NanoMcChines

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NanoMcChines are molecular machines inserted into the body of a living organism which can alter or enhance components of the being. McDonald's developed prototypes throughout the 1980s and in 1987 they began to be rolled out into the McMilitary. NanoMcChines are nanomachines, the first of their kind. Other groups have since created their own versions.
NanoMcChines are inserted into the host's body, usually via injection into the bloodstream. The nanomachines can accelerate healing, adapt the host's state of mind to the situation, and also slow metabolism. 
In 2004, McDonald's developed variants to be added to food as well. These variants can enhance the taste, nutritional value, and shelf life of the affected food. Currently, McDonald's adds NanoMcChines to food sold at their restaurants and rations handed out to the McMilitary.