That maybe true but conversely how many extra shifts have Overweights picked up because of sports injuries and sports detachments.
I think you will find my reference was simply to regular exercise and a healthy diet, not specifically to playing sport. In fact I have advised people to avoid certain sports if they are in operationally critical roles, and are to be deployed in the near future. However if they are playing sports, at least they are more likley to have their injury prior to deployment as opposed to during a deployment. Again I have seen this first hand several times, where unfit individuals have been a burden to their detachment due to injury on ops as a direct result of their lack of physical condition. I have also seen more often than not, those who get sick, and more importantly stay sick for a longer period of time, are more often found to be overweight and in poor physical condition.