Answer:
B
Step-by-step explanation:
Leading a healthy lifestyle does not only require exercise, it also requires being an acceptable weight. If your weight is too high or too low, it can have negative effects on your health.
If Zachary is having a hard time gaining weight from purely eating the three meals a day, a good thing to try would be to eat more energy-dense snacks between meals. Unfortunately some people who are overweight do this and since the snacks are not filling, they keep eating more, not realizing the effects.