Last week I was house-sitting for Dr. Gibson.

In the centre of his house is a fireplace. One which I just could not get to stay lit…

…And it made me think of how the body uses the energy contained within different types of food.

Actually, I first heard this concept several years ago from Nora Gegaudas – it’s funny how stuff comes back into conscious thought when you’re absentmindedly trying to start a fire…

Our bodies burn fuel to give us energy, just like a fireplace burns wood to give us heat.