Final answer:
Marco's doctor would recommend a dietary change focusing on reducing refined carbohydrates, increasing fiber-rich foods, and including high-protein foods as part of each meal. Losing weight and increasing physical activity are also crucial in reducing the risk of diabetes.
Step-by-step explanation:
If Marco has been informed by his doctor that he is at risk for diabetes, then it's likely that his doctor would recommend he adopt a healthy diet to reduce this risk. A central aspect of this dietary change would include reducing the intake of refined carbohydrates such as sugar and white bread, and instead increasing the consumption of fiber-rich foods like fruits, vegetables, and whole grains. Moreover, about a quarter of each meal should consist of high-protein foods, such as fish, chicken, dairy products, legumes, or nuts.
Additionally, the doctor might suggest that Marco focus on losing weight, especially around the waist, as even a modest weight loss can have a significant impact on reducing the risk of developing diabetes. Losing as little as seven percent of one's body weight can be beneficial. Lastly, Marco would be advised to increase physical activity, which works alongside diet modifications to improve overall health and blood glucose levels.