Conclusion
IUD, also known as an intrauterine device, is a T-shaped device that is usually inserted into the uterus to prevent pregnancy. It is not completely proven that the hormonal or non-hormonal IUD can lead to weight loss. However, several anecdotal studies show that weight changes could be a side effect of the device.
References
[1] https://www.who.int/news-room/fact-sheets/detail/depression
[2] https://www.nhs.uk/conditions/feeling-sick-nausea/
[3] https://medlineplus.gov/druginfo/meds/a602008.html
[4] https://my.clevelandclinic.org/health/articles/23439-ovulation
[5] https://www.mayoclinic.org/diseases-conditions/insomnia/symptoms-causes/syc-20355167
[6] https://www.mayoclinic.org/symptoms/fatigue/basics/causes/sym-20050894