If you have always liked sour food in your life, it is likely that your personal taste is the reason and there is no big problem. However, if you are not particularly fond of sour food and suddenly have a change in eating habits, you need to consider whether you are pregnant. The reason is that after pregnancy, with the changes in hormone levels and changes in body metabolism, women may experience more significant changes in their eating habits. If you have had sex before and your period has been significantly delayed, you can use an early pregnancy test to test the middle part of your morning urine to see if there is a possibility of pregnancy; or if you have had intercourse for more than a week, you can test your blood to see if you are pregnant and determine if the change in your eating habits is caused by pregnancy.