On the credit card issue that you raised, I thought the analogy was interesting, why you and not me.
There is certainly a body of people in the medical world—most of them in this area have worked in molecular medicine—who consider these levels of nutrition that most people take as normal, but some people are actually vitamin dependent and need more. When you're compounded with stress, and maybe not the kind of thing that would qualify for a post-traumatic stress disorder diagnosis, but the operational stuff, sleep deprivation and all the changes that happen when you're in that kind of environment, might explain why somebody suddenly has a much greater need for nutritional support than they would have in a non-combat or a non-operational theatre.