Staying Healthy in Winter

This summer I've been so enjoying the farmers' markets around and have incorporated a lot more fresh fruits and vegetables into my meals. Some evenings, especially when it's hot, I've been eating cottage cheese and peaches or some other fruit. Lunch is generally a cheese sandwich, fruit (today I have a peach, yesterday it was blueberries), and a vegetable or two. Both yesterday and today I have a green pepper and a cucumber. I don't use a microwave or stove for lunch and won't be starting. While this may seem monotonous to some, I don't worry about it because I'm fine with it. I've lost weight with very little effort.

So my question is - what happens in the winter? I can buy frozen fruit and vegetables and that's OK for meals I prepare and eat at home but how can I continue to incorporate fruit and vegetables into my room-temperature lunch? Sure, there are fruits and vegetables in the grocery stores in the winter but many of them taste like cardboard.

Any suggestions? I appreciate all of your comments.