1. Fruits and vegetables: Fruits and vegetables are nutritious, low-calorie, and often relatively inexpensive foods.
2. Beans and plant-based proteins: Beans and plant-based proteins are high-protein, low-fat, low-cost foods, such as tofu, soybeans, mung beans, black beans, peanuts, etc.
3. Whole wheat bread and cereals: Whole wheat bread and cereals are inexpensive and high in fiber and nutrients, like oats, barley, corn, wheat, etc.
4. Eggs: Eggs are an inexpensive, high-protein, and nutritious food.
5. Nuts and Seeds: Nuts and seeds are rich in protein, fiber, and healthy fats, such as sesame seeds, almonds, walnuts, pumpkin seeds, etc.
6. Fish and seafood: Fish and seafood are high in protein, healthy fats, and nutrients, like applet, crucian carp, salmon, shrimp, etc.