There are side effects of caffeine though. Those are insomnia, nervousness, increased tension and anxiety-panic attacks, just from drinking the amount of 300 mg. The amount that causes these side effects vary from individual to individual, however, children seem to have a lower tolerance of it because of their lower body weight. The Food and Drug Administration advises pregnant women to avoid it altogether. The FDA does list it as a "safe food additive", even though pregnant women should avoid it. For those that take it regularly every day, going without it a day can cause withdrawal symptoms such as, headaches, irritability, a lack of energy and of course, sleepiness. These withdrawal symptoms are short lived though.
The following is a chart and the amount of caffeine in products you use and consume daily.
6 ounce cup of coffee - 64mg to 150mg
5 ounce cup of tea- 40mg
12 ounce can of cola- 40mg
hot coccoa - 1 cup 4mg
6 ounce chocolate bar 25mg
2 Excedrin tablets 130mg
Besides weight loss products and stay awake products and energy drinks, caffeine is being tested for pesticide use and it has been laced in women's panty hose for it's constrictive effects that are supposed to shrink thighs. Love it or hate it, caffeine is and always has been a big part of American culture and probably is here to stay.