Proper amount of caffeine is good for the health, however some people should not have coffee including heart diseases, gastrointestinal diseases, kidney disease that should limit potassium intake.
So can they drink coffee? The answer is no.
A study published in January 2010 in the “British Journal of Nutrition” found that habitual coffee consumption of one or more cups of coffee per day was associated with increased levels of GFR.
What is more, coffee is not good for controlling blood sugar level. Coffee can lower the secretion of insulin, increase insulin excretion and reduce glucose tolerance and increase blood sugar level.
It will cause more greater harms to the body if you drink coffee together with alcohol. Alcohol can affect the functions of stomach, intestine, heart, liver and brain and cause metabolic disorder. The brain will be in a highly inhibitory state. While coffee will on the other hand activate the brain. The opposite effects of coffee and alcohol will disturb the functions of the brain.
In a word, it is better that kidney failure patients should not drink coffee. And for healthy people, too much coffee is not good, neither. Excessive intake of coffee can cause rapid increase of cortisol and adrenalin and disturb our sleep.
