“I recommend you add beans to your food. Rice with beans, ground meat with beans.
When I was in grad school, I made a small investment in spices and then taught myself a few Indian recipes.
Learn to prepare and freeze meals, so they are ready ahead of time, helping you avoid ordering fast food.
Use everything. Vegetable scraps can go in the freezer until you have enough to make broth
Instead of eating, you can always do a shake to fill up. Get the classic noodle meals under a dollar and look into making energy balls
Replace meat with things like chickpeas, lentils, and beans. It’s about 1/10th of the price and often the same amount of protein per meal.