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Athletes of all persuasions have participated in tons of tests to evaluate caffeine as an enhancer of performance and endurance, and the results, say researchers at Canada's University of Guelph, are "clear as a bell: caffeine works."
The tests show that ingesting 330 mg (or 5 mg per kilogram of body weight) 30 minutes to an hour before workouts results in longer endurance, faster times, less exertion, less fatigue, and more rapid recovery -- up to 30 percent better in each category. The most effective caffeine, though, is in tablet form, not in coffee, because the 100-plus other compounds in coffee probably block some of the effect of caffeine.
Megadoses, however, are not the right answer. Persons who do not drink caffeine steadily get the best workout-enhancer effect. In fact many groups, including the International Olympic Committee, forbid "very high doses," which they define as 600+ mg. per day (about 5 cups of drip-brewed "regular"). The other caf caveat: Don't consume while working out. As a potent diuretic, caffeine dehydrates; what exercisers take for fatigue could be serious dehydration.
The Fat BurnerNone of the research reports flat-out recommends caffeine as a weight-loss/control catalyst, but the implications are pretty clear.
Categorical caffeine content varies widely, as much as 50 percent plus or minus. The following are "approximate averages" in milligrams.
| COFFEE, PER 5-OZ. CUP: |
Espresso | 200 |
| Boiled (Cowboy/Camp/Norwegian) | 200 |
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| Brewed, drip | 115 |
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| Brewed, perked | 80 |
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| 50-50 or Lite, drip | 55 |
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| 50-50 or Lite, perked | 40 |
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| Instant | 65 |
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| Decaf, brewed | 3 |
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| Decaf, instant | 2 |
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| TEAS, PER 5-OZ CUP |
Brewed, U.S. brands | 40 |
| Brewed, imports | 60 |
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| Instant | 30 |
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| Iced (12 oz.) | 70 |
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| CAF WATER |
Water Joe, 16.9 oz. |
65 |
| CAF SOFT DRINKS, 6 OZ. | 18 |
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| COCOA, 5 OZ. | 4 |
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While all reports conclude that caffeine causes no significant loss of calcium in adults, it's an entirely different case for children. It's widely thought that coffee will, as kids say, "stump your growth." It does worse than stunt; it destroys: caffeine actually dissolves the calcium in young bones.
When a test group of 13-to-18-year-olds drank an unsweetened caffeinated drink, their urinary calcium output increased by 25 percent (to 20 mg per hour for three hours). When they drank caffeine-plus-sugar, their calcium loss was 30 mg/hour. Phosphorus, found in most colas, accelerates bone loss even more; one cola costs as much as 120 milligrams of calcium. Furthermore, a soft drink after a workout also depletes children's sodium, chloride, and potassium, causing sore muscles and delayed recovery time after exercise.
Related Links:
Super Foods: The Top 10 Healthiest Foods
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