Know your farmer, know your food
…If you are buying directly from beyond organic, biointensive, biodynamic, permaculture, or other farm systems that are focused on soil health and biodiversity, and you eat your food soon after purchasing it, your food is also likely to have higher nutritional content than food from the grocery store. Additionally, when you eat local you cut the time and distance between you and your food, which often means higher vitamin content since the food is picked ripe and is less subject to the nutrient degradation that can occur over long storage periods. If you go to the trouble of getting fresh food, don’t let it sit on your counter for a week before you use it. If you can’t eat it fresh, then can or freeze your fresh food immediately after harvest.
For things you are not able to grow yourself, the next best thing is to know the farmer who does grow them. This isn’t a perfect guarantee of food safety or nutritional benefit, but if you can ask questions and see the growing conditions, then you can be a better judge of the safety and quality of your food. Keep in mind, good farms are operated by people trying to earn a living doing something that usually pays less than the US poverty rate. They don’t have big advertising budgets, so they have to work hard to keep all of their customers happy…