Thank you for bringing this up — it's an underreported concern that deserves more attention.

There are several potential mechanisms at play:

1. GLP-1 receptors exist in the brain, including areas involved in mood regulation (amygdala, hippocampus, hypothalamus). Activating these receptors can theoretically influence emotional processing.
2. Caloric restriction itself affects mood — reduced carbohydrate intake can decrease serotonin precursor availability (tryptophan), potentially undermining the effect of your sertraline.
3. Blood sugar fluctuations — more stable glucose is generally good for mood, but the transition period can involve episodes of relative hypoglycemia that trigger anxiety symptoms (heart racing, restlessness, irritability).
4. Absorption of sertraline — this is the one I'd focus on. Delayed gastric emptying can theoretically alter the absorption of oral medications, including SSRIs. If your sertraline isn't being absorbed as effectively, your anxiety management could be compromised.

My recommendations:

• Contact your prescriber (the one managing your sertraline) ASAP
• Do NOT stop sertraline abruptly
• Consider checking sertraline blood levels if available
• Ensure you're eating enough — undereating and mood disorders are tightly linked
• Track your mood in relation to your injection day — if there's a clear temporal pattern, that's useful clinical data

YES. Oh my god, I thought I was alone. I'm on semaglutide, not tirzepatide, but the anxiety increase has been significant. I have GAD and was stable on escitalopram for 2 years. About 6 weeks into sema, my anxiety spiked badly — intrusive thoughts, difficulty sleeping, general sense of dread.

My psychiatrist's theory was the caloric restriction + altered absorption. We increased my escitalopram from 10 to 15 mg and the anxiety improved significantly within 2 weeks. So the medication adjustment helped, which supports the idea that the GLP-1 was undermining the SSRI somehow.

I experienced mood changes too — not so much anxiety but weirdly flat affect. Like food was such a big part of my emotional life (comfort eating, social eating, celebratory eating) and suddenly that was just... gone. And nothing replaced it. I felt like a robot for about two months.

What helped me was being intentional about finding non-food sources of pleasure and dopamine. Exercise helped (endorphins are real). Hobbies I'd neglected. Time with friends doing activities rather than just eating. Therapy specifically focused on my relationship with food and the identity shift of losing weight.

I think we underestimate how psychologically disruptive it is to have your appetite — something so fundamental to being human — chemically altered. Even when it's medically beneficial, it's a big change.

The "food noise" going away was actually amazing for my anxiety at first — my brain was quiet for the first time in decades. But then I realized I'd been using food to self-medicate my anxiety, and without that coping mechanism, the underlying anxiety was just... exposed. Raw. Unmanaged.

Had to start actual therapy for the first time because the food band-aid was gone. Honestly, it's been one of the unexpected benefits — I'm dealing with stuff I'd been burying under binge eating for 20 years. But the transition was ROUGH.