|
 |
|
|
|
Exercise is great - especially watching other people do it! |
|
|
|
|
|
Kate looks like she's being very lazy - but she's actually using up energy just by sitting down and watching Fearne on the television. Energy comes from food. |
|
|
|
|
|
See these candles, just burning away? Well, exactly the same thing is going on inside Fearne's body. The biscuit that she's eating is burning too. Here's how... |
|
|
|
|
|
...the first stage of digestion is chewing. The biscuit is chewed up. |
|
|
|
|
|
Then, saliva is added to break it down. |
|
|
|
|
|
Once the biscuit has been swallowed, it gets smothered with acid in the stomach, and pummelled about, ready to be burnt up... |
|
|
|
|
|
...a bit like this. Eww! |
|
|
|
|
|
When a lighted match is dropped in, it just goes out. Oxygen is the key to burning. No oxygen - no burning. |
|
|
|
|
|
This is easily proven with a small candle. Putting a lid over the candle limits the amount of oxygen available to the flame, and it eventually goes out. |
|
|
|
|
|
So what about food burning? |
|
|
|
|
|
This biscuit is the same as the one Fearne has been eating. |
|
|
|
|
|
This container is filled with liquid oxygen. The biscuit is submerged in the oxygen. |
|
|
|
|
|
And then, when the biscuit is set on fire... |
|
|
|
|
|
So food does burn spectacularly well when mixed with oxygen. |
|
|
|
|
|
Food mixes with oxygen inside your body, in your blood. There's no spectacular fire, but it does burn in tiny amounts very slowly to keep up your energy levels. |
|
|
|
|