Why are disabled people excluded from responsibility of this "personal decision?" Disability does not prevent a person from eating less or exercising more.
A lot of disabled people lack arms and legs, or have asthma so bad they can barely walk up stairs, or other varied reasons they are unable to exercise. It depends on the disability. But for the large majority of people that truly have nothing preventing them from exercising and eating right other than willpower, they should realize how blessed they are, and what a privilege it is to exercise.