It is a biological myth that you can physically "shrink" the actual size of your stomach organ through dieting in just one week; the stomach is a highly elastic muscular pouch designed to expand and contract based on food intake. Once you are an adult, its physical capacity remains relatively constant unless you undergo bariatric surgery. However, you can significantly reduce abdominal bloating and the sensation of a "full" stomach within seven days. To achieve a flatter appearance and reduce the pressure on your midsection, focus on eliminating high-sodium processed foods and carbonated beverages, which cause water retention and gas. Incorporating high-fiber foods like leafy greens and berries helps move waste through the digestive tract, reducing the physical protrusion of the belly. Eating smaller, more frequent "mini-meals" instead of three large ones prevents the temporary stretching of the stomach walls, making you feel full on less food. Drinking at least 2 liters of water daily helps flush out the excess sodium that contributes to a "puffy" look. While you cannot change your organ's size in a week, these habits will help you "reset" your hunger cues and lose several pounds of water weight and bloating.