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Caffeine: a double-blind, placebo-controlled study of its thermogenic, metabolic, and cardiovascular effects in healthy volunteers.
"Astrup, A.; Toubro, S; Cannon, S; Hein, P; Breum, L;
Madsen, J. Am J Clin Nutr 1990 May; 51 (5); 759-67
In humans caffeine stimulates thermogenesis by unknown mechanisms
and its effect on body weight has not been studied. The
effect of placebo and 100, 200, and 400 mg oral caffeine on
energy expenditure, plasma concentrations of substrates and
hormones, blood pressure, and heart rate was investigated in a
double blind study in healthy subjects who had a moderate
habitual caffeine consumption. Caffeine increased energy
expenditure dose dependently and the thermogenic response was
positively correlated with the response in plasma caffeine (r =
0.52: P less than 0.018), plasma lactate (r=0.79; p less than
0.000001), and plasma triglyceride (r=0.53; p less than
0.02). Stepwise regression analysis with the thermogenic
response as the dependent variable excluded plasma caffeine and
yielded the following equation: thermic effect (kcal 1/3 h)
= -0.00459 x heart rate + 0.30315 x (triglyceride) + 0.53114 x
(lactate) + 15.34 (r=0.86l o=0.0001). The results suggest
that lactate and triglyceride production and increased vascular
smooth muscle tone may be responsible for the major part of the
thermogenic effect of caffeine."
Note from The Tea Man:
| Caffeine contents per 6 oz cup | mg. |
| Espresso Coffee | 60-90 |
| Drip Coffee | 60-180 |
| Black Tea (based upon species of tea bush) |
25-110 |
| Semi-black (Oolong) Tea (based upon species & % of oxidation) |
12-55 |
| Green Tea (based upon species/sub-species & % of oxidation |
6-16 |
Therefore, 1 cup of coffee = approximately 3 cups of black tea, 4 cups of semi-black tea and 5 cups of green tea
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