Nutrition 101 - Glossary - R
RDI Definition - The Reference Daily Intake (RDI) is the daily intake of a nutrient, vitamin or mineral that meets the nutrition needs of most healthy individuals and is used to determine the Daily Value (DV) of foods on food labels. Relevance - The RDI is used for the FDA-regulated nutrition facts labeling of foods, and RDI is based on the 1968 Recommended Dietary Allowances (RDA), despite the introduction of the newer Dietary Reference Intake (DRI) system.
Resveratrol Definition - Resveratrol is a polyphenol present in grapes, red wine, peanuts and certain berries. Relevance - Resveratrol became popular following study of the "French Paradox" and its presence in wine; while moderate alcohol intake is linked to decreased risk of heart disease, it is unknown whether resveratrol plays a role in this relationship.
Retinyl esters Definition - Retinyl esters are the form of vitamin A present in animal food products, or pre-formed retinol. Relevance - Retinyl esters can form limited reserves, which can then provide biologically active retinol to cells as needed.
Rhabdomyolysis Definition - Rhabdomyolysis is a harmful condition in which muscle fibers are broken down and released into the bloodstream. Relevance - Rhabdomyolysis can cause severe kidney damage and can be caused by skeletal muscle injury; dark or red urine, weakness and stiffness are some symptoms and risk factors include serious crush injuries, alcoholism, drug use, seizures and more.
Rheumatoid arthritis Definition - Rheumatoid arthritis (RA) is characterized by loss of function and stiffness in the joints, particularly those of the wrist and fingers. Relevance - Unlike osteoarthritis, RA can affect areas of the body other than joints because it is an autoimmune disease, for which the cause is unknown; RA typically begins in middle age, but it can also affect children.
Riboflavin Definition - Riboflavin, or vitamin B2, is a water-soluble vitamin that is necessary for red blood cell production and growth and is found in dairy, green leafy vegetables, eggs, legumes, nuts and lean meats. Relevance - Riboflavin is linked to claims that it can prevent cervical cancer, migraines, acne, muscle cramps, and several other conditions. Food manufacturers are required to add riboflavin to enriched bread, cereal and grain products to prevent deficiency diseases, which tend to occur with other vitamin B complex deficiencies.