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Chapter 10

Ch. 10 Summary

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University of Guelph
NUTR 1010

Chapter 10- Nutrients Involved in Energy Metabolism and Blood Health Our bodies require vitamins and minerals to produce energy -Although vitamins and minerals do not directly provide energy, we are unable to generate energy from macronutrients without them. -B vitamins (or B complex vitamins) are particularly important for assisting in energy metabolism. They include; thiamin, riboflavin, vitamin 6 , niacin, folate, vitamin12 , pantothenic acid and biotin. see table 10.1 p 353 for functions, recommended intake, toxicity and deficiency symptoms and table 10.2 p 358 for common foods containing RDA or AI. -Primary role is to act as coenzymes. Activate enzymes and assist them in the metabolism of carbohydrates, fats, and amino acids; the repair and replication of DNA; cell differentiation; the formation and maintenance of the central nervous system; the formation of blood. -Acting as coenzymes, B vitamins, assist enzymes in metabolizing nutrients (such as carbohydrates, fats and proteins) to produce energy. They are commonly found in whole grains, enriched breads, enriched ready to eat cereals, meats, poultry, fish, dairy products and some fruits and vegetables. Minerals such as chromium and iodine, assist with nutrient uptake into the cells with regulating energy production and cell growth. -Deficiencies of B complex vitamins can cause beriberi (thimin), pellagra (niacin), large cell anemia and neural tube defects (folate), elevated homocysteine levels (folate and vitamin B )12pernicious anemia and nervous system damage (vitamin B ). 12 Nutrients involved in energy metabolism Choline- vitamin-like substance that assists with homocysteine metabolism. Choline also accelerates the synthesis and release of acetylcholine, a neurotransmitter that is involved in a variety of functions, such as muscle function and memory storage. Also necessary for synthesis of phospholipids and other components of cell membranes. Critical during pregnancy when it aids in production of stem cells. May play a role in neural tube defects. Plays an important role in transport and metabolism of fats and cholesterol. AI 19 older, M=550mg/day W=425 mg/day. Found in milk, liver, eggs, peanuts and legumes. Toxicity symptoms; fishy body odour, vomiting, excess salivation, sweating, diarrhea and low bp. Deficiency symptoms; increase fat accumulation in liver, eventually leads to liver damage. Iodine- Trace mineral needed to support energy regulation and for the synthesis of thyroid hormones. Thyroid hormones are integral to the regulation of body temp, maintenance of resting metabolic rate and healthy reproduction and growth. RDA 19 older=120ug/day. UL=1100ug/day. Few foods naturally contain iodine, good food sources are; saltwater fish and shrimp, iodized salt, milk and other dairy products. Toxicity blocks synthesis of thyroid hormones, thyroid works harder and may enlarge; condition known as goiter. However, goiter is also the symptom of deficiency, lack of iodine suppresses production of thyroid hormones, leading to hypothyroidism. Other symptoms of deficiency include; decreased body temp, inability to tolerate cold environment, weight gain, fatigue and sluggishness. If woman experiences iodine deficiency during pregnancy, infant is at high risk to be born with cretinism (a special form of mental retardation, results in lower than normal IQ) and is also associated with stillbirths, spontaneous abortions and neonatal deaths. Infant may suffer stunted growth, deafness and muteness. Chromium- Trace mineral that enhances the ability of insulin to transport glucose from the bloodstream into the cell. Also necessary for the metabolism of RNA and DNA, and supports normal growth and immune function. Plays an important role in carbohydrate metabolism as well. Chromium supplements are marketed to reduce body fat and enhance muscle mass and have become popular with body builders and other athletes who wish to improve body composition. AI 19-50, M=35ug/day W=25ug/day. Adults 51+, AI decreases to M=30ug/day W=20ug/day. Food sources; mushrooms, prunes, dark chocolate, nuts, whole grains, cereals, asparagus, brewer’s yeast, some beers and red wine. No toxicity related. Deficiency is uncommon in North America, however it inhibits the uptake of glucose by the cells, causing rise in blood glucose and insulin levels. Can result in elevated blood lipid levels and damage to brain and nervous system. Manganese- Trace mineral that acts as a coenzyme in energy metabolism and in formation of urea. Manganese also assists in the synthesis of the protein matrix found in bone, assists in building cartilage. And is a component of the superoxide dismutase antioxidant enzyme system, thus assists in the conversion of free radicals to less damaging substances, protecting our bodies from oxidative damage. AI 19 older, M=2.3mg/day W=1.8mg/day. UL 19 older=11mg/day. Widespread in foods and requirements are easily met, some include; whole grain foods (oat bran, wheat flour, ww spaghetti, and brown rice), pineapple, pine nuts, okra, spinach, and raspberries. Toxicity can occur in occupational environments where ppl inhale manganese dust or drink water high in manganese. Results in impairment of neuromuscular system, causing symptoms similar to those of Parkinson’s disease such as muscle spasms and tremors. Deficiency is rare in humans, but symptoms include; impaired growth and reproductive function, reduced bone density and impaired skeletal growth, impaired glucose and lipid metabolism and skin rash. Sulphur- Major mineral that is a component of the B-complex vitamins thiamin and biotin. Also a part of the amino acids methionine and cysteine. Helps stabilize the 3-dimentional shapes of proteins and help the liver detoxify alcohol and carious drugs. Liver requires sulphur to assist in detoxification of alcohol and carious drugs and assists us on marinating acid-base balance. We are able to synthesize ample sulphur from the protein-containing foods we eat; therefore we do not need to consume sulphur in the diet, and there is not DRI for sulphur. There are no known toxicity or deficiency symptoms. What is the role of blood in maintaining health? -Blood is the only fluid tissue in our bodies. It has 4 components: erythrocytes (red blood cells that transport oxygen), leukocytes (white blood cells, protect us from infection and illness), platelets (cell fragments that assist in formation of blood clots and help stop bleeding), and plasma (fluid portion of blood, needed to maintain blood volume so blood can flow easily). -blood is critical to maintaining life, as it transports oxygen and nutrients to our cells and removes waste products from cells so they can be excreted. Without healthy blood, we could not survive. Nutrients that maintain healthy blood- nutrients recognized as playing a critical role in maintaining blood health include vitamin K, iron, zinc and copper. Summary of functions, requirements (RDA and AI), toxicity and deficiency symptoms provided in Table 10.3 p 363. Vitamin K- Fat-soluble vitamin that acts as a coenzyme assisting in the coagulation of blood (clotting). Also a coenzyme in the synthesis of proteins that assist in maintaining bone de
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