Did you play any first person shooter games? You know that you restore health by eating a heart-like symbol. What if future food it will be just like that? Just eat one pill and that’s it, you’re filled to 100% health.
This is one of my wet dreams: to build a DIY autonomous raspberry pi v2 drone that can power itself with solar panels. Sounds like a terminator skynet, right? If it ever starts to build itself (replicate on its own will), then the singularity will arrive!