Discussing Effects-1-Effects of too much caffeine -revised

  Do you drink coffee or tea to stay awake?  Both of them contain coffeine which can sober people up.  According to  the report, drinking a moderate amount of caffeine can help you concentrate your attention on what you are doing in short time.  Nevertheless, drinking too much caffeine may cause bad influence on your health.  Doctors point out that heavy caffeine use is more than 500 to 600 mg a day (four to seven cups of coffee).  There are serious effects of too much caffeine below:  Firstly, don't drink too much coffee or tea before you go to bed; otherwise, you may suffer from an insomnia which keeps you wakeful till next morning.  On account of bad sleeping quality for a long period, you will get nervous and anxious easily when you are going to do something important such as giving a speech, having a meeting or test.  Worst of all, you may get  headaches on and off.  Futhermore,  don't drink too much coffee or tea when you are on an empty stomach, it may do harm to your stomach and even result in nausea or other gastrointestinal problems.  Besides, drinking too much coffee may lead to not only muscle tremors that will keep you from holding something steady, but fast or irregular heartbeat that will make you be short of breath. Though the effects of drinking coffee or tea are not always negative, you need to control yourself when you are going to buy cups of them. Thus, only you pay attention to the amount of caffeine can you enjoy the benefits which it brings to you.  Due to all the above-mentioned effects, it is obvious that drinking too mush caffeine isn't good for health.