Obesity is the second leading cause of death after smoking. It is associated with an increased mortality rate of all ages including children. Losing weight though commercialized is still to your benefit if you carry more weight than you should.
Obesity and overweight are term often used interchangeably. However, technically they refer to two different states.
Being overweight technically means excess body mass. This includes all the body tissues. Obesity on the other hand refers explicitly to excess body fat e.g. a professional heavy weight body builder is overweight because of excess muscles but is not obese.
Obesity is what should concern you. Losing weight is no longer an issue you can afford to procrastinate, and probably a good health scare is in order.