The menstrual phase is a delicate dance between traditional Chinese medicine's "yin-yang equilibrium" and modern medicine's "autonomic nervous system regulation." From TCM's perspective, excessive heat accumulation (上火) during menstruation disrupts the heart-kidney axis, manifesting as palpitations, night sweats, or emotional volatility. Modern physiology reveals this corresponds to heightened sympathetic nervous activity, causing vasoconstriction and reduced uterine perfusion. When selecting fruits, those with warming properties like lychee or durian may exacerbate heart fire, while cooling options such as pear or watermelon help soothe inflammation by modulating prostaglandin synthesis.

The interplay between endocrine balance and fruit selection becomes evident through clinical observations. Women experiencing irregular cycles often show elevated oxidative stress markers during menstruation, which fruits rich in anthocyanins (blueberries, blackberries) can counteract through their free radical scavenging properties. Conversely, citrus fruits' high vitamin C content supports progesterone synthesis but may trigger acid reflux in those with weakened spleen-stomach qi (digestive function). The key lies in synchronizing fruit intake with circadian rhythms—consuming potassium-rich bananas in the morning aids muscle relaxation, while magnesium-dense avocados before bedtime stabilize neural excitability. This dual approach harmonizes the hypothalamic-pituitary-ovarian axis while maintaining electrolyte balance critical for preventing menstrual cramps.