A recent Cleveland Clinic survey found almost half of Americans admitted they buy fast food at least once a week with younger generations doing it the most. And while fast food may be convenient, it's not exactly healthy. Zumpano says if you keep a busier schedule and aren't sure what to cook at home, consider buying frozen vegetables, salad kits or mixed greens. Those won't take long to make. Same with precooked meats and other side dishes, like beans, whole grain rice or noodles.