The Blonde Butter Maker talks about this.

Grow your own gardens like we do. Join in the action. Pick the strawberries. Making the jam yourself allows you to determine which ingredients are not included and more importantly the quality of those ingredients. Most often, we get our foods from larger farms as opposed to local farms which means depleted soil, GMO, sprays, chemicals, put in the air, the water, the soil, into the DNA of the food, plants, animals. I'm Oatmeal.

Vitamins are taken out of the foods.