outcomes.
A focus on results often suggests the possibility of failure. If you don’t do as well as you want, you might be disappointed. Disappointment is a state produced by a failure to predict an adequate reward and, as such, leads to a negative state (in contrast with a pleasant surprise that increases the amount of dopamine our brain releases). Some people only need a small experience with disappointment to be unwilling to take risks or pursue results (Tzieropolous et al., 2011, The impact of disappointment in decision making: inter-individual differences and electrical neuroimaging). While this might appear as a good thing when seeking to reduce dopamine levels, in practice, it drives us to the other extreme and can put a big dent in our plans for self-improvement and growth.
When you focus on the process, you can save yourself the disappointment. You will fulfill the goal anyway and reduce the likelihood of being demotivated by the results not being up to snuff.