Factors that make a diet sustainable include nutritional balance, local sourcing, and minimal environmental impact. A sustainable diet prioritizes whole foods, such as fruits, vegetables, whole grains, and lean proteins while reducing reliance on processed foods, which often have a larger carbon footprint. Additionally, supporting local agriculture can minimize transportation emissions and promote seasonal eating. Attention to portion sizes and reducing food waste also contribute to sustainability. Ultimately, a sustainable diet should meet individual health needs while ensuring the environment is protected for future generations.