See your GP if you're losing weight without trying (Image: Getty) Although many of us would like to lose a bit of weight with no effort, it can be a sign of something more worrying. Rapid weight loss without cutting calories or working out could be a symptom of a serious medical condition, such as diabetes or even cancer . Experts advise that if you unintentionally lose more than five percent of your normal body weight, or more than 10lbs (4.

5 kg) in less than a year, you should consult your doctor. According to the NHS it says: "It might be caused by a stressful event like a divorce, losing a job, or the death of a loved one. It can also be caused by malnutrition, a health condition or a combination of things.

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