Why Eat less of the nutrient-poor foods (By American Heart Association)

Eat less of the nutrient-poor foods.

The right number of calories to eat each day is based on your age and physical activity level and whether you're trying to gain, lose or maintain your weight. 

You could use your daily allotment of calories on a few high-calorie foods and beverages, but you probably wouldn’t get the nutrients your body needs to be healthy. 

Limit foods and beverages high in calories but low in nutrients. Also limit the amount of saturated fat, trans fat and sodium you eat.

Read Nutrition Facts labels carefully — the Nutrition Facts panel tells you the amount of healthy and unhealthy nutrients in a food or beverage.

Info Source: https://www.heart.org/HEARTORG/GettingHealthy/NutritionCenter/HealthyEating/The-American-Heart-Associations-Diet-and-Lifestyle-Recommendations_UCM_305855_Article.jsp