As I understand it sweating is just fluids escaping your pores in order to cool the skin and has no effect in weight loss since you will recoup that fluid weight the next time your take a drink.
Burning calories is linked to physical activity. Think of the simple formula of calories in vs calories out. If you go for a 50km bike ride and eat a supersize Mcdonald's meal then you have achieved nothing (except to strengthen your legs and butt). If you do the ride and eat lean meat, fruit and salad then you have burned more calories than you are taking in - weight loss is imminent.
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