Veggies, prepared without a bunch of oil, sauce, or salt, are the cornerstone of healthy eating. Ideally, like Alexon said, you'd eat fresh, raw veggies, but in the hectic lives that most twentysomethings lead that's not always a realistic expectation.
"You can use frozen fruits and vegetables as an alternative," she says. "In terms of nutrient retention, sometimes frozen can be even better than fresh because some of the vitamins can be preserved in the freezing process. Canning, however, can destroy all those nutrients due to the high heat used in the process."
Image Source: POPSUGAR Photography / Jae Payne