Purple sweet potato porridge is not only simple to make and nutritious, but also soft, glutinous, and sweet, making it a very popular porridge. However, observant people will notice that while the purple sweet potato itself is purple, the porridge it makes turns blue. This phenomenon confuses many people and makes them hesitant to eat it. The reason purple sweet potato porridge turns blue is that purple sweet potatoes are rich in anthocyanins. Anthocyanins turn reddish-purple in an acidic environment and blue in an basic environment.
Rice porridge is a relatively basic environment. When purple sweet potatoes are added, it turns blue, which is a normal phenomenon and can be eaten with confidence. If you don't like this color, you can simply add a few drops of white vinegar or lemon juice when the porridge is done, stir it, and the porridge will turn back to purple.
Anthocyanins are widely found in foods such as blueberries, strawberries, mulberries, grapes, purple sweet potatoes, purple cabbage, black rice, and more. Appropriately consuming more of these foods in your daily diet can help eliminate free radicals in the body, enhance immune function, prevent cardiovascular and cerebrovascular diseases, and is very beneficial to your health.