Healthy pretty

Karina Giglio (2013) quoted "The skin's barrier, which is known as the acid mantle, is responsible for keeping in lipids and moisture while blocking germs, pollution, toxins, and bacteria," explains Patricia Wexler, M.D., a New York City dermatologist. "To work its best, the acid mantle should be slightly acidic, at a 5.5 pH balance. When it's too alkaline, skin becomes dry and sensitive; you may even get eczema. You may also experience inflammation, which inhibits the skin's ability to ward off matrix metalloproteinases [MMPs], the enzymes that destroy collagen and cause wrinkles and sagging."

April Long (2011) wrote somewhat paradoxically,  while an acidic pH is optimum for the epidermis, the body's internal pH should be mildly alkaline. Blood needs to maintain a narrow pH margin of between 7.35 and 7.45 for cells to function properly—including those in the dermis, or inner layer of skin, which are most robust with an alkaline pH of 7.35.

So, we need to use products that would not upset our skin pH and consume alkaline food to be healthy and look pretty.