Can I drink black coffee before exercising in the evening?

Generally, it is not recommended to drink black coffee before exercising in the evening. The detailed explanation is as follows:

Black coffee contains ingredients such as caffeine and chlorogenic acid. Caffeine stimulates the central nervous system, keeping the brain in a prolonged state of heightened alertness. Drinking black coffee before evening exercise may easily lead to insomnia, affecting work and daily life the following day. Caffeine effectively promotes urinary calcium excretion, which may disrupt the body's calcium balance. For women over 35 whose bone density begins to decline, this could further increase the risk of osteoporosis. Caffeine may also cause an increased heart rate; for individuals who already have a rapid heartbeat, consuming black coffee before evening exercise might place extra strain on the heart and even trigger adverse reactions such as shortness of breath.

If you do wish to drink black coffee before exercising to enhance performance, it is advisable to do so in the morning or afternoon, avoiding evening consumption. Even when consumed in the morning or afternoon, moderation is important to prevent adverse effects caused by excessive caffeine intake.