The present invention is related to the composition and process of making the desired foods with big volume for weight control. Water, hydrocolloids and premix of nutrients are the major ingredients to make the new food with bigger volume than its original formulation. The new food is high in nutrients and low in calorie density for weight loss. The new food can also be high in nutrients and high in calorie for weight gain after adjusting the composition. A new instrument named Meal Cylinder is provided for measuring the quality and quantity of the food, and for food labeling and for nutrition education. Meal Cylinder links everyone's innate ability of the stomach fullness to the quality and quantity of the food. Hence, it has a practical usefulness for weight control. Using Meal Cylinder, one can select the appropriate foods and meals for special purposes. Foods and meals are categorized according to its Meal Cylinder fullness level, as well as its calorie and nutrient cylinder fullness levels. One standard meal named 1Meal was defined. A variety of foods with varying Meal Cylinder fullness level, calorie cylinder fullness level, and nutrient cylinder fullness level can be manufactured to meet the different purposes for increasing, decreasing or maintaining an individual's body weight. The compositions and method of new gelatinization to increase the volume of the existing food to gain significant effect of satiation and satiety for weight control were also provided. The user can easily and joyfully consume these desired foods with high nutrients but low calorie to manage body weight without hunger. The new gelatinized foods have the characters that almost all water can be in the non-free-flow status, such as gelatinized soups or gelatinized nutritional beverages. The gelatinized foods offer longer effect of fullness compared to the previous liquid foods. Obesity can be eradicated when these desired foods with a bigger volume and Meal Cylinder are commonly used. Th
