Final answer:
The statement is an example of all-or-none thinking, which is a cognitive distortion that ignores gray areas and views situations as either complete success or total failure.
Step-by-step explanation:
The statement, "I ate way too much on vacation, so I might as well give up on my weight-loss goal," is an example of all-or-none thinking. This cognitive distortion involves viewing situations in only two categories rather than on a continuum. The individual thinks that if they cannot adhere perfectly to their diet, then they have completely failed, ignoring the gray area and the possibility of getting back on track after a temporary setback. Recognizing this pattern is crucial for those trying to maintain healthy habits, as it can lead to a more balanced and forgiving approach to weight management.