From an evolutionary perspective, what does it mean to say that depression is adaptive?

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According to the theory of evolutionary psychology, depression is adaptive because it helped our ancestors solve problems related to social exclusion, resource allocation, and other challenges faced in their environment. By feeling depressed, individuals may have conserved energy, withdrawn from social situations that could be harmful, or signaled a need for help or support from others. This allowed them to focus on solving problems and improving their chances of survival and reproduction in the long term. Therefore, depression is not necessarily a negative or useless trait, but a functional response to specific environmental pressures.

From an Evolutionary Perspective, What Does It Mean to Say