Sugar 101. Naturally occurring sugars and added sugars. There are two types of sugars in American diets: naturally occurring sugars and added sugars. Naturally occurring sugars are found naturally in foods such as fruit (fructose) and milk (lactose).
Epidermis, in zoology, protective outermost portion of the skin. There are two layers of epidermis, the living basal layer, which is next to the dermis, and the external stratum corneum, or horny layer, which is composed of dead, keratin-filled cells that have migrated outward from the basal layer. The melanocytes, responsible for skin colour, are found in the basal cells.
1 Stratum granulosum is made up of keratinocytes that have moved up from the squamous layer. As these cells move closer toward the skin's surface, they begin to flatten and stick together, eventually drying and dying out. 2  Stratum corneum is the outermost layer of the epidermis.