Though this would equate to a pound weught Highly processed foods and added sugar should be kept to a minimum in any healthy weight loss plan. Mayo Clinic. Low-calorie diet for long-term weight management balanced 1,calorie duet rich in nutritious foods Developing habits for optimal performance the needs managemnet many people Natural fat burners want to lose fat and improve health. But this may not be ling-term nutrition for some. When trying to lose weight, creating a calorie deficit either by eating less or increasing physical activity is necessary. Many people choose to follow a 1,calorie diet plan to jumpstart weight loss and control their food intake. This article explains how to follow a 1,calorie diet, including foods to eat, foods to avoid and tips for healthy, long-term weight loss.