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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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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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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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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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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
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Assessment of Child Anthropometry in a Large Epidemiologic Study
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Overweight Is Associated With Medium-Term Obesity Development in School-Age Children: A Mixed Longitudinal Study.

Raphael Gustavo Testa1, Adeluci Moraes1, Aline Giselle Nagafuchi1

  • 1Research Group in Physiology and Physical Activity, University Pitágoras UNOPAR Anhanguera, Londrina, Paraná, Brazil.

American Journal of Human Biology : the Official Journal of the Human Biology Council
|November 30, 2025
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Overweight school-age children are at significantly higher risk of developing obesity within two years. Early intervention is crucial for preventing childhood obesity and its long-term health consequences.

Keywords:
longitudinal studynutritional statusobesity developmentschool‐age children

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Area of Science:

  • Pediatric Nutrition
  • Childhood Obesity Research
  • Growth Monitoring

Background:

  • Childhood overweight and obesity are significant public health concerns.
  • Understanding the progression of nutritional status in children is vital for developing effective interventions.

Purpose of the Study:

  • To investigate the dynamic changes in nutritional status among school-age children over a 7-year period.
  • To identify risk factors associated with the development of obesity in children aged 6-11 years.

Main Methods:

  • A mixed longitudinal design with five cohorts and a 2-year follow-up was employed.
  • 101 children aged 6-11 years had anthropometric measurements taken to determine Body Mass Index (BMI) and nutritional status.
  • Nutritional status was categorized using established age- and sex-specific cutoff points.

Main Results:

  • Prevalence rates were 22% for overweight, 10% for obesity, and 5% for underweight.
  • Children identified as overweight at baseline had a significantly higher likelihood (4.7 times) of developing obesity within two years.
  • A significant association was found between initial overweight status and subsequent obesity development (χ² = 5.325, p = 0.021).

Conclusions:

  • Overweight status in school-age children is a strong predictor of medium-term obesity development.
  • Findings highlight the critical need for early intervention and targeted preventive strategies.
  • Addressing childhood overweight is essential to mitigate the growing public health issue of obesity.