Frozen is close to a pause button. A quick hot-water dip before freezing costs some vitamin C and folate up front, then chemistry nearly stops: the rest holds for 8 to 12 months at −18 °C ¹. Held side by side, a vegetable frozen for months often carries more vitamin C than the same one sitting five days in your fridge ².

Canning trades vitamin C for something you don't hear about. The heat costs 30 to 50% of the vitamin C, but it breaks down cell walls and frees up pigments your gut struggles to reach. A cup of canned tomato gives two to three times more absorbable lycopene than raw ³.

The clock starts at harvest, not at the store. Across most nutrients, frozen and canned land within a quarter of fresh, with minerals and fibre untouched ⁴, and run about 20% cheaper per edible cup ⁵. And the freezer doesn't crowd out fresh: people who keep it around eat more total vegetables, more fresh ones, and score higher on diet quality ⁶.

Where this lands. The produce drawer stops going to slime, and the few hundred dollars a year you fed the bin stays with you ⁵. Over months, your cups-a-day count holds through winter instead of collapsing when November broccoli doubles in price. The payoff scales with cups eaten: each daily serving of produce tracks with about a 5% lower risk of dying, out to roughly eight servings a day ^{8 9}. Only about 9% of U.S. adults hit the vegetable target, and through winter the freezer and cupboard are how most households close the gap ¹⁰.