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Obesity is defined as having a Body Mass Index (BMI) of greater than 30. The BMI is calculated by the body mass or weight in kilograms divided by the height of the person in metres squared. A healthy BMI should be between 18.5 and 24.9. The NHS website has a handy calculator that will calculate it for you using imperial or metric measurements. These days it is considered a somewhat crude assessment tool, and can be misleading, but still gives an idea of your weight situation, and likelihood for being obese. Muscle weighs more than fat, so if you take a lot of exercise and have a lot of body muscle, this can sometimes make your BMI increase, but lean healthy muscles are naturally preferable to body fat.A reduction in fat, or body mass, is achieved by reducing food intake (eating fewer calories) or by increasing food expenditure (through more physical activity). In practice, the combination of both maintains muscle mass so that body fat is used to provide the energy that the body needs. Without exercise any loss in body mass will include a reduction in muscle protein. It is the muscles in your body that use energy from food, so any weight loss programme should address this to ensure that you are not metabolising the useful muscle component of your body.Seeking advice from a specialist, medically-led weight loss clinic is probably the safest and most reliable method of achieving life changing weight loss without resorting to bariatric surgery procedures such as gastric banding, sleeve gastrectomy or gastric bypass. However, it can be expensive. Generally, slimming down with a bespoke weight loss programme, including medication, can be costly, but if it can help you to regain long-term control of your eating, then it is worth consideration. The OMA has worked out that paying for a medically-led weight loss treatment programme might only be as costly as paying for ineffective medication or supplements, which could be harmful, or for any other weight loss course of food supplements or meal replacements (shake drinks etc.) or diet meal plans, all of which are widely available online and through high street chemists. The most important benefit from seeking professional help is the input you will get from a medically qualified practitioner, who is motivated to help you to lose weight responsibly and successfully, whilst also considering all medical concerns. Bariatric surgery is also available privately, but is more expensive than a specialised diet, exercise and medication programme for weight loss. Surgical options are the last resort for successful weight loss.