The DNA molecule contains a lot of chemical structures that tell the ribosomes how to create new proteins (that have a lot of functions).
Plus, you can benefit from fat burning even after your run as your body keeps burning fat for 2 to 3 hours after finishing a run. If you want to shed a few pounds, make sure you only ingest liquids and maybe a little protein during that time frame. Training on an empty stomach.
Most people operate under the assumption that the more they run, the more weight they'll lose. That's true, but only to a point. Running is an incredibly effective and efficient form of exercise for burning calories. (You burn about 8.5 calories a minute when moving at a comfortable pace.)