Clinical perspective, offered as context rather than as advice.

Anxiety increase on mental health: counterintuitive, but losing weight rapidly triggered anxiety for me. Change — even positive change — is stressful. I was anxious about loose skin.

This is more common than people admit. A therapist who specializes in weight management has been invaluable. Don't neglect the mental health side of this journey.

A narrower follow-up, since the general answer is now clear:

How would you tell the difference between that and the alternative explanation?

Dr.KarenChen said:

Anxiety increase on mental health: counterintuitive, but losing weight rapidly triggered anxiety for me.

Therapy insights from my mental health journey: my therapist introduced me to the concept of "identity updating" — the psychological work of becoming a new version of yourself.

Key realizations: I used food to manage emotions, I had internalized fatphobia that I'm still unpacking, my social identity was partly built around being "the big guy/girl," and learning to accept compliments is surprisingly hard when you've been invisible for years.

Physical transformation without emotional processing is unstable. Do both.

Dr.KarenChen said:

Anxiety increase on mental health: counterintuitive, but losing weight rapidly triggered anxiety for me.

That holds where the measurement is reliable. Where it is noisy — and a lot of what gets tracked here is noisy — the same reasoning produces confident nonsense.

Ask again with the specifics and you will get a better answer than this one.

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