Here's a much more detailed discussion of this idea, and possible loopholes: http://www.gwern.net/Drug%20heuristics http://www.gwern.net/Drug%20heuristics For

Here's a much more detailed discussion of this idea, and possible loopholes: http://www.gwern.net/Drug%20heuristics http://www.gwern.net/Drug%20heuristics For example, evolution could easily have failed to make enhancements that would burn too many calories, because food used to be scarce.