Hormonal
High-fat diet exposure causes reduced hypothalamic mTORC1 signaling, which contributes to leptin resistance and diet-induced obesity.
This research suggests that chronic high-fat intake disrupts a specific brain signaling pathway (mTORC1) that tells your brain you are full. This disruption leads to resistance to the hormone leptin, making it harder to regulate appetite. While this is a rodent study, it implies that dietary composition (specifically fat content) directly impacts brain signaling mechanisms that control hunger and weight.
Overall, these findings point strongly to the possibility that reduced hypothalamic mTORC1 signaling contributes to the development of hyperphagia, weight gain, and leptin resistance during diet-induced obesity.
Why this rating
Strong experimental evidence using rodent models, Western blotting, and genetic knockouts, though translational to humans is not directly tested.
Source
The Role of Hypothalamic Mammalian Target of Rapamycin Complex 1 Signaling in Diet-Induced Obesity
Daniela Cota et al. · Journal of Neuroscience · 2008
DOI 10.1523/jneurosci.1389-08.2008
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