In my opinion, healthy foods are definitely different from general foods in terms of distribution. Healthy foods? Of course being healthy means that it would be an advantage for the body to consume and digest for nutritional factors to support the body. Saying this, my explanation would be that there is a great possibility that the food is less contaminated by unwanted ingredients that the body doesn't need, for example industrial flavorings and additives. Preservatives should also not be exposed into the products to have a longer shelf-life.