There is also a persistent rumour that sweating makes you slim. If only that were true! Unfortunately this belief is wrong. When we sweat, we only lose water – not fat. The weight loss is balanced out even after taking a drink break.Belief number three: It’s not just sport that makes us sweat – spicy food has the same effect. There is some truth to this rumour! Hot spices boost our metabolism and promote the circulation. The body reacts to this by producing more sweat.