A stimulant that affects kids and adults similarly, caffeine is a drug that's naturally produced in the leaves and seeds of many plants. Caffeine is also made artificially and added to certain foods. Caffeine is defined as a drug because it stimulates the central nervous system.
At lower levels, it can make people feel more alert and energetic.
The study found that coffee drinkers at midlife had lower risk for dementia (The term "dementia" is used to describe the gradual deterioration of "intellectual" abilities and behavior that eventually interferes with customary daily living activities.)and AD later in life compared to those drinking no or only little coffee. The lowest risk (65 percent decreased) was found among moderate coffee drinkers (drinking 3-5 cups of coffee daily).
"We aimed to study the association between coffee and tea consumption at midlife and dementia / AD risk in late-life, because the long-term impact of caffeine on the central nervous system was still unknown," said lead researcher, associate professor Miia Kivipelto, from Karolinska Institutet. [The study was published in the January 2009 issue of the Journal of Alzheimer's Disease.]Here's how some sources of caffeine compare:
| Item ================= | Amount of Item ============= | Amount of Caffeine ============== |
| Jolt soft drink | 12 ounces | 71.2 mg |
| Mountain Dew | 12 ounces | 55.0 mg |
| Coca-Cola | 12 ounces | 34.0 mg |
| Diet Coke | 12 ounces | 45.0 mg |
| Pepsi | 12 ounces | 38.0 mg |
| 7-Up | 12 ounces | 0 mg |
| brewed coffee (drip method) | 5 ounces | 115 mg* |
| iced tea | 12 ounces | 70 mg* |
| dark chocolate | 1 ounce | 20 mg* |
| milk chocolate | 1 ounce | 6 mg* |
| cocoa beverage | 5 ounces | 4 mg* |
| chocolate milk beverage | 8 ounces | 5 mg* |
| cold relief medication | 1 tablet | 30 mg* |
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