Diet Fat Loss Plans

I know dried blood worms and baby brine shrimp are good, but if you are unable to get your hands on that at the moment, what are some other foods that guppies enjoy and are healthy, particulary foods that have greater amounts of vitamin D? Are their any households foods or vegetables that go good with a tropical fish flake diet when cut into very small peices? I just want my guppies to have a more nutritious, healthy, and exciting diet.

Thanks for all input, advice, etc.
If you’re an experienced guppy owner, please help a fellow friend out!