Black coffee is generally not recommended when preparing for pregnancy. Black coffee, i.e. unmodified coffee, is made from coffee beans, which have a high caffeine content. Excessive intake of caffeine can easily affect the ovarian function of women, making the ratio of estrogen and progesterone in their bodies imbalanced and lowering the rate of conception. The caffeine content in black coffee can easily cause central nervous system excitation, which may affect the normal work and rest of those who are preparing for pregnancy, resulting in a decline in the quality of their sleep. In order to adjust the physical state during the preparation for pregnancy, men and women should minimize the intake of caffeine-containing foods, adjust the diet under the guidance of a physician to ensure balanced nutrition, and avoid stimulating foods such as cigarettes and alcohol. If the habit of drinking black coffee exists in daily life, it should be adjusted in time and replaced with other healthy drinks during the preparation period. During the preparation period, you need to pay more attention to your daily diet, try to maintain a reasonable work schedule and adjust your body functions in order to improve your chances of conception.