In obese adults with heart disease but no diabetes, taking a weekly 2.4 mg dose of semaglutide was linked to an average treatment duration of 34.2 months and follow-up of 39.8 months in clinical...
Mechanism
Synthesis from 1 study
The drug keeps you from feeling hungry, so you eat less. That makes your body burn fat, which creates more harmful byproducts, but you don’t get enough protein or vitamins to fix the damage or keep your muscles strong. Still, because you’re not hungry, you keep taking the drug — even though your...
Most probable mechanism
The drug makes you feel less hungry, so you eat less. With less food, your body starts burning fat for energy, which creates more waste chemicals called free radicals. At the same time, you're not getting enough protein or vitamins, so your body can't repair itself well or fight off those waste chemicals. This causes muscle loss and puts stress on your cells, but your body still keeps using the drug because the appetite suppression keeps you taking it.
GLP-1 receptor agonists bind to receptors in the brain and gut, suppressing appetite and delaying gastric emptying
Reduced food intake lowers the availability of dietary nutrients, including amino acids, vitamins, and minerals
Lower nutrient availability forces metabolism to rely more on fatty acid oxidation, increasing mitochondrial electron flux and reactive oxygen species production
Reduced intake of amino acids like cysteine limits the synthesis of glutathione, weakening cellular antioxidant defenses
Low nutrient levels activate AMPK, which inhibits mTOR signaling, reducing muscle protein synthesis
Micronutrient insufficiency impairs the function of enzymes involved in energy production and antioxidant defense
The combined reduction in antioxidant capacity and protein synthesis creates a state of sustained cellular stress, but continued drug use is maintained due to persistent appetite suppression
Less supported by current evidence, but not ruled out
The drug may cause low-level inflammation in fat tissue, which activates enzymes that use up a key molecule needed for energy and repair. With less food, the body can't make enough of this molecule to keep up, so cells struggle to produce energy and fight damage.
Chronic GLP-1 receptor activation sustains low-grade inflammation in adipose tissue
Inflammatory signaling increases activity of NAD+-consuming enzymes like PARP-1 and CD38
Reduced dietary intake limits precursors needed to regenerate NAD+
NAD+ depletion reduces mitochondrial ATP production and cytosolic NADPH-dependent antioxidant recycling
Persistent NAD+ imbalance contributes to cellular stress without halting drug adherence due to continued appetite suppression
Evidence from Studies
Supporting (1)
Community contributions welcome
Semaglutide and Cardiovascular Outcomes in Obesity without Diabetes.
Contradicting (0)
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Gold Standard Evidence Needed
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