On a weight-loss diet, it's advisable to avoid foods high in added sugars, such as sugary drinks, candy, and desserts, as they provide empty calories and can lead to overeating. Highly processed foods, often rich in unhealthy fats and sodium, should also be minimized. Additionally, refined carbohydrates like white bread and pasta can spike blood sugar levels, leading to cravings. Instead, focusing on whole foods such as fruits, vegetables, lean proteins, and whole grains can support weight management and overall health, providing essential nutrients without excessive calories.