The Caffeine CatchCaffeine, a chemical typically found in coffee, has caused a lot of concern because it isone of the few drugs that show up regularly in our food supply.You probably 56 (use)caffeine since childhood. Caffeine57(be) in your first Coke. If you ever enjoyed achocolate bar, you ate caffeine. Soft drinks are the major source (来源)of caffeine for mostchildren and even some adults.58(recent), caffeine has found its way into orange,apple, and other flavored drinks.Small amounts of caffeine-a cup59 two of coffee a day—seem safe for mostpeople. However, some people have trouble with even small amounts. One cup of coffee60the late afternoon or evening will cause 61(they)to stay awake almost allnight. Larger amounts of caffeine can cause a problem 62(call)caffeinism. You getvery nervous and you can't sleep.It is possible63caffeine may cause birth defects(缺陷)in humans,too.One studyshowed that 64(woman)who drank a lot of coffee,like eight or more cups per day, while they were pregnant were more likely 65(have) children with birth defects.