• Coffee is a central nervous system stimulator that gives the adrenals a kick and causes production of the stress handling hormone adrenalin and the production of more cortisol resulting in short term benefits of heightened awareness / alertness and more energy, but long term may result in a crash after each consumption to lower levels of energy than previously thereby necessitating another cup and another cup, etc. Thus, it may be addictive and ultimately may result in adrenal exhaustion.
• Even though coffee has never been conclusively linked to cancer, it does contain acknowledged carcinogens such as caffeine and other chemicals produced by the high heat of roasting such as creosote, pymdine, tars, and polycyclic aromatic hydrocarbons.
• Caffeine interferes with adenosine, a brain chemical that normally has a calming effect.
• Cortisol levels are raised which in turn results in constriction of the blood vessels, harder pumping of the heart and higher blood pressure. (Constriction of blood vessels is also a benefit, see the next section.)
• The liver in fetuses and newborns cannot metabolize caffeine, so it remains in the body for up to four days stimulating the nervous system resulting in irritability and sleeplessness.
• Coffee has been associated with low birth weight, birth defects, miscarriages, premature birth, inability to conceive, and sluggish sperm.
• Many of the chemicals in coffee and decaf irritate the stomach lining causing an increase of stomach acid leading to digestive disorders.
• Coffee, including decaf, has high amounts of vitamin K, which affects coagulability of the blood – bad for people at risk of heart attack, stroke and blood clots.
• Decreases quality of sleep.
• Caffeine may cause problems with blood sugar control after meals for type 2 diabetics.
• Coffee excites more rapid peristaltic movements of the intestines resulting in shorted transit times and less absorption of nutrients.
• Coffee hampers the absorption of essential minerals and vitamins such as magnesium, zinc, iron, potassium, and B’s.
• Coffee contributes to caries in the teeth.
• Coffee stimulates more frequent urination and subsequent loss of various vitamins and minerals such as B, C, calcium, iron and zinc.
• Caffeine may aggravate osteoporosis by leaching calcium from the bones.
• Caffeine may increase intraocular pressure in persons with glaucoma.
• Coffee may interfere with proper levels of homocysteine and cholesterol by inhibiting vitamins folate, B12 or B6.
• Coffee is one of most heavily pesticide sprayed crops.
• Caffeine aggravates stress in people who drink it every day.
courtesy: COFFEE: TO DRINK OR NOT TO DRINK
So why do I still drink coffee ??
I LOVE IT...!!!
The same site also mentions a lot of medical pros. Then why did i mention only the cons ?? Today is the first day in my life that I've felt an ill effect of coffee. Dehydration. My own advice: Drink loads of water when you drink coffee.
Of course my dehydration could be because of the fact that I hardly drink a glass of water a day which is bad (irrespective of the 7 or 8 cups of coffee I have).
PS: every poison is a medicine and every medicine is a poison