Our expert says:
No, it's not true. Sweating has little to do with weight loss and everything to do with the environmental conditions. If it's hot and humid, then we tend to both sweat more, and drip sweat more (rather than evaporate it), which makes it look like we're sweating more. That's why a plastic bag makes it look like you're sweating more than you are.
Where there is a link between sweating and weight loss is that the harder you exercise, the more you sweat. And, the harder you exercise, the more calories you burn. So if you for example run for 30 minutes and cover 6km, you'll sweat more than if you only cover 5km, and you'll burn more calories. That, over time, translates into more weight loss (assuming diet plays along).
But, the key is that it's not the sweating causing the weight loss, but the exercise causing the sweating, AND the weight loss.
So trying to buck the system by wearing plastic bags won't change weight loss much at all - rather focus on getting fitter, running a little faster, and accumulating time. And diet is vital in all this, so that's maybe a top priority.
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