2. Glucagon Suppression:
GLP-1 medications also suppress the secretion of glucagon, a hormone that normally raises blood sugar levels by signaling the liver to release stored glucose (glycogen) when blood sugar is low.
By reducing glucagon levels, GLP-1 medications help prevent the liver from releasing too much glucose, thereby contributing to better blood sugar control.
GIP has a dual effect on glucagon depending on the blood sugar level:
When blood sugar is high: GIP has a mild suppressive effect on glucagon secretion, helping prevent the liver from producing too much glucose (gluconeogenesis). This complements insulin's action by lowering blood sugar further.
When blood sugar is low: In contrast to GLP-1, GIP can actually increase glucagon secretion when blood sugar is low, which helps prevent hypoglycemia. By promoting glucagon release, GIP ensures that the liver releases glucose into the bloodstream to raise blood sugar levels when needed.
For people with chronic stress and inflammation, GIP medication can be much more effective by keeping glucagon from over-activating.
3. Slowed Gastric Emptying:
Besides modulating insulin and glucagon, GLP-1 medications slow down the rate at which food leaves the stomach, known as gastric emptying.
This helps prevent large spikes in blood sugar levels after meals, further supporting glucose control.
4. Additional Effects:
In addition to its effects on insulin and glucagon, GIP also influences fat storage and usage in the body.
It promotes the uptake of fatty acids into fat cells (adipocytes) and may enhance fat storage.
This is why combination peptide therapy like tirzepatide (known as Mounjaro and Zepbound) can be so effective because they utilize both GLP-1 and GIP peptides with less side effects, especially when micro-dosed.
Why Don't They Always Work?
Now, with all these positive effects in mind, why do these treatments not work for some people?
Peptides can help you get results by reducing "food noise" and slowing digestion.
But, if you're eating even when you're not physiologically hungry, these peptides probably won't help.
When the problem isn't hunger, addressing just food won't fix it.
You need to go deeper to the root cause.
Additionally, if you're not eating enough protein and not regularly strength training, you may start excessively losing muscle mass along with body fat, which lowers your metabolic rate.
Adopting optimal nutrition and training habits on this medication is actually more important than before to avoid sarcopenia (muscle loss) which is correlated with less longevity and health complications into older age.
Peptides are still a tool, just like every other fad and trend that comes and goes, albeit these seem to be more promising than most.
That means, you still have to be implementing the basic science of body composition change (i.e. not over-eating and not under-eating - especially protein), adopting a long-term mindset, making a lifestyle transformation, and building + sustaining sufficient muscle mass to keep your metabolism revved up!
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