Amount of Body Fat

Lipid tissue also makes a huge difference. Skinny users not only have a faster metabolism (usually), but also lack storage for THC metabolites. Fat will cause a lag in excretion pattern, and lead to a longer detection time. 

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Differences among individuals can partially explain the differences in the before workshift and end of workshift levels of trichloroethylene and its metabolites. Increased respiration rate during a workday, induced by physical workload, has been shown to affect levels of unchanged trichloroethylene more than its metabolites, while the amount of body fat influences the levels of the solvent and its metabolites in breath, blood, and urine samples before workshift exposure (Sato 1993). Additionally, liver function affects measurements of exhaled solvent at the end of workshift increased metabolism of trichloroethylene will tend to decrease the amount exhaled after a workshift. Increased renal function would affect levels of TCA and trichloroethanol in blood before a workshift in the same way, but it probably would not affect urine values between the begiiming and the end of the workshift because of the slow excretion rate of TCA. 

Leptin is not the only player in regulation of food intake. There are several other players, including insulin and a number of hormones secreted by the gut. Insulin plays a key role. The blood levels of insulin are proportional to the amount of body fat. Insulin acts in the brain to decrease food intake. Therefore, insulin also acts to maintain body weight constant in addition to its multiple effects on glucose homeostasis. 

Assuming no change in body weight, or if it occurs adding the energy calculated from the amount of body fat consumed. ... 

The amount of body fat is difficult to measure directly, and is usually, determined from an indirect measure—the body mass index (BMI)— which has been shown to correlate with the amount of body fat in most individuals. (Notable exceptions are athletes who have large amounts of lean muscle mass.)... 

Weight loss produced by dietary restriction in combination with aerobic exercise appears to provide a more optimal weight loss based on improvements in body composition. The amount of body fat lost is proportional to the caloric deficit (i.e., the decrease in intake plus the Increase in expenditure), but the composition of the weight loss is also dependent on the amount of FFB lost. The loss of FFB is reduced by exercise which selectively maintains muscle mass. 

Girls begin menstruating at the onset of puberty, at about the age of 12 or 13, although the onset of menstruation may be earlier or later, depending on the amount of body fat. The first menstrual period is called the menarche during the first few cycles, ovulation may be absent. 

Densitomelry. Densitometry involves underwater weighing. By weighing the subject in air, and when totally submerged in water, one can calculate the density of the subject s entire body. Work over the course of the decades has produced a formula that relates this density to the total amount of body fat. 

Chlorofluorocarbons have low dermal absorption characteristics. Absorption by the lungs is slow (based on data collected from animal studies). The main factor affecting distribution of chlorofluorocarbons in an individual is the amount of body fat. Chlorofluorocarbons are concentrated in the body fat and are slowly released into the blood at concentrations that do not present a risk of cardiac sensitization. 

Insulin is released into the blood from the beta cells in the pancreas in response to the rise in blood sugar following a meal. The amount released is to some degree related to the amount of body fat the larger the adipose tissue content of the body, the greater the insulin release (Heini et al. 1998). 

As indicated above, cholinesterase levels rise with the amount of body fat. On the other hand, there is always a reduction of esterase levels under conditions of starvation (E5, S34), as for instance in kwashiorkor (B4, S35). Since in starvation there is a general tendency for the blood volume to shrink before there are major changes in the concentrations of blood constituents, the possibility must be considered that the reduction in the actual amount of cholinesterase protein is much greater than may be suggested by the reduction of cholinesterase activity per unit volume of plasma. 

Poor Barbie. Children love her, but grown-ups just won t stop picking on her. She s been accused of all kinds of crimes. Researchers at University Central Hospital in Helsinki took Barbie s measurements and concluded that her thighs, hips, and stomach were too small. As a real live woman, she d lack the amount of body fat — 20 percent — necessary to have regular periods. Little girls who tried to emulate Barbie could become candidates for anorexia nervosa, the researchers claimed. Give me a break. 

Chlordane residues stored in fat in the human body are probably innocuous. It is possible that toxicity may occur when stores of body fat are mobilized in response to stress or dieting, or in the case of nursing mothers, who mobilize substantial amounts of body fat to maintain lactation, although examples were not located in the available literature. 

The body is 45-75% water (by weight), the percentage depending on a number of factors, including age, sex, and especially the amount of body fat. In general, the percentage of water increases as fat content deaeases. 

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