Why instant coffee is not suitable for excessive consumption during menstruation
Generally, the reasons why instant coffee is not suitable for excessive consumption during menstruation may include affecting the menstrual cycle, exacerbating dysmenorrhea symptoms, impairing sleep quality, causing significant mood swings, and irritating the gastrointestinal tract. A detailed analysis is as follows:

1. Affecting the Menstrual Cycle
Instant coffee contains a relatively high level of caffeine, which has a stimulating effect on the nervous system. Consuming large amounts during menstruation might increase women's nervous excitability, thereby affecting hormonal balance and potentially leading to menstrual disorders or irregularities.
2. Exacerbating Dysmenorrhea Symptoms
Caffeine may also cause uterine contractions. For women who already suffer from dysmenorrhea, drinking instant coffee during menstruation could worsen the symptoms, causing increased abdominal pain and discomfort.
3. Impairing Sleep Quality
Caffeine has an alertness-promoting effect but can also disrupt sleep quality. Women during menstruation may already feel fatigued and drowsy; consuming large amounts of instant coffee at this time might lead to insomnia or reduced sleep quality, thus exacerbating physical fatigue.
4. Significant Mood Swings
Caffeine stimulates nerve cells and accelerates blood circulation. In women, this may trigger emotions such as anxiety, irritability, and restlessness, thereby affecting mood during menstruation, leading to significant emotional fluctuations, and negatively impacting physical and mental health.
5. Irritating the Gastrointestinal Tract
Some women may experience gastrointestinal discomfort during menstruation, such as nausea, vomiting, and bloating. Excessive consumption of instant coffee at this time might further irritate the gastrointestinal tract.
Women should maintain good living and dietary habits during menstruation, such as ensuring adequate rest, avoiding excessive fatigue and strenuous exercise, and keeping warm.