Hormonal
Pharmacological activation of AMP-activated protein kinase (AMPK) in the hypothalamus directly stimulates food intake in rodents.
This study identifies AMPK in the hypothalamus as a key driver of hunger. While this is a rodent study using direct brain injections, it suggests that metabolic states which activate AMPK (like low energy availability) signal the brain to increase food intake. For humans, this implies that extreme caloric restriction or metabolic stress might trigger biological hunger responses via this pathway, potentially making long-term adherence difficult.
direct pharmacological activation of AMPK in the hypothalamus is sufficient to increase food intake.
Why this rating
High-quality experimental evidence using in vivo animal models with histological confirmation of injection sites and statistical significance, though not directly translatable to human clinical outcomes without further study.
Source
AMP-activated Protein Kinase Plays a Role in the Control of Food Intake
Ulrika Andersson‐Hall et al. · Journal of Biological Chemistry · 2004
DOI 10.1074/jbc.c300557200
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