Variability in caffeine consumption from coffee and tea: Possible significance for epidemiological studies

Stavrić, B.; Klassen, R.; Watkinson, Barbara; Karpinski, K.; Stapley, R.; Fried, Peter A.

doi:10.1016/0278-6915(88)90107-x

Cited by 80 publications

(40 citation statements)

References 23 publications

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“…However, since Barone & Roberts (1984) based their estimates on servings of 150 ml, their figures require adjustment. A cup-size of 225 ml appears to be more representative of typical servings of caffeinated beverages (Stavric et al, 1988). Accordingly, total daily consumption in the present study was based on the following estimates: 125 mg per cup for brewed coffee, 90 mg per cup for instant coffee, 4.5 mg per cup for decaffeinated coffee, 60 mg per cup for tea, 20 mg per glass and 40 mg per can for cola drinks, and 5 mg per cup for chocolate drinks (e.g., cocoa, hot chocolate).…”

Section: Sources Of Dietary Caffeinementioning

confidence: 99%

Self‐report reliability and symptomatology of habitual caffeine consumption.

James

Bruce

Lader

et al. 1989

Brit J Clinical Pharma

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1 A large body of research on the demography of caffeine use and its potential health consequences has been undermined by the absence of empirical data on the reliability of retrospective self-reports of caffeine consumption. 2 The principal aim of the present study was to use standard bioanalytic methods to assess the reliability of subjects' self-reported caffeine use. Saliva samples were obtained from 142 first-and second-year medical students and assayed for caffeine and paraxanthine. 3 Self-reported caffeine use was found to be significantly correlated with salivary caffeine (r = 0.31, P < 0.001) and paraxanthine (r = 0.42, P < 0.001), thereby providing qualified support for the use of questionnaires to estimate patterns of caffeine consumption. 4 A secondary aim of the study was to extend previous research concerning the symptomatology of caffeine use by examining the association between caffeine exposure and a variety of measures of somatic and psychological health. Caffeine consumption was reliably associated with the self-reported occurrence of somatic symptoms, but not psychological well-being.

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Section: Sources Of Dietary Caffeinementioning

confidence: 99%

Self‐report reliability and symptomatology of habitual caffeine consumption.

James

Bruce

Lader

et al. 1989

Brit J Clinical Pharma

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“…Dietary intake of caffeine in Hungary seems to be signifi cantly lower than the data reported by other countries, including the US, Canada, Ireland, Denmark, Iceland, and so on (STAVRIC et al, 1988;BARONE & ROBERTS, 1996;NCM, 2002;NAWROT et al, 2003;OFFICE OF FOOD ICELAND, 2004;FRARY et al, 2005). Assuming that one cup of coffee contains about 80 mg of caffeine, the average Hungarian consumer consumes around two cups of coffee per day.…”

Section: Discussionmentioning

confidence: 88%

Caffeine intake in Hungary – A population based estimation

2015

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Caffeine is a bitter, white crystalline xanthine alkaloid that is synthesized in different parts of more than 60 plant species. In a previous study, caffeine content of 377 food samples obtained from the Hungarian market was measured by a validated HPLC technique. These analytical data were built up into a food composition database called NutriComp. Dietary caffeine intake of the Hungarian population was estimated based on the data of the National Nutritional Status Survey 2009. Daily caffeine intake of Hungarian adult males and females were 147±6.2 mg per capita (95% CI: 135-160), and 138±4.2 mg per capita (95% CI: 129-147), respectively. There was no signifi cant difference between genders. The oldest men and women consumed signifi cantly less caffeine than the people between 35-64 years of age. The main sources of caffeine are coffee and tea with 58-59%, and 35-37% of the total intake in men and women, respectively.

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“…This dose of caffeine corresponds to approximately 60-80 mg/kg daily for each rat. This dose is also equivalent to 10-20 mg/kg daily that corresponds to 3-4 cups of coffee consumption in humans (26). Although the amount of caffeine used in rats in this study seems to be high when compared with the dose consumed by people, given that the half-life of caffeine in rats is 1 h, when compared with 5 h in humans, a higher dose is needed in rats to get the same plasma and brain concentration (27).…”

Section: Discussionmentioning

confidence: 99%

The effect of caffeine on neuron number of rats exposed to 900-MHz electromagnetic field

2018

Turk J Vet Anim Sci

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IntroductionRecently, an increasing number of studies have investigated whether an electromagnetic field (EMF) has harmful effects on human health. The number of masses influenced by the radiofrequency waves radiated by base stations and cell phones increases as time goes by. In particular cell phones, which provide useful services to humans, are thought to have many harmful effects (1). The effects of EMF on the tissues and organs of human beings are frequently investigated (2). The most outstanding of these are studies that present the effects of EMF on central nervous system diseases and brain functions.Radio waves that occupy the frequency range from 3 kHz to 300 GHz are forms of electromagnetic energy. The devices working in this frequency range form an impact area called radiofrequency EMF. Cell phones operate in the frequency range of 800-2600 MHz. The third-and fourthgeneration mobile phones use microwaves of 1800-2100 MHz whereas second-generation phones operate at 900 MHz, which is still the most commonly used mobile communication system (3).Since developing tissues and organs are very sensitive to harmful agents, the potential harmful effects of microwaves on children have been assessed in the agenda of the World Health Organization since 2006, and continuous studies are being conducted on the subject (4). A wide-scale casecontrol study conducted by two different research centers has examined the relationship between brain tumors and cell phone use. One of these studies found a significant association between cell phone use and malignant brain tumors (4). On the other hand, another study reported that cell phone use of 10 years did not increase the risk for acoustic neuroma, and it was also mentioned that 10year cell phone use was not long enough for neuroma development. (5). Exposure to 900-MHz EMF was shown to decrease the number of Purkinje cells in the cerebellum (3).Caffeine (1,3,7-trimethylxanthine), is a psychostimulant consumed in great amounts in Western countries (6). This purine alkaloid, which has a formula of C 8 H 10 N 4 O 2 , is found in coffee, tea, energy drinks, various soft drinks, and cacao. In addition, it is naturally found in the fruits, seeds, and leaves of many plants (7).Although it changes from person to person, people generally consume some caffeine every day without even realizing it. A brewed coffee drink of 437 mL contains an average of 188 mg of caffeine. The caffeine concentration in coffee beans can differ between 0.01 mg/g and 19.9 mg/g.

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Variability in caffeine consumption from coffee and tea: Possible significance for epidemiological studies

Cited by 80 publications

References 23 publications

Self‐report reliability and symptomatology of habitual caffeine consumption.

Self‐report reliability and symptomatology of habitual caffeine consumption.

Caffeine intake in Hungary – A population based estimation

The effect of caffeine on neuron number of rats exposed to 900-MHz electromagnetic field

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