Acidic and Alkaline Foods: A Guide for Your Family's Health - Nutrition

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Dr.
Tsai: My family member just returned from the hospital, and the doctor advised avoiding "acidic" foods.
Could you please tell me which foods are acidic and which are alkaline? If possible, could you also indicate strong acids, moderate acids, weak acids, strong bases, moderate bases, and weak bases? Thank you.

Pinggu, 20~29 year old female. Ask Date: 2010/05/17

Dr. Cai Xiuwen reply Nutrition


Hello! I'm not sure about the reason for your family member's hospitalization, but the acidity and alkalinity of food can be divided into the intrinsic acidity of the food itself and the impact it has on the blood pH after digestion and absorption in the body, which can influence certain diseases.

For gastrointestinal issues, in addition to the acidity of food, it is important to consider foods that stimulate gastric acid production and those that may delay gastric emptying.
When it comes to the effect of food on blood pH after digestion, it is essential to note that foods high in sodium, potassium, calcium, and magnesium produce alkaline oxides in the body, which are referred to as alkaline foods.
Conversely, foods rich in phosphorus, sulfur, and chlorine generate acidic residues upon oxidation in the body, known as acidic foods.
Regarding whether a food is a strong acid or weak acid, it is important to consider the mineral content and the quantity consumed, as both can influence this.
For example, spinach, radishes, watermelon, and soybeans are higher in alkaline ash components, while egg yolks, oysters, chicken, and white rice contain more acidic ash components.
However, the body has mechanisms to maintain pH balance, so consuming a lot of these foods will not significantly affect blood pH levels.

It is still recommended to consume plenty of fruits and vegetables, aiming for over 300 grams of vegetables and two servings of fruit daily, along with an appropriate intake of protein sources like eggs and meat, approximately 4-5 ounces per day.
Wishing you good health.
This information is provided by Dietitian Tsai Hsiu-Wen from Nantou Hospital, Department of Health.

Reply Date: 2010/05/17

More Info


Understanding the distinction between acidic and alkaline foods is essential for maintaining a balanced diet and promoting overall health. The body's ideal pH level is slightly alkaline, around 7.4, and the foods we consume can influence this balance.
Acidic Foods:
Acidic foods are those that, when metabolized, produce an acidic environment in the body. They can be categorized into strong, moderate, and weak acidity based on their potential to lower the body's pH.

1. Strong Acidic Foods:
- Processed meats (e.g., bacon, sausage)
- Sugary drinks (sodas, energy drinks)
- Refined grains (white bread, pastries)
- Fast food items
2. Moderate Acidic Foods:
- Dairy products (cheese, yogurt)
- Eggs
- Fish and shellfish
- Grains (especially wheat)
3. Weak Acidic Foods:
- Most fruits (e.g., cranberries, prunes)
- Certain vegetables (e.g., corn, olives)
Alkaline Foods:
Alkaline foods, on the other hand, help to neutralize acidity in the body and can be classified similarly into strong, moderate, and weak alkalinity.

1. Strong Alkaline Foods:
- Leafy greens (spinach, kale)
- Cruciferous vegetables (broccoli, cauliflower)
- Sea vegetables (spirulina, kelp)
- Fresh herbs (parsley, cilantro)
2. Moderate Alkaline Foods:
- Nuts and seeds (almonds, flaxseeds)
- Legumes (lentils, chickpeas)
- Fruits (bananas, avocados)
- Root vegetables (sweet potatoes, carrots)
3. Weak Alkaline Foods:
- Most other vegetables (e.g., bell peppers, zucchini)
- Some fruits (e.g., apples, pears)
Health Implications:
A diet high in acidic foods can lead to various health issues, including inflammation, weakened bones, and increased risk of chronic diseases. Conversely, a diet rich in alkaline foods can promote better health by reducing inflammation, improving digestion, and enhancing overall well-being.

Practical Tips:
1. Balance Your Plate: Aim for a diet that includes a variety of foods from both categories, but focus more on alkaline foods. A good rule of thumb is to fill half your plate with vegetables and fruits.


2. Stay Hydrated: Drinking plenty of water can help maintain your body's pH balance. Consider adding lemon to your water; while it is acidic in nature, it has an alkalizing effect once metabolized.

3. Limit Processed Foods: Processed and refined foods tend to be more acidic. Try to minimize their intake and replace them with whole, natural foods.

4. Listen to Your Body: Everyone's body reacts differently to foods. Pay attention to how you feel after eating certain foods and adjust your diet accordingly.

In conclusion, understanding the balance of acidic and alkaline foods can help you make informed dietary choices that promote health and well-being for you and your family. If you have specific health concerns or dietary restrictions, consulting with a healthcare professional or a registered dietitian can provide personalized guidance.

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