The results showed that when cooking with tap water, the loss of vitamin B 1 was directly proportional to the cooking time and temperature, generally 30%  If you cook with boiled water or distilled water, it will not cause the loss of vitamin B 1  The number of rice washing is directly proportional to the loss of vitamin B 1  However, the loss of vitamin B
We should use boiling water to wash rice and cook.
1 is 40% whether you use boiled water, tap water or distilled water to wash rice