Canned salmon or tuna

Choose low-sodium versions (packed in water) when possible. It’ll cost you less than the fresh varieties but wild Alaskan canned salmon is just as good for you and both tuna and salmon boast low mercury levels. They’re also chock full of omega-3 fatty acids and loaded with protein.
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Plain pasta sauce

A great all-purpose staple for making pasta or homemade pizza. Choose a low-sodium variety. Plus, tomatoes are a proven cancer-fighting food.
Green tea

Green tea is filled with disease-fighting antioxidants. Use loose-leaf tea, which is more flavourful than bagged. Store in an opaque, dry, airtight container once opened. Use cold green tea to make a smoothie.