Why no natural foods that are blue?

That's not entirely true! There are actually quite a few natural foods that are blue, though they may not be as common as other colors. Here are some examples:

Fruits:

* Blueberries: The most common example, blueberries are a vibrant blue due to anthocyanins.

* Haskap Berries: Also known as honeyberries, these berries have a deep blue color and sweet, slightly tart flavor.

* Blackberries: While blackberries are often considered black, they can have a blue hue depending on the variety.

* Some grapes: Certain varieties of grapes, especially those used for winemaking, can have a blue-purple color.

Vegetables:

* Blue Corn: This corn variety is deep blue due to the presence of anthocyanin pigments. It's often used to make blue tortillas and other blue-colored foods.

* Blue Potatoes: There are a few varieties of blue potatoes, like the "Purple Majesty," which contain anthocyanins that give them their color.

* Blue-Green Algae: This type of algae, also known as spirulina, is a vibrant blue-green and is a popular ingredient in health supplements.

Other Foods:

* Blue Cheese: The blue veins in blue cheese are caused by the growth of a specific type of mold that produces a blue pigment.

* Blue Flowers: Many edible flowers like borage and cornflower are blue and can be used to garnish food or add a unique flavor.

While these examples are not as common as red, orange, or green foods, they demonstrate that blue is a color that exists naturally in the food world.

It's also important to note that the color of a food can be influenced by many factors, such as variety, growing conditions, and processing methods. So, while a particular type of fruit or vegetable might be typically blue, there might be variations in color depending on these factors.