Weight loss without diet and exercises. To many people, it sounds like a dream come true. However, every dream has a price to pay for. A sudden weight loss without much effort means that something is really wrong with your body. Serious metabolic issues or potentially lethal diseases, like cancer, AIDS and congestive heart failure make body mass fade away. Experts recommend having a thorough check-up in case you have lost 5 to 10 percent to your weight within 3 to 6 months. Even if you are not in the habit of weight watching, baggy clothes and visible bones is a good reason to check your weight and see a doctor as soon as possible. Here we have the list of the most obvious reasons for the weight loss. Some are quite transparent, such as stress or malnutrition. While others can be far more serious, such as cancer, depression or AIDS. Read on to make sure that you might be losing weight for own reasons.