To manage high blood sugar levels, individuals should focus on a diet rich in whole grains, lean proteins, and healthy fats. It's crucial to limit refined carbohydrates, sugary foods, and processed snacks. Incorporating fiber from fruits, vegetables, and legumes can also aid in stabilizing blood sugar. Regular meals and snacks can prevent spikes, while portion control is essential in managing carbohydrate intake. Consistent hydration and identifying glycemic index of foods can further assist in better blood sugar regulation.