system
Given the following post, respond as if you're commenting on Reddit:
human
[Chemistry] Are frozen vegetables any less healthy than fresh ones? Does anything happen at a molecular level when you freeze vegetables that makes them process differently in our bodies?
gpt
Well, much like cooking, freezing weakens and ruptures cell walls. Making the vegetable softer and easier to chew and to digest. Also most commercially sold frozen vegetables are briefly cooked before freezing, this improves the thawed texture. So that will also affect the  nutrition and digestibility of vegetables.

On the other hand, most frozen vegetables were  processed *very* quickly after harvest, and most 'fresh' vegetables in the store  have been sitting in storage and shipping for a while. Lettuce make take a month to reach a store shelf, depending on the time of year and how far it had to be shipped.  So all in all the most healthy choice  between fresh and frozen, would depend on the time of year and  how far that kind of vegetable had to be shipped. If the only fresh corn has to be grown over 1000 miles away and took weeks to get to you, frozen corn would probably be more nutritious.  If the fresh corn came from a field ten miles down the road,and was picked yesterday then fresh corn will be the most nutritious.