The effect of dietary caffeine on urinary excretion of calcium, magnesium, sodium and potassium in healthy young females

Massey, Linda K.; Wise, Kevin J.

doi:10.1016/s0271-5317(84)80132-3

Cited by 85 publications

(21 citation statements)

References 19 publications

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“…Although drinking coffee prepared and served in lead-glazed ceramic ware is common in Mexico, the association between coffee drinking and increased lead is independent of the effect of use of lead-glazed ceramic ware on PbB, as noted in the multiple regression analyses (Table 3). Caffeine intake is associated with increased calcium excretion in women (32,33), likely due to its effect on renal reabsorption (34). There are no data reported in the literature regarding the effect of caffeine on lead excretion.…”

Section: Discussionmentioning

confidence: 99%

Changes in serial blood lead levels during pregnancy.

Rothenberg

Karchmer

Schnaas

et al. 1994

Environ Health Perspect

108

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The first step in modli lead kinetics during pregnancy includes a description of sequential matenal blood lead (PbB) Cross-sectional studies of groups of women at different stages of pregnancy present conflicting results (1-3), and the design is inadequate to study serial changes of lead during pregnancy. Case studies with serial measurements of PbB in pregnant women are interesting (4-6), but these are usually of women suffering frank lead intoxication.The only detailed work prospectively studying PbB in pregnant women is that of Barltrop (7) A priori exclusion criteria for the study were: 1) younger than 15, older than 42; 2) active diabetes, German measles, hepatitis, or toxoplasmosis, as determined by laboratory test, 3) habitual use of alcohol or drugs, 4) use of prescription medications, 5) hypertension controlled with medication, 6) active psychosis. Women not excluded by these criteria were informed of the purpose of the study and the procedures involved. They read, or were read, a statement of informed consent approved by the institutional review board, and signed it.A total of 532 women passed the exclusion criteria and were enrolled in the study. Of this total, 30 never arrived at the project office for their first or following appointments. One case developed hypoglycemia and 27 developed conditions described by the above exclusion criteria during their pregnancy; 22 spontaneously aborted, and 16 were stillbirths. We will report these data elsewhere. The exclusion of these subjects left 436 participants.Some of the remaining women gave birth to babies meeting the following a priori exclusion criteria, and these 22 pregnancies were also removed from the present data set: 1) birth weight under 2000 g, 2) gestation age under 36 weeks, 3) 5-min Apgar score under 6, 4) multiple birth, and 5) major congenital anomaly. An additional 41 babies suffered from hyperbilirubinemia, high lead level [one baby was born with a cord level of 69 pg/dl (3.33 pmol/l); see Rothenberg et al. (6) for description of this case], minor congenital anomaly, severe infection, birth trauma, asphyxia, respiratory difficulty, or early infant death, and these cases were also excluded from the data set. Table 1 summarizes data on 159 patients who were excluded or who dropped out of the study and compares them to 373 patients retained in the study. Excluded patients were significantly older, had more pregnancies and abortions, and gave birth to lower birth-weight and lower

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Section: Discussionmentioning

confidence: 99%

Changes in serial blood lead levels during pregnancy.

Rothenberg

Karchmer

Schnaas

et al. 1994

Environ Health Perspect

108

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“…Few studies have controlled for the known calciuric effects of factors such as dietary Ca, protein, caffeine or P, or acid-base status (Lemann et al 1979;Heaney & Recker, 1982;Massey & Wise, 1984) or for the possible calciuric effects of non-dietary factors such as diuretics, antacids or antibiotics (Spencer & Kramer, 1986). Madden et al (1983), who observed a significant positive relationship between 24 h urinary excretion of Na and Ca in fifty-one young adults consuming their usual diet, found that 24 h urinary Ca or Na excretion were not significantly correlated with dietary Ca, protein, P or fibre intakes.…”

Section: S O D I U M -C a L C I U M W I T H R E F E R E N C E To O S mentioning

confidence: 99%

Sodium-Calcium Inter-Relationships with Specific Reference to Osteoporosis

Shortt

Flynn

1990

Nutr. Res. Rev.

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“…One of the main reasons for its attractiveness is due to its health beneficial aspect, which is however controversial. While catechins in green tea are well known for their antioxidative, anti‐inflammatory, anticancer, antibiotic, and antiviral effects (Frankel 2007), caffeine in green teas has been reported to have negative effects on the cardiac vascular system (Hosenpud and others 1995) and human behaviors (Smith 2002), and cause sleep deprivation (Hindmarch and others 2002), miscarriages (Giannelli and others 2003; Rasch 2003), hypersensitivity (Bernhisel‐Broadbent 1999), and calcium absorption that results in osteoporosis (Heaney and Recker 1982; Massey and Wise 1989; Hasling and others 1992). Ironically, this negative aspect of caffeine brought a new market in the green tea industry for those who want to avoid caffeine ingestion such as pregnant females, infants, and children (Park and others 2007a), who have a relatively slow detoxification rate of caffeines (Nawrot and others 2003).…”

Section: Introductionmentioning

confidence: 99%

Sensory Characteristics and Consumer Acceptability of Decaffeinated Green Teas

Lee¹,

Lee²,

Kim³

2009

Journal of Food Science

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Green tea has been widely consumed for its mild flavors and its health benefits, yet caffeine in green tea has been a limitation for those who want to avoid it. The limitation brought increase in need for decaffeinated products in the green tea market. Most of the conventional decaffeination techniques applied in food use organic solvents. However, supercritical carbon dioxide fluid extraction (SC-CO2) method is gaining its intension as one of the future decaffeination methods that overcomes the problems of conventional methods. The purpose of this study was to identify sensory characteristics of decaffeinated green teas applied with SC-CO2 method and to observe the relationship with consumer acceptability to elucidate the potentiality of applying SC-CO2 technique in decaffeinated green tea market. Descriptive analysis was performed on 8 samples: green teas containing 4 caffeine levels (10%, 35%, 60%, and 100%) infused at 2 infusing periods (1 or 2 min). It was found that the SC-CO2 process not only reduced caffeine but also decreased some important features of original tea flavors. Two groups were recruited for consumer acceptability test: one (GP I, N = 52), consuming all types of green teas including hot/cold canned teas; and the other (GP II, N = 40), only consuming the loose type. While GP II liked original green tea the most, GP I liked highly decaffeinated green teas. Although the SC-CO2 method had limitations of losing complex flavors of green teas, it appeared to have future potential in the decaffeinated green tea market within or without the addition of desirable flavors.

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The effect of dietary caffeine on urinary excretion of calcium, magnesium, sodium and potassium in healthy young females

Cited by 85 publications

References 19 publications

Changes in serial blood lead levels during pregnancy.

Changes in serial blood lead levels during pregnancy.

Sodium-Calcium Inter-Relationships with Specific Reference to Osteoporosis

Sensory Characteristics and Consumer Acceptability of Decaffeinated Green Teas

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