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Related Concept Videos

Obesity01:24

Obesity

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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Drug Dosing: Obese Patients01:21

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In the United States, obesity is a prominent concern. It is linked to heightened mortality rates due to increased occurrences of conditions such as hypertension, atherosclerosis, coronary artery disease, and diabetes compared to nonobese individuals. A patient is classified as obese if their actual body weight surpasses the ideal or desirable body weight by 20%, based on Metropolitan Life Insurance Company data. Ideal body weights consider average weights and heights for males and females...
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Pharmacokinetics in Obese Patients: Drug Absorption and Distribution01:25

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Obesity significantly alters the pharmacokinetic processes of drug absorption and distribution, presenting unique challenges in medical treatment. The increased fat tissue and decreased lean muscle in obese individuals can significantly affect how drugs are absorbed into the body and distributed across different tissues. This alteration can lead to variances in the effectiveness and safety of medications, necessitating adjustments in dosing or drug selection for obese patients.One notable...
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Infertility in Females01:28

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Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
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Infertility in Males01:23

Infertility in Males

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Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
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Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion01:20

Pharmacokinetics in Obese Patients: Drug Metabolism and Excretion

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Drug metabolism, a critical process in the liver, involves two primary phases: Phase I reactions and Phase II conjugation. Obesity introduces significant alterations in this metabolic process, primarily due to fatty infiltration of the liver, leading to conditions such as nonalcoholic fatty liver disease (NAFLD). This condition can modify the activities of both Phase I and II enzymes, impacting how drugs are metabolized in obese patients.Phase I metabolism sees variable effects across...
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Related Experiment Video

Updated: Apr 28, 2026

Assessment of Child Anthropometry in a Large Epidemiologic Study
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Fatness and fertility: which direction?

Stephanie B Seminara

    The Journal of Clinical Investigation
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    Summary
    This summary is machine-generated.

    The kisspeptin hormone pathway, crucial for sexual maturation, also regulates metabolism. Mice lacking the kisspeptin receptor gained weight due to decreased energy expenditure, not increased appetite.

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    Area of Science:

    • Reproductive endocrinology
    • Metabolic regulation
    • Neuroendocrinology

    Background:

    • Metabolic status is traditionally viewed as a determinant of reproductive function.
    • Aberrant metabolic phenotypes can disrupt reproductive processes, including puberty onset.
    • The role of reproductive hormones in metabolic control is increasingly recognized.

    Purpose of the Study:

    • To investigate the role of kisspeptin signaling in metabolic regulation.
    • To determine if kisspeptin influences energy balance and metabolism.
    • To explore the link between the kisspeptin pathway and reproductive status.

    Main Methods:

    • Utilized female mice genetically engineered to lack the kisspeptin receptor (KISS1R).
    • Compared body weight gain and energy balance parameters between mutant and control mice.
    • Assessed food consumption and overall metabolic rate.

    Main Results:

    • Female mice lacking KISS1R exhibited significantly greater weight gain compared to wild-type controls.
    • This weight gain was attributed to a reduction in overall energy expenditure and metabolic rate.
    • No significant increase in food intake was observed in the mutant mice.

    Conclusions:

    • The kisspeptin signaling pathway plays a direct role in regulating metabolic rate and energy balance.
    • Disruption of kisspeptin signaling leads to decreased metabolism and subsequent weight gain.
    • Further research is warranted to ascertain the contribution of kisspeptin pathway alterations to human obesity.