GLOSSARY

Refined Carbohydrate usually refers to sources such as refined grains or extracted sugars that have lost some original structure or components through processing. It is not one precisely uniform chemical class covering every substance given that label.

Whole grain retains bran, germ and endosperm in their original relative proportions and can be intact, cracked, rolled or milled. Wholegrain status is not the same as an unbroken appearance. Refining commonly removes bran and germ fractions, changing fibre and selected nutrients rather than merely changing the grain's colour.

Dark bread colour or 'multigrain' wording alone does not establish wholegrain content; ingredients and the wholegrain proportion matter. Finely milled wholemeal flour can behave differently from intact kernels. Wholegrain content is one quality feature, not a guarantee that every resulting product has one fixed glycaemic index.

Cooking starch with water can increase enzyme access through gelatinisation. Milling and disruption of grain structure may also alter digestion rate. Being 'complex' therefore does not guarantee slow availability, and there is no single fixed glucose response for every starchy food regardless of preparation and structure.

A carbohydrate source is assessed through fibre, food structure, accompanying nutrients, free sugars and the purpose of use. Calling its molecules simple or complex does not by itself establish a healthy or unhealthy choice. A fruit containing simple sugars and a highly refined starchy product can play very different nutritional roles.

White flour generally contains less fibre than wholemeal, yet white bread may be tolerable in a meal close to competition because of that lower fibre. This short-term use does not remove the value of whole grains in the habitual diet; portion, meal companions and timing matter.

Replacing nutrients lost during processing is a common use of the enrichment concept, as when selected B vitamins and iron are added back to white flour in some countries. This does not restore every feature of the whole grain, including its fibre and structure. The particular product label is needed to establish which nutrients were added and how much.

Fibre and plant foods contribute to overall diet quality, but choices can change temporarily around competition. An athlete prone to digestive discomfort may choose a lower-fibre meal before intense exercise and eat higher-fibre foods at another time. Adjusting timing differs from excluding a food group in the long term.