In conclusion caffeine/coffee stimulates the metabolic rate in both control and obese individuals however, this is accompanied by greater oxidation of fat in normal weight subjects. The thermic effect of the meal was significantly greater after coffee than after decaffeinated coffee and again fat oxidation was significantly greater after coffee. In the fourth trial, coffee was taken with a 3080 kJ meal. Plasma free fatty acids did not change in the obese. Coffee contains caffeine, a stimulant substance that is proven to increase the release of fats from the fat tissues and boost the resting metabolic rate. Substances like caffeine can make more fatty acids available within the muscle or the mitochondria to be used for energy but thats very different to. Summary By raising blood levels of epinephrine (adrenaline), caffeine promotes the release of fatty acids from fat. Metabolic rate increased significantly in both groups however, significant increases in fat oxidation were only observed in the control group. Caffeine can also speed up your metabolism, as discussed in the next chapter. In the second and third trials the effects of coffee providing 4 mg/kg caffeine were studied in control and obese subjects. While plasma glucose, insulin, and carbohydrate oxidation did not change significantly, plasma free fatty acid levels rose from 432 +/- 31 to 848 +/- 135 muEq/liter and were accompanied by significant increases in fat oxidation during the last hour of the test. Per serving, coffee typically contains the highest amount of caffeine of these three beverages. Metabolic rate increased significantly during the 3 hr after caffeine ingestion. Caffeine is a natural stimulant commonly found in coffee, tea, and soda. In the first trial 8 mg/kg caffeine was compared with a placebo in normal weight subjects. A series of four trials was carried out to investigate the effects of caffeine and coffee on the metabolic rate and substrate utilization in normal weight and obese individuals.
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