The acidity and alkalinity of the human body are not actually determined by eating, but rather by the inherent acidity and alkalinity levels in our bodies. Normally, the human body is weakly alkaline, which is quite normal. If an acidic constitution is detected, it is detrimental to the body.

When an alkaline constitution occurs, the human body may experience the following adverse symptoms:
1. When the body is alkaline, it is prone to obesity, fatigue, tiredness, and low spirits.
2. Acidic constitution can easily cause ulcers, constipation, etc. When the acidity in the body increases and causes qualitative changes, diseases also occur.
3. Acidic constitution is very harmful to the stomach. Excessive stomach acid can cause stomach pain, acid reflux, and even develop into gastric ulcers.
4. Causing joint pain. The acidity in body fluids is high, producing an acidic substance that swims through the body and forms a crystal in the joints, which directly leads to gouty joint diseases.
5. Affects the development of intelligence. Acidic constitution can affect intelligence, and there has been a survey report stating that intelligence is closely related to the acidity and alkalinity of the cerebral cortex. The stronger the alkalinity of the cerebral cortex, the higher the IQ, and vice versa, the lower the IQ.
However, if the body's constitution is in a strong alkaline state, it is also easy to cause alkalosis. When the pH value exceeds 7.4, it belongs to a strong alkaline constitution. People with a strong alkaline constitution have a fast turnover rate of skin cells, vigorous secretion of glands, and a large amount of sweat secretion, which reduces the acidity of sebaceous glands and decreases the skin's ability to resist diseases. Bacteria are prone to invade and easily infect skin diseases.
Therefore, for the sake of physical health, it is recommended to keep the body in a weakly alkaline state. Some people have heard that women's acidic constitution can increase the probability of having a daughter, but this claim has not been scientifically verified so far. Therefore, it is recommended not to believe these legends to avoid physical harm.