Drinking coffee on a regular basis generally provides the body with nutrients such as potassium, and if consumed in excess may also cause conditions such as insomnia. 100g of coffee contains protein (12.2g), ash (8.8g), water (3.1g), carbohydrates (68.4g), niacin (28.17mg), and potassium, magnesium (327mg), selenium (12.60μg) and other minerals, the general appropriate consumption will not have an impact on the health of the body, but also for the body to supplement the nutrition. However, coffee also contains caffeine, if a large amount of drinking, it may excite the central nervous system, and in serious cases, it may also cause insomnia and other situations. For pregnant and breastfeeding women should try to avoid drinking coffee, so as not to affect the growth and development of the fetus and the baby. It is recommended to drink coffee in moderation and avoid overdrinking to avoid adverse effects on the body.