Like so many foods and nutrients, too much coffee can cause problems, especially in the digestive tract. But studies have shown that drinking up to four 8-ounce cups of coffee per day is safe. Sticking to those boundaries shouldn't be hard for coffee drinkers in the U.S., since most drink just a cup of java per day.
So, is coffee harmful for health?
Studies have shown that coffee may have health benefits, including protecting against Parkinson's disease, type 2 diabetes and liver disease, including liver cancer. Coffee also appears to improve cognitive function and decrease the risk of depression. However, the research appears to bear out some risks.
Is it bad to have coffee every day?
But if you use a filter, or drink instant coffee – or if you only drink French press coffee or Turkish coffee every once in a while – you're OK, he says. “But if you drink it every day in huge amounts, it may have an effect on your cholesterol levels.” The caffeine in coffee may be harmful during pregnancy.
What are the negative effects of caffeine?
The Mayo Clinic state that consuming more than 500-600 mg of caffeine a day may lead to insomnia, nervousness, restlessness, irritability, an upset stomach, a fast heartbeat and even muscle tremors. However, previous research has linked even moderate amounts of caffeine to negative health effects.