Ideally, yes. However, it also depends on your hunger or satiety levels and your goal. If weight loss is your goal, it can be ok to eat less than recommended. You should still watch your protein intake and try to match the goals. Eating far below the recommendations may make it difficult for you to adhere to the program and poses the risk for ravenous appetite. Therefore, it is recommended to stick to the plan.
If your goal is to build muscle, you should definitely eat up. If you're having a hard time consuming so much food, you can try high caloric shakes and energy dense foods like nuts.
