Read the paragraph below from the section "Brains Under Construction." (Newsela - Warning: Junk food can harm a teen's brain).
Those receptors relay the "feel-good" signal from the last cell to this new one. That tells the brain that whatever it just experienced is worth getting more of. Adolescents have more dopamine receptors in the brain than adults. So, they get more good feelings from enjoyable things.

What conclusion can the reader make based on this paragraph?