47. although francesca has been obese for as long as she can remember, she is determined to lose excess body weight with a low-calorie diet. when dieting, francesca is most likely to have difficulty becoming and staying thin because :

Her body has more fat tissue than muscular tissue. Fat tissue needs fewer calories than muscular tissue to be maintained.

Explanation:

Fat does not need a high number of calories to be maintained so with a low-calorie diet her fat tissue is receiving the right amount of calories to not be modified. The diet should be paired with exercise to lose fat and build muscles, which needs more calories to be maintained. In other words, she will lose fat, build muscles and burn more calories.

i think its pulmonary not sure tho