From fitwoman.org:
Healthy Weight Week was created 23 years ago to help people understand that health really isn’t about a number – on the scale or otherwise – and to encourage people to stop dieting and pursue livable and sustainable healthy lifestyles through eating well, living actively and feeling good about themselves.
Your healthy weight is your natural weight, which is largely determined by your genetics. If you come from a family of larger or smaller people, you are likely to be larger or smaller. Achieving and maintaining your healthy weight is supported by healthful, enjoyable living that includes mindful, pleasurable eating and physical activity, effective stress management, adequate sleep and more. It is not a weight that is achieved through restricting what you eat or excessively exercising in order to lose weight.