On the other hand, on the show Alone a few seasons back the medical staff had to pull someone who had weeks worth of smoked fish saved up yet was risking serious organ damaging due to malnutrition. Even though he had plenty of food he was simply rationing too strictly and had lost over 20% of his bodyweight in a matter of weeks. Point being, it's possible to put oneself in danger despite having the resources to avoid the risks.

I wonder if he was fasting or starving himself and ran into unexpected trouble. For example pg 17 has some detailed nutritional data on something, maybe an idea for a protein bar?.