Fats, Vitamins, and Minerals Lecture Flashcards

Energy Density of Fat: * Fat provides $9\,kcal/g$ of energy. * Calculation Example: The number of kilocalories provided by $23\,g$ of fat is calculated as $23\,g \times 9\,kcal/g = 207\,kcal$ .
Body Storage of Excess Energy: * Any extra energy consumed from foods (such as large quantities of tuna, chicken, and lean meats) that the body does not immediately need will be stored as adipose tissue. * This applies even to lean protein sources if the total caloric intake exceeds energy expenditure.

Triglycerides: * A major physiologic function of triglycerides is serving as stored energy for the body.
Phospholipids: * Phospholipids are critical biological components because they form the structural basis of cell membranes.
Cholesterol (Sterols): * Classification: Cholesterol is classified as a sterol. * Dietary Sources: Dietary cholesterol is found exclusively in animal-derived foods. * Synthesis: The liver is the primary organ responsible for synthesizing cholesterol in the human body.

Essential Fatty Acid (EFA) Deficiency: * Symptoms: Clinical symptoms associated with a deficiency in essential fatty acids include skin lesions and scaliness. * At-Risk Populations: Patients with fat malabsorption are at a significantly higher risk for developing essential fatty acid deficiency compared to healthy adults or athletes.
Monounsaturated Fats: * These fats are primarily found in plant sources such as olive oil and avocados.
Omega-3 Fatty Acids: * Sources: Commonly found in fish and fish oils. * Dietary Choices: A grilled tuna sandwich is an ideal lunch choice for increasing omega-3 intake, whereas peanut butter, lentil soup, or olive oil do not provide as high a concentration of omega-3s.

Mechanical and Chemical Digestion: * While some minor digestion occurs in the mouth and stomach, the majority of chemical fat digestion occurs in the small intestine.
Acceptable Macronutrient Distribution Range (AMDR): * The recommended range for fat intake is $20\text{--}30\%$ of total daily calories.
Calculations for Daily Intake (Example: $3000\,kcal$ Diet): * Step 1: Calculate caloric range from fat: $0.20 \times 3000\,kcal = 600\,kcal$ and $0.30 \times 3000\,kcal = 900\,kcal$ . * Step 2: Convert calories to grams using the $9\,kcal/g$ factor: $600 \div 9 = 66.67\,g$ and $900 \div 9 = 100\,g$ . * Note: Consistent with classroom activities, a healthy range for this caloric intake is approximately $67\,g$ to $117\,g$ (where $117\,g$ represents a higher upper threshold used in specific clinical contexts).

Lipoproteins: * LDL (Low-Density Lipoprotein): Known as "bad cholesterol" because it is associated with increased plaque formation. * HDL (High-Density Lipoprotein): High levels of HDL are beneficial as they decrease the risk of heart disease.
Disease Prevention and Management: * Dietary fat intake is directly related to an increased risk of coronary vascular disease. * Food Labeling: For individuals with coronary heart disease, the most helpful information on a food label is the grams of saturated fat per serving. * Dietary Modifications: To decrease cardiovascular disease risk, it is recommended to replace high-fat processed meats like salami with leaner options such as turkey.

Classification of Fat-Soluble Vitamins: * The fat-soluble vitamins are Vitamins A, D, E, and K.
Vitamin A: * Essential for maintain vision and immune system health.
Vitamin D: * Functions: Primary roles include bone health and facilitating calcium absorption. * Synthesis: Synthesized by the body when the skin is exposed to sunlight. * Deficiency: Deficiency in children can lead to rickets.
Vitamin C: * Functions: Crucial for collagen formation and wound healing. * Requirements: The recommended daily intake for adult men is $90\,mg$ .
Vitamin K: * Functions: Essential for blood clotting. * Sources: Main dietary sources are dark green leafy vegetables (e.g., stir-fried beef with broccoli is a high-source meal due to the broccoli).
Vitamin E: * Provides antioxidant protection for the body.
B Vitamins: * Vitamin B6: Crucial for the synthesis of neurotransmitters and red blood cells. * Folic Acid (Folate): Vital for women planning for pregnancy to ensure healthy fetal development.

Iron: * Function: Essential for oxygen transport in the blood. * Deficiency: Deficiency can lead to anemia. * Requirements: The recommended daily intake for adult women aged 19-50 is $18\,mg$ .
Calcium: * Function: Primary function is ensuring bone and teeth health. * Requirements: The recommended daily intake for adults aged 19-50 is $1000\,mg$ .
Iodine: Necessary for the production of thyroid hormones.
Potassium: Important for maintaining fluid balance and muscle function.
Sodium: Central to maintaining fluid balance and nerve function.
Magnesium: Required for muscle and nerve function.
Zinc: Necessary for immune function and wound healing.
Fluid Intake and Dehydration: * Optimal Intake Example: Consuming a cup of decaf coffee, a cup of fruit juice, 6 cups of water, and a cup of tea daily is considered an optimal fluid intake level. * Dehydration Impacts: Dehydration is most likely to have a negative effect on body temperature regulation.