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The Effect of Coffee on Metabolic Rate


Coffee is widely known to be a stimulant. This is due to the presence of caffeine in the drink, reviewed by (Acheson et al., 1980). The properties of caffeine as a metabolic stimulant were originally discovered in the early twentieth century, in terms of changes in the rate of respiration of individuals that ingest caffeine through drinking coffee. (Higgins and Means, 1915). One cup of coffee contains about 100mg caffeine and is approximately equivalent to the ingestion of caffeine at 1.25mg/kg of body weight (Acheson et al., 1980).  

Both subjects were observed to exhibit movements of their bodies that may have resulted in non-exercise activity thermogenesis in this study and therefore such activity is likely to have affected the outcome of the study in terms of the total energy expenditure observed here. This observation provides a further caveat to the conclusions provided by the data calculated from this study.

Overall, this study has provided the expected outcome that caffeine increases the energy expenditure of an individual while not affecting their gas exchange or respiratory quotient, but because of the number of potential variables in the study, a further, more rigorous investigation is required to confirm that the data presented here are viable and accurate.

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