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I'm going to sign up for a marathon to help me lose weight

This is the intention of many first time marathoners.  The assumption is something like this: Training for a marathon involves a heck of a lot of running; if I sign up for a marathon really get serious about running, I'll lose a heck of a lot of weight in the process.  The reality is far different from this.  A 2010 research study indicated that of novice marathoners completing a 3-month training program (a time period in which they ran literally hundreds of miles and expended tens of thousands of calories), some people lost weight, some stayed the same, and many gained weight.  Here is a breakdown of what happened: