Sweat and weightloss

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Many people assume that sweating more means they are burning more calories, but sweat itself is not a direct measure of calorie expenditure. Sweating is the body's natural cooling mechanism and can vary based on temperature, humidity, genetics, and fitness level. While intense exercise often causes both increased sweating and higher calorie burn, the amount you sweat does not determine how many calories you are burning. Any weight lost through sweating is primarily water weight and is usually regained after rehydration.

Source

Gutiérrez, Angel & Mesa, Jose & Ruiz, Jonatan & Chirosa Ríos, Luis & Castillo, Manuel. (2003). Sauna-induced rapid weight loss decrease explosive power in women but not men. International journal of sports medicine. 24. 518-22. 10.1055/s-2003-42017.

Additional Reading

https://www.healthline.com/health/does-sweating-burn-calories

https://www.healthline.com/health/does-sweating-burn-calories

https://www.medicalnewstoday.com/articles/does-sweating-burn-calories