Thứ Sáu, 20 tháng 11, 2009
How Is Coffee Linked to Weight Gain?
Thứ Bảy, 20 tháng 10, 2007
Do You Depend On Coffee To Boost Your Energy?
Recently, I learnt from newspapers that a 17-year-old English girl was rush to hospital with palpitations and breathing difficulties after she drank 7 double espressos within a few hours.
This rare incident occurred in August 2007. The young girl was helping at her family's sandwich shop. She chose to drink espressos to help her stay aware during her shift.
Isn't this horrifying? How can this happen?
According to doctor's diagnosis, the excessive caffeine contained in the coffee did help energise her initially, but it ended up making her heart beat faster than normal and gave her a fever: the high amount of caffeine had actually sent her body into a mild state of shock.
Like many of you, I am a coffee lover, too. If I don't have a cup of coffee for whatever reason on any single day, I will just have a feeling that something is missing in that day. But I am not addicted to coffee, and I normally limit my consumption to only 1 - 2 cups, occasionally more but definitely not exceeding 4 cups.
Why is that so?
I don't drink coffee to boost my energy, as the English girl and many other people do. In general, the caffeine intake should not exceed 450mg a day, which is equivalent to 4 cups of coffee. This is advice given by most doctors.
Of course, this also depends on the type of beverage one consumes. For instance, one shot of double espresso contains about 150mg of caffeine. So, one should drink not more than 3 cups of espressos per day.
Gender, age, weight, height or smoking habits also plays a part in determining one's sensitivity to caffeine. For example, some people can drink several cups of coffee within an hour without any side effect while others can take not more than 1 cup of coffee per day.
When people want to keep themselves aware, they will usually turn to coffee. Why?
Caffeine can actually stimulate our body's nervous and cardiovascular systems, leading to increased attentiveness, decreased fatigue and an elevated mood. But if one over-depends on coffee regularly and heavily to boost energy, it is likely to create a dependence that leads to increased tolerance to its effects. These people will feel drowsiness, anxiety, headaches, fatigue and irritability if they do not have one cup of coffee for any single day.
Moreover, caffeine also increases the production of stomach acids that will bring on psychiatric disturbances like sleep disorders and anxiety.
People cannot sleep well during the night will in turn affect their daytime functioning. Symptoms such as mood swings, lack of concentration and poor performance at work will surface.
Instead of depending on coffee, having a good night's rest and adequate physical activity at least 30 minutes and three times a week have been shown to help keep energy levels up.
I have also compiled an article about the relationship between coffee and heart disease. If interested, just click the below title:
Thứ Ba, 26 tháng 12, 2006
Hypertension And Caffeine
While it is still not clear how caffeine can contribute to hypertension, a 4-week study had suggested that people who are at risk of developing hypertension may want to reconsider before taking another cup of coffee.
During the study, healthy adult volunteers, who had their blood pressures measured to monitor their responses to caffeine intake, had minor change in blood pressure as a result of their morning coffee. However, a greater effect on blood pressure was found for people who had a family history of hypertension or with borderline blood pressure.
The research, therefore, concluded that people with or at risk of developing hypertension should not consume more than 4 cups of coffee a day.
Thứ Tư, 6 tháng 12, 2006
Is Coffee A Healthy Drink?
Most people will regard coffee as a bad beverage because of the caffeine it contains. As a matter of fact, British Dietetic Association has advised people not to drink too much coffee because this can make us feel jittery or unable to fall asleep. Pregnant women should take no more than 2 cups per day.
On the other hand, recent studies have suggested otherwise: a moderate consumption of coffee may in fact good for us. A Harvard School of Public Health study had found that men who drank more than 6 cups of coffee a day could reduce their risk for Type 2 diabetes by 50 percent and women by nearly 30 percent. As we all know, diabetes is a risk factor for heart disease. If its risk can be reduced, then the possibility of developing heart disease might be much lower too.