Obesity can be covered by the definition of disability in the Disability Discrimination Act.
The law defines a ‘loss of functioning of a person's body or part of the body’ as a disability. Therefore, a person whose weight impairs his or her functioning would be covered.
It is against the law to discriminate against a person because of their disability. There are some limited exceptions and exemptions.
It is not unlawful discrimination to discriminate against an employee on the basis of their disability if the person cannot perform the inherent requirements of a job after reasonable adjustments have been made.