- Over 1/3 of US adults are obese and another 1/3 are overweight, putting them at risk for health issues like heart disease and diabetes. - Portion sizes, especially at restaurants, have increased and contribute to weight gain. The top sources of calories for Americans are grain-based desserts, yeast breads, and chicken dishes according to a National Health survey. - While foods like candy contribute few calories, focus on low-calorie, nutrient-dense foods like fruits and vegetables is important for weight maintenance or loss. Knowing which foods contribute the most calories personally helps target areas for reduction and replacement.