1. Vinegar is an acidic substance with a pH value of less than 7, but as a food, it is alkaline.

2. The scientific name of vinegar is acetic acid. Before it is absorbed and metabolized by the human body, it is an acidic substance. When vinegar entered the field of food nutrition from the chemical field, vinegar became an alkaline food.

3. Vinegar is a traditional condiment in all major Chinese cuisines. According to existing written records, working people in ancient China used wine as a starter to ferment and brew vinegar. Oriental vinegar originated in China. According to documented records, the history of vinegar brewing is at least more than three thousand years.