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NUTR111 Final Assessment Study Guide: Comprehensive Nutrition Review

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Overview of Nutrition and Health

Role of Nutrition in Health Promotion and Disease Prevention

Nutrition plays a critical role in maintaining health, preventing chronic diseases, and promoting overall well-being. Understanding the functions of nutrients and their impact on the body is essential for making informed dietary choices.

  • Health Promotion: Adequate nutrition supports growth, development, and optimal functioning of body systems.

  • Disease Prevention: Proper nutrition can reduce the risk of chronic diseases such as heart disease, diabetes, osteoporosis, and hypertension.

Dietary Reference Intakes (DRIs)

RDA, AI, and UL

The Dietary Reference Intakes (DRIs) are a set of reference values used to plan and assess nutrient intakes.

  • Recommended Dietary Allowance (RDA): The average daily intake level sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals.

  • Adequate Intake (AI): Established when evidence is insufficient to develop an RDA; set at a level assumed to ensure nutritional adequacy.

  • Tolerable Upper Intake Level (UL): The maximum daily intake unlikely to cause adverse health effects.

Example: The RDA for vitamin C for adult women is 75 mg/day, while the UL is 2,000 mg/day.

Body Mass Index (BMI) and Weight Classification

BMI Categories

BMI is a measure used to classify individuals based on body weight relative to height.

  • Formula:

BMI (kg/m2)

Classification

< 18.5

Underweight

18.5 – 24.9

Normal weight

25.0 – 29.9

Overweight

≥ 30.0

Obesity

Cardiovascular Health

Heart Disease

  • Risks: High blood pressure, high cholesterol, smoking, obesity, physical inactivity, poor diet, and family history.

  • Treatment Recommendations: Adopt a heart-healthy diet, increase physical activity, manage weight, and control blood pressure and cholesterol.

  • Heart-Healthy Diet: Emphasize fruits, vegetables, whole grains, lean proteins, and healthy fats (e.g., olive oil, nuts). Limit saturated fats, trans fats, sodium, and added sugars.

Hypertension

  • Definition: Hypertension is persistently elevated blood pressure, increasing the risk of heart disease and stroke.

  • Treatment Recommendations: Reduce sodium intake, increase potassium-rich foods, maintain a healthy weight, exercise regularly, and limit alcohol.

Diabetes Mellitus

Definition and Management

  • Definition: Diabetes is a group of diseases characterized by high blood glucose levels due to defects in insulin production, action, or both.

  • Treatment Recommendations: Balanced diet with controlled carbohydrate intake, regular physical activity, weight management, and medication as prescribed.

Bone Health

Osteopenia vs. Osteoporosis

  • Osteopenia: Lower than normal bone mineral density, but not low enough to be classified as osteoporosis.

  • Osteoporosis: A condition characterized by weak and brittle bones, increasing fracture risk.

  • Risk Reduction: Adequate intake of calcium and vitamin D, regular weight-bearing exercise, avoiding smoking and excessive alcohol.

  • At-Risk Groups: Postmenopausal women, older adults, individuals with low body weight, and those with a family history.

Dietary Fiber

Recommendations and Importance

  • Recommendations: 25–38 grams per day for adults, depending on age and sex.

  • Importance: Promotes digestive health, helps regulate blood glucose, lowers cholesterol, and supports healthy weight.

Proteins

Functions, Excess, Deficiency, and Sources

  • Functions: Proteins are essential for tissue growth and repair, enzyme and hormone production, immune function, and maintaining fluid balance.

  • Excess Intake: Protein consumed above caloric needs is converted to energy or stored as fat.

  • Deficiency: Lack of essential amino acids impairs protein synthesis, leading to muscle wasting, weakened immunity, and other health issues.

  • High-Protein Foods: Meat, poultry, fish, eggs, dairy, legumes, nuts, and seeds.

Micronutrients

Key Vitamins and Minerals

  • Vitamin A: Vision, immune function, reproduction. Sources: Carrots, sweet potatoes, spinach.

  • B Vitamins: Energy metabolism, red blood cell formation. Sources: Whole grains, meat, legumes.

  • Vitamin C: Antioxidant, collagen synthesis, immune support. Sources: Citrus fruits, strawberries, bell peppers.

  • Vitamin D: Calcium absorption, bone health. Sources (non-milk): Fatty fish, fortified cereals, sunlight exposure.

  • Vitamin E: Antioxidant, protects cell membranes. Sources: Nuts, seeds, vegetable oils.

  • Iron: Oxygen transport, energy metabolism. Sources: Red meat (heme), beans (non-heme).

  • Potassium: Fluid balance, nerve transmission, muscle function. Sources: Bananas, potatoes, beans.

  • Zinc: Immune function, wound healing, DNA synthesis. Sources: Meat, shellfish, legumes.

Iron Absorption

  • Heme Iron: Found in animal foods; well absorbed.

  • Non-Heme Iron: Found in plant foods; less well absorbed.

  • Enhancers: Vitamin C-rich foods increase non-heme iron absorption.

  • Inhibitors: Calcium, phytates (in grains), and polyphenols (in tea/coffee) can reduce iron absorption.

Micronutrient Deficiencies in Vegans

  • At-Risk Vitamins: Vitamin B12, vitamin D, iron, calcium, and omega-3 fatty acids.

Nutrition Across the Lifecycle

Pregnancy

  • Energy Requirements: Increase by trimester; generally, an additional 340 kcal/day in the second trimester and 450 kcal/day in the third trimester.

  • Recommended Vitamins: Folic acid (pre-pregnancy and during pregnancy), iron, and prenatal multivitamins.

Adolescence

  • Micronutrient Needs: Increased requirements for calcium, iron, and vitamin D to support rapid growth and development. Females need more iron due to menstruation.

Older Adults

  • Nutrition-Related Changes: Reduced energy needs, decreased absorption of some nutrients (e.g., vitamin B12), risk of dehydration, and changes in taste/smell.

  • Recommendations: Nutrient-dense foods, adequate hydration, and possible supplementation as needed.

Physical Activity and Nutrition

Exercise Recommendations

  • Aerobic Activity: At least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic activity per week.

  • Strength Training: Muscle-strengthening activities on 2 or more days per week.

Application: Tailor exercise and nutrition plans to individual needs and health status.

Weight Management

Is Weight Loss Always Recommended?

  • Weight loss is not always recommended for all individuals classified as overweight by BMI; recommendations should consider overall health, risk factors, and individual circumstances.

Waist Circumference

  • Measurement: Assesses abdominal fat, which is a risk factor for metabolic diseases.

  • Risk Thresholds: ≥ 40 inches (102 cm) for males and ≥ 35 inches (88 cm) for females indicate higher risk for metabolic diseases.

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