We spent some time last year and got some tomatoes, peppers and cucumbers. The blueberries and watermelons didn't do anything. We also had a pot for herbs. It was nice to be able to run out and get some food in the garden.
Dietwise, I'm not organized enough to grow my own veggies but, last August, my cholesterol went up a tick, the bad was 110 and the doc said "w/ T1, you should be under 100, you're close but if it goes up more, we should look into some meds..." so I switched out a few carbs (pretzels...) for snacks, not a lot but maybe 1/2 serving/ day, with carrots and broccoli and then switched my eggs from ham & cheese to spinich and broccoli and chia seeds (having read "Born to Run", about the Tarahumara runners in Mexico...). A couple weeks later, I had my best running week ever, PR 1/2 on Sunday and good 20 miles at a 9:45 pace the following Saturday and felt REALLY good, not a lot of ugly recovery struggles. I've stuck to the veggies since then and my next Cholesterol the bad one was back down in the 80s