaline foods can be a helpful framework for making dietary choices, it's essential to focus on a well-rounded diet rich in whole foods, adequate hydration, and overall lifestyle factors. If you have specific health concerns, such as kidney stones or high uric acid levels, consulting with a healthcare professional or a registered dietitian can provide personalized guidance tailored to your individual needs.

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