The answer can be both increase in self-esteem and increase in aggression. All of the research generally points to increase of self esteem because during puberty self awareness is very prominant which increases self esteem. I would be safe and go with self esteem. I hope this helps.
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In understanding the difference between health and wellness, in short, health is a state of being, whereas wellness is the state of living a healthy lifestyle (3). Health refers to physical, mental, and social well-being; wellness aims to enhance well-being.