The cell wall comprises the 'dietary fibre' component. One of the ways you can check quality in a batch of apples is to carry out instrumental tests on them. The Instron Universal Testing Machine applies forces to any food product, or a sample cut from it, and provides information about its hardness and strength as indicators of texture. Apple aroma results from subtle blends of the 250 volatile esters, alcohols, aldehydes and essential oils present. Fruit colour comes from traces of chemicals such as chlorophyll, carotenoids and anthocyanins.
Apples contain dietary fibre in their skins and core.
Excluding the peel and core of apples from the diet almost halves the amounts of Vitamin C and dietary fibre available in the whole fruit, but makes very little difference to the sugar content. Washing the skin to remove any contaminants is advisable. Fruit and vegetables are an important part of a balanced diet. Health advisory organisations recommend we eat at least five portions of fruit and vegetables a day to help reduce cancer risks and improve heart health. Apples are a good 'snack' food and are easy to eat fresh.