This story is self contradictory. You say the last thing you ate was a lizard nine days ago, and you also say you had a Twix and half a bag of Fritos today.

You wouldn't be doing kickline tryouts if you were starving to death, nor would you turn down food that was offered to you because it wasn't good enough, or waste money on diet coke, or anything else with zero calories.

The body does generate less heat when you've been in caloric deprivation for a period of time, but the core body temperature is 98.6°F, so if "sweltering heat" is higher than that, you wouldn't be shivering cold.

So it's obviously not all true. It's hyperbolic. What are you trying to communicate?