Hormonal
In morbidly obese humans, insulin resistance is associated with significantly lower AMPK activity and higher oxidative stress (protein carbonylation) in adipose tissue compared to insulin-sensitive obesity, regardless of fat depot.
For morbidly obese individuals, achieving weight loss is a step, but metabolic health (insulin sensitivity) is distinct. Research suggests that insulin-resistant obesity involves lower AMPK activity and higher oxidative stress in fat tissue. While this paper is observational, it highlights that metabolic health is not just about weight but about how fat tissue functions at a molecular level. Interventions that improve AMPK activity (like exercise) may be crucial for improving insulin sensitivity beyond just weight loss.
Thus, adipose tissues of markedly obese insulin resistant individuals uniformly show decreased AMPK activity and increased oxidative stress compared with insulin sensitive patients.
Why this rating
Observational study with a small sample size (n=16) but rigorous biochemical assays (Western blot, PCR arrays) and statistical adjustments.
Source
Insulin sensitive and resistant obesity in humans: AMPK activity, oxidative stress, and depot-specific changes in gene expression in adipose tissue
X. Julia Xu et al. · Journal of Lipid Research · 2012
DOI 10.1194/jlr.p022905
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