High blood pressureCaffeine in coffee can cause an increase in blood pressure for some sensitive individuals.Renal failure patients with high potassium levels need to follow a low-potassium diet, and coffee has a high potassium content.Coffee contains caffeine that stimulates gastric acid secretion and relaxes smooth muscles of the digestive system, accelerating food metabolism and reducing its nutritional value.Caffeine can reduce insulin secretion in the pancreas, decreasing glucose tolerance and increasing insulin excretion, thereby raising blood sugar levels.

Epilepsy Caffeine excites the central nervous system and xanthine causes vasconstriction, reducing cerebral blood flow, which is very detrimental to epilepsy patients.

Coffee increases fat and triglyceride content, adding to the burden on the heart and oxygen consumption.

Especially when the body is tired or smoking excessively.Iron deficiency anemia Coffee accelerates food metabolism, lowering iron absorption rates.To prevent recurrence of calcium oxalate kidney stones, one must avoid foods rich in oxalic acid, such as coffee.

Long-term consumption of coffee can affect its sedative effects, increasing the number of wakeful periods and reducing sleep depth.Besides those with specific health conditions who should not drink coffee, healthy individuals may also have adverse reactions or pathological phenomena from drinking it, including pregnant women, breastfeeding mothers, and athletes.

Coffee for heart disease can increase fat and triglyceride levels, increasing the burden on the heart and oxygen consumption.Especially when the body is tired or smoking excessively.

Caffeine can accelerate food metabolism and reduce iron absorption in cases of iron deficiency anemia.

To prevent recurrent calcium oxalate kidney stones, one must avoid foods rich in oxalates, such as coffee.

Long-term consumption of coffee can affect its sedative effects, increasing wakefulness episodes and making sleep less deep.Apart from patients who should not drink coffee due to these conditions, healthy individuals may also experience adverse reactions or pathological phenomena when consuming it, including pregnant women, lactating mothers, and athletes.