Mood Swings and Feeling Flat on a GLP-1: My Honest Account

The Tuesday I snapped over a cereal bowl

My son poured the milk before the cereal. That was it. That was the whole crime, and I heard my own voice go somewhere I did not recognize, and then I stood at the sink with my back to the kitchen feeling like the worst version of myself.

I want to say up front that two completely different things happened to my mood on this medication, and lumping them together is why the internet is so unhelpful about it. There were the spiky weeks. And then, months later, there was the flat stretch, which was quieter and bothered me more.

The spiky weeks

Mine landed on dose-increase weeks, almost every time. I felt short-fused, tearful at things that did not warrant it, and generally like my skin was on inside out.

I cannot tell you a drug mechanism for that, because I do not think anyone can. What I can tell you is what else was true in those same weeks: I was nauseated, I was eating a fraction of what I used to, I was sleeping badly, and I was quietly frightened about whether this was going to work. Any one of those makes me a worse person to live with. All four at once, on a Tuesday, and the cereal bowl never stood a chance.

They passed. Every single time, they passed within about a week of the dose settling. Once I could predict them, they stopped feeling like evidence about my character.

What the research actually says — and what the label just did

This is the part I would want a friend to have.

There was a real scare in 2023 when European regulators started looking at reports of suicidal thoughts on these medicines, and for a while every article about GLP-1s carried it. Since then the large studies have not backed it up. A retrospective cohort of about 240,000 people with overweight or obesity found semaglutide was associated with a lower risk of suicidal ideation than other anti-obesity medicines, not a higher one, and the finding held when it was replicated in over 1.5 million people with type 2 diabetes¹. A Spanish population cohort using a propensity-weighted design found no evidence of increased risk either².

And here is the thing I did not expect to find when I went to check: the Wegovy label no longer carries a suicidal-behavior warning at all. Section 5.10 used to be "Suicidal Behavior and Ideation." The current label lists that section as removed as of February 2026, and 5.10 is now something else entirely³. The word "depression" does not appear in the label anywhere.

That is not nothing. Labels do not shed warnings casually.

The flat part, which nobody has studied

Now the half I have no evidence for, and I am going to say so rather than dress it up.

Around month five I noticed I was not exactly sad. I was muted. Things that used to give me a small lift — a good coffee, a text from my sister, the first warm Saturday — arrived and landed softly. My husband asked if I was okay and I could not think of a single thing that was wrong, which is a strange sentence to say out loud.

My honest guess is that it is connected to the appetite quieting. These drugs measurably change how much you eat and how you feel about food⁴, and food was doing a lot of emotional work in my life that I had never once counted. Take that out and there is a gap, and for a while nothing filled it.

But that is a guess. There is no trial on emotional blunting and GLP-1s. There is no number I can give you. If anyone online is telling you confidently why this happens, they are ahead of the evidence, and so would I be.

It lifted for me around month eight, mostly because I went looking for other things to put in the gap. That is the least satisfying answer I have ever written down, and it is the true one.

When I would stop reading and make a call

None of the above is a reason to sit with something that is getting worse. Contact your clinician promptly for new or worsening depression or anxiety, or any thoughts of harming yourself — and if you are in crisis, call or text 988, the US Suicide & Crisis Lifeline. That line is not a formality. Mood is not a symptom to tough out, and a rough patch that keeps going is not you failing at gratitude.

If you have a history of depression or anxiety, say so before you start rather than after, and say it to someone who can see your whole chart and not just your weight. I have the rest of the body stuff in what nobody told me about the women's side effects, and if what you are actually describing is exhaustion rather than sadness, the tiredness is its own piece with its own answer.

Where this left me

The spiky weeks were real, predictable, and temporary. The flat stretch was real, unstudied, and longer. Neither made me want to stop, and I would have handled both far better if one person had told me in advance that they were two separate things.

Consider yourself told.