Yulia is twenty-four years old. She has been fit and lean her whole life and recently has begun to put on an unhealthy amount of weight. She goes to her doctor because she is not eating any differently than she has before, yet she is now heavier. What will Yulia’s doctor most likely tell her?

AAdults need fewer calories than kids and teens, so she needs to eat less.

BAdults need more calories than kids and teens, so she needs to eat more.

CAdults are heavier than kids and teens.

DAdults need more exercise than kids and teens.