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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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Metabolic health is more closely associated with decrease in lung function than obesity.

Hea Yon Lee1,2, Hae Kyung Yang2, Ho Jin Song1

  • 1Department of Health Promotion Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.

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Metabolic health, not obesity, is strongly linked to reduced lung function. Metabolically unhealthy individuals showed poorer lung capacity, irrespective of their weight status, highlighting metabolic health as a key factor.

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Area of Science:

  • Pulmonary Medicine
  • Metabolic Health Research
  • Public Health

Background:

  • Previous studies on metabolic syndrome, obesity, and lung function have yielded conflicting results.
  • Understanding the independent and combined effects of metabolic health and obesity on pulmonary function is crucial for public health initiatives.

Purpose of the Study:

  • To compare lung function across different categories of metabolic health and obesity.
  • To investigate the association between metabolic health status, obesity, and pulmonary function parameters.

Main Methods:

  • A cross-sectional study of 10,071 participants was conducted.
  • Participants were categorized into four groups: metabolically healthy non-obese (MHNO), metabolically healthy obese (MHO), metabolically unhealthy non-obese (MUHNO), and metabolically unhealthy obese (MUHO).
  • Metabolic health was defined by the absence of three or more risk factors (hypertension, hyperglycemia, high triglycerides, low HDL cholesterol, abdominal obesity); obesity was defined as a BMI ≥ 25 kg/m².

Main Results:

  • Metabolically unhealthy individuals exhibited significantly decreased lung function (forced vital capacity and forced expiratory volume in 1 second) compared to metabolically healthy individuals, irrespective of obesity status.
  • The metabolically unhealthy obese (MUHO) group showed the highest odds of reduced lung function, while the metabolically healthy obese (MHO) group demonstrated a protective effect compared to the MHNO group.
  • Statistical analysis adjusted for age, sex, and smoking status confirmed these associations.

Conclusions:

  • Metabolic health status is a more significant determinant of impaired lung function than obesity alone.
  • Interventions aimed at improving metabolic health may be crucial for preserving lung function.