During my travels, I have picked up many weapons such as LAMs, 12 Gauge Shotguns and Crowbars. These items have clear uses and need no introduction.

Then there are some other items, such as...Soda, Chocolate Bars, and Soy Food? Clearly, these are not the tools of the trade of a hardcore killing machine...or indeed, of anybody at all, and the game offers no explanation for their existence.

Are these items only pickup-able for the sake of atmosphere and to fill those lonely gaps in my inventory, or do they actually serve a purpose?