In Walker v SITA Information Networking Computing Limited the Employment Tribunal determined that an obese employee who suffered from various symptoms was disabled.

Obesity alone does not automatically amount to an impairment for disability discrimination purposes, but if someone is obese, it may make it more likely that they have a disability and give a tribunal a greater opportunity to decide that they are disabled.

Employers should therefore, bear in mind that when considering whether someone is disabled the important consideration is the effect of the impairment, not the cause of the impairment.