Frequently asked questions
Short answers to the most common questions about weight, treatment, delivery and costs.
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Overweight & obesity
Experts usually use the body mass index (BMI). A BMI of 25 or more is classed as overweight. BMI is a guide value. It says nothing about your fitness or your worth as a person.
Obesity is considered a chronic disease. It can be treated but usually needs long-term support. This includes nutrition, exercise, sleep, stress management and, where a doctor considers it appropriate, medication.
Yes. The World Health Organization and the German Bundestag recognise obesity as a chronic disease. This means it deserves medical care like any other chronic condition. Blame plays no part.
BMI does not distinguish between muscle and fat and does not show where fat is stored. Additional measures include waist size, waist-to-hip ratio or body fat percentage.
Water retention often changes quickly and shows up, for example, as swollen ankles or fingers. Fat builds up slowly. If swelling persists, get it checked by a doctor.
Obesity can raise the risk of conditions such as type 2 diabetes, high blood pressure, heart disease, joint problems and sleep apnoea. Only a medical examination can tell how high your personal risk is.
Yes, some medicines can affect appetite, water retention or metabolism. Examples include cortisone, some antidepressants or hormonal contraceptives. Never stop a medicine on your own. Talk to your doctor about possible alternatives.
Rapid, unexplained weight gain can have several causes, such as hormones, medication or water retention. Talk to your GP about it. That way the cause can be found.
Overweight starts at a BMI of 25, obesity at a BMI of 30. Obesity is recognised as a chronic disease in its own right. Besides BMI, waist size and related conditions also matter for the assessment.
Obesity is a chronic disease in which too much body fat builds up. A BMI of 30 or more is classed as obesity. It has many causes, such as genetics, hormones, environment, sleep and stress. Willpower alone is not the key.
The body mass index relates your body weight to your height. You divide your weight in kilograms by your height in metres squared. In medicine, BMI serves as a simple first guide value.