People tend to take credit for positive outcomes, on the other hand, they tend to blame outside factors for negative.
For instance, when a person loses weight, they think of it as their effort, even though the actual factor would be skipping meals or losing muscle. On the other side, the reason why they could not go to the gym was that their job was too hard. Self-serving bias can disturb us from analyzing the real factors.

We need to pay attention to that bias to attain our ideal body.
It can have an effect on other topics like learning new things, project management, investing and so on.

I appreciate your reading.
Have a great day.