Tomatoes: Contain large amounts of pectin, persimmon tannin, soluble astringents, and other components. These can easily undergo chemical reactions with stomach acid, coagulating into insoluble, hard lumps. These masses can block the pylorus, the exit of the stomach, increase gastric pressure, and cause gastric distension, leading to a feeling of bloating and pain.
Persimmons: Contain substances such as persimmon tannin, pectin, tannic acid, and phlobaphene, which have a strong astringent effect. When consumed on an empty stomach and encountering strong gastric acid, they can easily combine with the acid to form hard, difficult-to-dissolve masses. Small masses may be excreted with feces, but if large masses form, they can easily cause "Diospyrobezoars," known in Traditional Chinese Medicine as "Persimmon Stone Disease."
Bananas: Contain a large amount of magnesium. Eating a large quantity of bananas on an empty stomach can cause a sudden increase in magnesium levels in the blood, disrupting the balance of magnesium to calcium in the body. This can have an inhibitory effect on the cardiovascular system, which is detrimental to health.
Oranges: Oranges contain a high amount of sugar and organic acids. Eating them on an empty stomach can irritate the gastric mucosa.
Hawthorn: The sour taste of hawthorn has the effect of promoting qi and aiding digestion. However, consuming it on an empty stomach not only depletes qi but also increases hunger and can aggravate stomach ailments.
Sugarcane and Fresh Lychee: Do not consume excessive amounts of sugarcane or fresh lychee on an empty stomach, as this can lead to a sudden influx of excessive high-sugar content in the body, causing "hyperosmolar coma."