There are many nutrients in rice and vegetables, such as vitamin b 1 (also called thiamine), vitamin b2 (also called riboflavin) and vitamin C (also called ascorbic acid), which are very important in the body. One of the biggest characteristics of these vitamins is that they like acid and fear alkali, and they will be destroyed when they touch alkali.
Specifically, the vitamin b 1 in rice is more than that in polished rice, and there is almost 1.75 mg in 1 kg machine-made rice, which is enough for one person to need for one day. If you put alkali when cooking porridge with machine rice, more than half of vitamin b 1 will be lost in vain.
Of course, there are exceptions, such as putting some alkali when cooking corn porridge, which is not only harmless, but beneficial. Because corn contains nicotinic acid, it exists in a combined form and cannot be absorbed and utilized by the human body. Only under the action of alkali, the bound state releases a large amount of free nicotinic acid, which can be absorbed and utilized by the body.