1. High Blood Pressure Coffee contains caffeine, which can cause blood pressure to rise in some sensitive patients.
2. Renal Failure For patients with renal failure who have hyperkalemia (high blood potassium), they need to follow a potassium-restricted diet, as coffee is high in potassium.
3. Peptic Ulcer Caffeine stimulates gastric acid secretion and relaxes the smooth muscle and blood vessels of the digestive system, accelerating the metabolism of food and reducing its nutritional value.
4. Diabetes Caffeine can reduce insulin secretion from the pancreas, decrease glucose tolerance, and increase insulin excretion, which can lead to elevated blood sugar levels.
5. Epilepsy Caffeine can stimulate the central nervous system, and xanthine can cause vasoconstriction, reducing blood flow to the brain. This is particularly detrimental to patients with epilepsy.
6. Heart Disease Coffee can increase the levels of fat and triglycerides, adding to the burden on the heart and oxygen consumption. This is especially likely to occur when the body is tired or when smoking is excessive.
7. Iron Deficiency Anemia Coffee can accelerate the metabolism of food and decrease the absorption rate of iron.
8. Kidney Stones To prevent the recurrence of calcium oxalate stones, it is necessary to avoid foods rich in oxalate, and coffee is a food that is high in oxalate.
9. Insomnia Long-term coffee consumption can affect its sedative effects, increase the number of awakenings, and lead to lighter sleep. In addition to the patients mentioned above who should not drink coffee, healthy individuals may not all be suitable for drinking coffee. For example, pregnant women, breastfeeding women, and athletes may experience adverse sensations or pathological phenomena when they consume it.