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Focus on PHARMACOLOGY ESSENTIALS FOR HEALTH PROFESSIONALS CHAPTER 9 Nutritional Aspects of Pharmacology and Herbal Substances Organizations are Structured to Provide Safe Patient Care • Chain of Command • Interdisciplinary Team • Rules and Policies Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Nutrition • Nutrition: how the body takes in and uses food and other sources of nutrients for growth and repair of tissues • A five-part process: intake, digestion, absorption, metabolism, elimination Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Nutrients • Nutrient: element or compound from diet that supports normal metabolism, growth, reproduction, or other functions – Essential nutrient: needed by body for normal functioning – Nonessential nutrient: can be synthesized by body from other compounds; may also be derived from diet Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Seven Nutrients • • • • • • • Proteins Fatty acids (also called lipids or fats) Carbohydrates Fiber Vitamins Minerals Water Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Macronutrients • Needed by body in large amounts for energy – Carbohydrates – Fats – Proteins – Macrominerals (dietary minerals needed in high quantities: grams) – Water Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Macronutrients Are Energy • Macronutrients: interchangeable as sources of energy – Fats yield 9 kilocalories of energy per 1 g consumed (9 kcal/g) – Proteins and carbohydrates yield 4 kcal/g • Water requirements: 1 mL/kcal of energy expended or about 2,500 mL/day Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Essential Amino Acids • Components of proteins that cannot be synthesized by the body and must be provided by diet • Nine of the 20 amino acids are essential Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Essential Fatty Acids • Required in amounts equaling 6% to 10% of fat intake (5–10 g/day) • Appear to play a role in decreasing triglyceride levels and the growth rate of atherosclerotic plaque • Required for the formation of prostaglandins and thromboxanes Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Types of Fatty Acids • Saturated – Dense, heavy, and solid at room temperature – Found in dairy products and meats • Unsaturated – Usually liquid at room temperature – From vegetables and legumes: corn, soy, peanuts, safflower Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Cholesterol • A natural lipid found in cell membranes • Found in highest concentrations in animal muscles and organs • Essential for certain cell structures • Excess cholesterol can form atherosclerotic plaque, leading to cardiovascular disease Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Carbohydrates • Provide about two-thirds of daily energy needs • Aid in fat metabolism and help reserve protein for uses such as repairing and building tissues • Daily requirement 50% to 60% of total caloric intake Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Two Types of Carbohydrates • Simple sugars – Quickly absorbed – Found in fruits, some vegetables, milk, and table sugar • Complex carbohydrates – Must be processed by the body before absorption – Found in grain, fruits, and vegetables Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Storage of Carbohydrates • Glucose (a sugar) is stored in the liver and muscles as glycogen (starch). – Available to supplement dietary supplies of carbohydrates • Excess amounts of carbohydrates are stored in the body as adipose tissue (fat). Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Blood Glucose Levels • The central nervous system (CNS) requires a constant supply of glucose to function properly. • Sustained low blood glucose levels, which can be caused by an excessively low intake of carbohydrates, can result in brain damage and death. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Lactose Sensitivity • Lactose is a sugar in human and animal milk that must be broken down by the enzyme lactase to be digested. • Many infants and children have trouble digesting foods that contain lactose. • Lactose-free milk can be substituted. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Fiber: A Complex Carbohydrate • Soluble fiber: absorbs water and swells when eaten; found in oats, fruits, and vegetables • Insoluble fiber: not absorbed by body; found in bran of whole wheat and brown rice • Provides stool bulk, which stimulates peristalsis Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Micronutrients • Vitamins and essential trace nutrients needed in very small quantities. • Insufficiencies cause biochemical alterations (such as changes in the structure and function of tissues and organs) and diseases. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamins • Organic compounds needed for normal human growth, development, and maintenance of normal body function. • Classified by solubility – Water soluble: B and C vitamins – Fat soluble: A, D, E, and K vitamins Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-1 Water-Soluble Vitamins Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-1 (continued) Water-Soluble Vitamins Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-1 (continued) Water-Soluble Vitamins Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-1 (continued) Water-Soluble Vitamins Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Thiamine (B1) • Sources: whole grains (especially wheat germ), lean meats, fish, soybeans, and other beans • Important in carbohydrate metabolic processes • Deficiency leads to beri-beri (edema, cardiovascular abnormalities, and neurologic symptoms). Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Riboflavin (B2) • Sources: dairy, yeast, and liver • Important in metabolism of fats, carbohydrates, and proteins • Deficiency causes cheilosis, stomatitis, glossitis, and seborrheic dermatitis. • No danger of excessive consumption Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Nicotinamide (B3) • Also called niacin • Sources: liver, yeast products, peanuts, whole grain cereals, and fish • Large doses lower cholesterol, triglycerides, free fatty acids • Deficiency causes pellagra (dementia, dermatitis, diarrhea, and death). Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Nicotinamide (B3) • Toxicity includes hepatic impairment, severe hypotension, and various skin conditions. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Pharmacologic Doses of Niacin • At high doses, niacin decreases blood levels of low-density lipoprotein (LDL) cholesterol and triglyceride levels, which are linked to cardiovascular disease, and increases high-density lipoprotein levels (good cholesterol). • Niacin is used under physician's supervision for this purpose. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Pantothenic Acid (B5) • Sources: whole grain cereals, legumes, meat, eggs • Needed for formation of coenzyme A • Deficiency is rare Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Pyridoxine (B6) • Sources: animal and plant products • Used to prevent neuritis in patients on isoniazid (INH) therapy and to treat hyperemesis gravidarum (nausea during pregnancy) • Deficiency is rare Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Biotin • Sources: widely available in foods and made by natural flora in intestines • Deficiency is almost unknown • No known toxicities Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Folate • Sources: dark green, leafy vegetables • Aids creation of DNA; essential to hemoglobin formation and amino acid synthesis • Deficiency causes anemia • Increased folic acid recommended in pregnancy to prevent spina bifida. • No known toxicity Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Cobalamin (B12) • Sources: fish, dairy, organ meats, eggs • Promotes normal cell function, especially blood formation and nerve cell function Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini B Vitamins: Cobalamin (B12) • Lack of intrinsic factor in GI tract (caused by certain GI disorders) can block absorption of B12, leading to pernicious anemia – More common in elderly patients • No known toxicity Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin B Factors (Choline) • Sources: milk, eggs, liver, and peanuts • Needed to produce acetylcholine (neurotransmitter involved in memory and muscle control) • Deficiency linked to Huntington’s chorea, Parkinson’s disease, and Alzheimer’s disease Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin B Factors (Choline) • Excess doses may lower blood pressure; cause fishy body odor, sweating, and excessive salivation; and reduce growth rate. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin C: Ascorbic Acid • Sources: capsicums, guavas, kiwi, citrus • Aids wound healing, tissue repair, infection resistance, iron bioavailability, and calcium absorption Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin C: Ascorbic Acid • Antioxidant role: may reduce cancer risk and lower cholesterol levels • Deficiency causes scurvy • Excess may cause diarrhea and gastritis. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin C and Cataracts • Vitamin C may protect against cataracts because the body concentrates it in the lenses of the eye. • The use of vitamin C for 10 or more years is associated with 77 to 83% lower prevalence of early to moderate cataracts. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Fat-Soluble Vitamins • • • • • • Vitamin Vitamin Vitamin Vitamin Vitamin Vitamin A (retinol) D3 (cholecalciferol) D2 (ergocalciferol) E (alpha tocopherol) K1 (phylloquinone) K2 (menaquinone) Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Retinol (Vitamin A) • Sources: fish-liver oils, butter, egg yolk, liver – All milk is fortified with vitamin A – Carotene is converted to vitamin A in body • Aids tissue maintenance, skeletal and soft-tissue growth, protein synthesis, vision Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Retinol (Vitamin A) • Mild deficiency may cause night blindness • Toxicity (hypervitaminosis A) marked by hair loss, jaundice, joint pain, liver injury, ascites Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin A Deficiency • Dietary vitamin A deficiency is the number one cause of blindness in children worldwide. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Overconsumption of Vitamins or Minerals • If overconsumption of vitamin or mineral occurs, patients should cut back, but not stop immediately, to allow the body to adjust. • Stopping immediately can trigger a deficiency. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Cholecalciferol (Vitamin D3) • Sources: yeast, fish-liver oils • Cholecalciferol (vitamin D3), made by the body in response to UV light; then activated by cholesterol to become calcitriol. • Stimulates calcium and phosphorus absorption Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Cholecalciferol (Vitamin D3) • Deficiency causes rickets, osteomalacia, osteoporosis. • Toxicity can occur, especially in children. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Tocopherol (Vitamin E) • Sources: vegetable oils, nuts, fortified cereals • Protects breakdown of red blood cells (RBCs) • Deficiency can occur in premature infants who miss final 1-2 months of gestation. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Tocopherol (Vitamin E) • Deficiency in adults disrupts myelin production, affecting physical activity and vision. • Excess intake may interfere with vitamin K and blood clotting. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin K • Phylloquinone (K1) is dietary form; menaquinone (K2) is synthesized by intestinal bacteria. • Sources: green leafy vegetables • Aids blood clotting and bone development • Antidote for overdose of anticoagulants • Deficiency is rare. • No known toxicity Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Vitamin K • Phylloquinone is routinely given to newborns to prevent hemorrhage when the umbilical cord is cut. • Trade names of this “vitamin K shot” are AquaMephyton, Mephyton, or Phytonadione. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Mineral and Vitamin Interactions • Insufficient vitamin D intake hinders the uptake of calcium. • High amounts of supplemental vitamin C reduce copper levels. • Vitamin C can increase iron absorption as much as 30%. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Mineral and Vitamin Interactions • Excessive amounts of vitamin E interfere with iron absorption. • Vitamin B6 is required to metabolize magnesium and zinc. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Proper Dosage of Vitamins • Advise patients about the proper dose of vitamins that are needed to maintain metabolic control and prevent disease.a • Warn patients that certain health problems are related to inadequate or excessive intake. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Minerals • Major: daily requirements more than 100 mg/day – Calcium, phosphorus, sodium, potassium, magnesium, and chlorine • Minor (essential trade minerals): daily requirements less than 100 mg/day – Iron, iodine, fluoride, zinc, chromium, selenium, manganese, molybdenum, and copper Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Calcium • Sources: milk, cheese, salmon, green leafy vegetables, whole grains • Aids bone formation, nerve conduction, myocardial and skeletal muscle contractions • Absorption dependent on vitamin D. • Deficiency causes rickets, osteomalacia, osteoporosis. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Calcium • Excess may cause constipation, nausea, hypotension, vomiting, kidney stones, cardiac arrhythmias. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Phosphorus • Sources: milk, cheese, legumes, beef, fish, pork • Needed for bone and tooth formation, energy, storage of fats, metabolism of other nutrients • Deficiency can cause anemia, bone brittleness, confusion, and weakness. • Toxicity may cause hypocalcemia and kidney stones. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Sodium • Source: table salt • Needed for body fluid balance and acidbase balance; regulates nerve transmission and cell membrane irritability. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Sodium • Deficiency may cause headache, confusion, nausea, weakness, anxiety, muscle spasms, hypotension. • Toxicity produces hypertension and edema. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Potassium • Sources: oranges, bananas, red meats, vegetables, yams, milk products, coffee • Helps maintain normal cardiac and muscle function • Deficiency can cause weakness, paralysis, cardiac arrhythmias, digitalis toxicity. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Potassium • Excessive intake may produce muscle weakness, diarrhea, severe dehydration, abdominal pain, hypotension, cardiac arrest. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Magnesium • Magnesium is required to form proteins. • It stimulates muscle contraction and nerve transmission, activates enzymes, and aids in bone formation. • Sources: green leafy vegetables, whole grains, and legumes • Excess or deficit may cause tetany, convulsions, or muscle spasms. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Chlorine • Sources: table salt, meat, milk, processed foods • Major electrolyte that aids acid–base balance and fluid balance • Deficiency is rare. • No known toxicity Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Essential Trace Minerals • Essential trace minerals are also called microminerals. • Less than 100 mg per day are required • They include: iron, iodine, fluoride, zinc, chromium, selenium, manganese, molybdenum, and copper. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Iron • Sources: meat, eggs, vegetables, cereals • Aids in synthesis of hemoglobin and general metabolism • Deficiency causes anemia. • Toxicity can be fatal. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Iron Toxicity • In the United States, iron overdose from supplements is leading cause of poisoning in young children. • Symptoms: nausea, vomiting, diarrhea • If not treated immediately, can result in brain, kidney, liver, and heart damage Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Iodine • Sources: iodized table salt, seafood • Helps synthesize thyroxine to control body’s basal metabolic rate • Deficiency can cause goiter, cretinism, and myxedema. • Excess intake causes acne-like skin lesions or worsen acne. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Cretinism • Cretinism occurs in children born to mothers who had limited iodine intake during adolescence and pregnancy. • Children with cretinism have retarded physical and mental development. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Zinc • Source: meat • Important during growth periods • Deficiency may cause retarded physical growth (such as dwarfism) and retarded sexual maturation, poor wound healing, hair loss, diarrhea, skin irritation. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Zinc • Excess intake can inhibit copper absorption or cause nausea, vomiting, and decreased immune function. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Fluoride • Sources: fish, tea • Prevents dental caries by strengthening tooth's ability to withstand bacterial erosion Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Copper • Sources: organ meats (liver), seafood, nuts, seeds, legumes, grains • Aid energy production and hemoglobin synthesis • Deficiency is rare; increased intake is recommended for pregnant or lactating women to meet increased needs. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Copper • Toxicity: Wilson’s disease is genetic disorder causing excess storage of copper in body that can result in liver and nerve damage. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Nutritional Requirements • Nutritional needs of infants in 1st year of life are increased. • Breast milk and commercially prepared formula contain the correct balance of nutrients. • Cow’s milk does not meet these standards. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Nutritional Requirements • Food and Nutrition Board issues recommended dietary allowances (RDAs) every 5 years. • Body composition requires balancing energy intake with energy expenditure. • Nutrition during pregnancy: 25–30 pound weight gain recommended. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Cachexia • A profound syndrome caused by malnutrition and a disturbance in glucose and fat metabolism. • Occurs in patients with terminal cancer or AIDS and in patients who are in generally poor health Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Nutritional Support • Enteral nutrition: used in patients with a functioning GI tract to supplement or completely replace oral feeding; administered through a tube • Parenteral nutrition: indicated for patients who require intensive protein and caloric support and who are unable or unwilling to take oral supplementation; administered IV Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Nutrient–Drug Interactions • Food affects drug absorption by slowing gastric emptying, by binding with a drug, decreasing the access of drugs to sites of absorption, altering the dissolution rate of drugs, or altering the pH of the GI contents. • Drugs can affect mineral or vitamin metabolism or absorption, and also suppress appetite. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-2 Drugs That Affect Appetite, Absorption, and Tissue Metabolism Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Food Additives and Contaminants • Benefits of additives – Facilitate food processing and preservation – Enhance restorative or stimulating properties of foods – Control natural contaminants • Additives are strictly regulated. • Reported health problems related to additives have been trivial and largely anecdotal Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Herbal Supplements • An herbal supplement may be defined as any mixture of ingredients based on plant sources and designed for the improvement of health or treatment of certain conditions. • They are considered by the FDA to be food products, and not drugs. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Use of Herbal Supplements • Patients must understand that the taking of herbal supplements should not occur without consulting their physician. • These substances are not regulated by the FDA and there is no verification of their quality, effectiveness, or quantity of ingredients they contain. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Complementary and Alternative Medicine (CAM) • CAM involves different healing systems and therapies, which include: – Herbal therapies – Nutritional supplements – Special diets Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini The Dietary Supplement Health and Education Act • DSHEA (1994) attempted to regulate herbal supplements. • This act requires manufacturers to label these products as dietary supplements. • Dietary supplements are defined as products that are intended to enhance or supplement the diet. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini The Dietary Supplement and Nonprescription Drug Consumer Protection Act • This 2007 act required that manufacturers must include contact information on product labels for consumers so that they can report adverse effects of products. • Manufacturers must inform the FDA of such occurrences within 15 days after receiving a consumer complaint. Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-3 Top-Selling Herbal Supplements Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-3 (continued) Top-Selling Herbal Supplements Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-3 (continued) Top-Selling Herbal Supplements Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini Table 9-3 (continued) Top-Selling Herbal Supplements Focus on Pharmacology: Essentials for Health Professionals, Second Edition Jahangir Moini