Blue African fruit of a plant plant Pollia condensata contains no blue pigment. The blue and its iridescent shine are caused by a Bragg reflection - intense peaks of light generated at certain wavelengths and angles - created by spirally stacked cellulose fibers that form multiple layers in the fruit's skin.
All about fruitarianism with a long-term fruitarian, Lena
Blue Iridescent Fruits without Pigment
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Now I can look at you in peace; I don't eat you any more.
Nutrient - a substance that provides essential nourishment for growth and the maintenance of life.
Foods are composed chiefly of carbohydrates, fats, proteins, water, vitamins, and minerals. Carbohydrates, fats, proteins, and water represent virtually all the weight of food. Carbohydrates, fats, and proteins comprise 90% of the dry weight of foods.