From what I've read in research about GLP's, and I admit there's less info on retatrutide specifically, there doesn't seem to be a significant overall effect on mood, depression, or suicidal thoughts. Except, mood improves with weight loss, whatever the cause. People respond differently, and there are anecdotal stories of fatigue or loss of pleasure. Mood is also very responsive to placebo effects. Antidepressant trials often show a 70% positive response for the drug and 50% for the placebo. I think that this effect is probably stronger than any actual biological effect on mood, so what you EXPECT going into using the medications is important. Since the original poster was worried about the effects on mood BEFORE starting reta, they might be experiencing a nocebo effect. The studies suggest there is no substantial effect on mood except for IMPROVING it once weight loss occurs. Don't worry about it unless it happens, and then you can stop or try a different GLP.