If you want to become thinner and healthier. You should eat food and take exercise.A. less

问题补充：

If you want to become thinner and healthier. You should eat food and take exercise.

A. less; fewer

B. more; less

C. fewer ;more

D. less; more

答案：

A. less; fewer

B. more; less

C. fewer ;more

(答案→)D. less; more

解析：food 与exercise 均为不可数名词，fewer 不能用，再根据意思，选D