BackBIO 155 Nutrition Study Guide – Step-by-Step Guidance
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Q1. Explain the health consequences of consuming too little or too much protein.
Background
Topic: Protein Intake and Health
This question tests your understanding of the effects of both protein deficiency and excess on human health, including specific conditions and risks.
Key Terms:
Protein-energy malnutrition (PEM): A condition resulting from inadequate protein and calorie intake.
Kwashiorkor and Marasmus: Two forms of severe PEM.
Kidney stones, osteoporosis, cancer: Potential risks of excessive protein intake.
Step-by-Step Guidance
Start by describing what happens in the body when protein intake is too low. Consider the role of protein in maintaining lean body mass and supporting bodily functions.
Identify the specific health conditions associated with protein deficiency, such as kwashiorkor and marasmus, and explain their main features.
Discuss the consequences of excessive protein intake, including how it might displace other important nutrients in the diet.
List the health risks linked to high protein consumption, such as increased risk of kidney stones, osteoporosis, and certain cancers.
Summarize why a balanced protein intake is important for overall health, stopping before listing all the specific symptoms or outcomes.
Try solving on your own before revealing the answer!
Final Answer:
Consuming too little protein can lead to protein-energy malnutrition, which includes conditions like kwashiorkor (characterized by edema and fatty liver) and marasmus (severe wasting and muscle loss). This can result in loss of lean body mass, weakened immune function, and deficiencies in vitamins and minerals. In older adults, insufficient protein increases the risk of muscle loss and frailty.
Eating too much protein can displace other nutrient-rich foods, leading to lower intake of fiber, vitamins, and minerals. High-protein diets are associated with increased risk of kidney stones, osteoporosis (due to increased calcium excretion), and possibly some cancers. Balance is key for optimal health.
Q2. What are the different types of vegetarians?
Background
Topic: Vegetarian Diets
This question tests your knowledge of the various classifications of vegetarian diets and what foods are included or excluded in each.
Key Terms:
Semi-vegetarian: Excludes meat, fish, and poultry but includes dairy and eggs.
Pescetarian: Includes fish but excludes meat and poultry.
Lacto-ovo-vegetarian: Includes dairy and eggs, excludes meat, fish, and poultry.
Lacto-vegetarian: Includes dairy, excludes eggs, meat, fish, and poultry.
Ovo-vegetarian: Includes eggs, excludes dairy, meat, fish, and poultry.
Vegan: Excludes all animal products.
Step-by-Step Guidance
List the main types of vegetarian diets you are aware of.
For each type, specify which animal products (meat, fish, poultry, dairy, eggs) are included or excluded.
Note any overlap or differences between similar types (e.g., lacto-ovo vs. lacto-vegetarian).
Stop before providing the full list or detailed definitions for each type.
Try solving on your own before revealing the answer!
Final Answer:
The main types of vegetarians are:
Semi-vegetarian: Eats plant foods, dairy, and eggs, but avoids meat, fish, and poultry.
Pescetarian: Similar to semi-vegetarian but includes fish.
Lacto-ovo-vegetarian: Eats dairy and eggs, but not meat, fish, or poultry.
Lacto-vegetarian: Eats dairy but not eggs, meat, fish, or poultry.
Ovo-vegetarian: Eats eggs but not dairy, meat, fish, or poultry.
Vegan: Excludes all animal-derived foods.
Q3. Describe the benefits and risks of a vegetarian diet.
Background
Topic: Vegetarian Diets – Health Impacts
This question asks you to evaluate both the positive and negative health effects of following a vegetarian diet.
Key Terms:
Saturated fat, cholesterol: Often lower in vegetarian diets.
Fiber, vitamins, minerals: Often higher in plant-based diets.
Protein, vitamin B12, iron: Nutrients that may be lacking if not carefully planned.
Step-by-Step Guidance
Identify the main health benefits associated with vegetarian diets, such as reduced risk of chronic diseases.
List the nutrients that are typically abundant in vegetarian diets (e.g., fiber, certain vitamins).
Discuss potential risks or deficiencies that vegetarians may face if their diet is not well planned.
Consider how vegetarians can address these risks through food choices or supplementation, but stop before listing all specific strategies.
Try solving on your own before revealing the answer!
Final Answer:
Benefits of a vegetarian diet include lower intake of saturated fat and cholesterol, higher intake of fiber, vitamins, and minerals, and reduced risk of heart disease, high blood pressure, type 2 diabetes, obesity, and some cancers. Risks include potential deficiencies in protein, vitamin B12, iron, and other nutrients found mainly in animal foods. Careful planning and use of fortified foods or supplements can help vegetarians meet their nutritional needs.
Q4. What are the functions, food sources, and deficiency symptoms of the following vitamins and minerals: Vitamins A, D, E, K, Folate, Vitamin C, B vitamins (B12, Thiamin, Niacin, Riboflavin), Calcium, Iron, Sodium, Potassium, Phosphorus, Magnesium, Zinc, Fluoride?
Background
Topic: Vitamins and Minerals – Functions, Sources, Deficiencies
This question tests your ability to recall and summarize the roles, dietary sources, and deficiency symptoms of key micronutrients.
Key Terms and Concepts:
Fat-soluble vitamins: A, D, E, K
Water-soluble vitamins: B vitamins, Vitamin C
Major minerals: Calcium, Sodium, Potassium, Phosphorus, Magnesium
Trace minerals: Iron, Zinc, Fluoride
Step-by-Step Guidance
For each vitamin or mineral, identify its main function(s) in the body (e.g., Vitamin A for vision, Iron for oxygen transport).
List at least one or two major food sources for each nutrient.
Describe the main deficiency symptoms or diseases associated with each nutrient (e.g., Vitamin D deficiency causes rickets).
Stop before providing a full table or exhaustive list; focus on the approach for organizing this information.
Try solving on your own before revealing the answer!
Final Answer:
Vitamin A: Function – vision, cell differentiation; Sources – liver, eggs, dairy, orange vegetables; Deficiency – night blindness, xerophthalmia.
Vitamin D: Function – bone health, calcium regulation; Sources – sunlight, fortified milk, fatty fish; Deficiency – rickets, osteomalacia.
Vitamin E: Function – antioxidant; Sources – vegetable oils, nuts, seeds; Deficiency – nerve problems, muscle weakness.
Vitamin K: Function – blood clotting; Sources – green leafy vegetables; Deficiency – rare, but can cause bleeding.
Folate: Function – DNA synthesis; Sources – leafy greens, legumes, enriched grains; Deficiency – megaloblastic anemia.
Vitamin C: Function – collagen synthesis, antioxidant; Sources – citrus fruits, peppers, broccoli; Deficiency – scurvy.
B vitamins: Various functions in energy metabolism and red blood cell formation; Sources – whole grains, meats, dairy; Deficiencies – anemia, pellagra, beri beri, etc.
Calcium: Function – bone/teeth health, muscle contraction; Sources – dairy, leafy greens; Deficiency – osteoporosis.
Iron: Function – oxygen transport; Sources – red meat, legumes; Deficiency – anemia.
Sodium: Function – fluid balance; Sources – table salt, processed foods; Deficiency – rare.
Potassium: Function – fluid balance, nerve function; Sources – fruits, vegetables; Deficiency – muscle weakness.
Phosphorus: Function – bone health, energy metabolism; Sources – meat, dairy; Deficiency – muscle weakness.
Magnesium: Function – enzyme function, bone health; Sources – whole grains, nuts; Deficiency – muscle weakness, seizures.
Zinc: Function – enzyme function, immunity; Sources – red meat, seafood; Deficiency – impaired growth, immune dysfunction.
Fluoride: Function – dental health; Sources – fluoridated water; Deficiency – dental caries.
Q5. What is pellagra and beri beri?
Background
Topic: Vitamin Deficiency Diseases
This question tests your knowledge of specific deficiency diseases related to B vitamins.
Key Terms:
Pellagra: Niacin (Vitamin B3) deficiency
Beri beri: Thiamin (Vitamin B1) deficiency
Step-by-Step Guidance
Define pellagra and identify the vitamin deficiency that causes it.
List the main symptoms of pellagra (hint: the "three D's").
Define beri beri and identify the vitamin deficiency that causes it.
Differentiate between wet and dry beri beri, but stop before listing all symptoms.
Try solving on your own before revealing the answer!
Final Answer:
Pellagra is caused by a deficiency of niacin (Vitamin B3) and is characterized by dermatitis, dementia, and diarrhea.
Beri beri is caused by a deficiency of thiamin (Vitamin B1). Wet beri beri affects the cardiovascular system (causing swelling and shortness of breath), while dry beri beri affects the nervous system (causing numbness, confusion, and difficulty walking).
Q6. What are electrolytes? What minerals are classified as electrolytes?
Background
Topic: Electrolytes and Fluid Balance
This question tests your understanding of the role of electrolytes in the body and which minerals are considered electrolytes.
Key Terms:
Electrolytes: Minerals that carry an electric charge and help regulate fluid balance.
Fluid balance: The maintenance of the proper amount and distribution of fluids in the body.
Step-by-Step Guidance
Define what an electrolyte is and its general function in the body.
List the main minerals that function as electrolytes.
Briefly mention how electrolytes influence water movement in and out of cells, but stop before listing all their physiological roles.
Try solving on your own before revealing the answer!
Final Answer:
Electrolytes are minerals that carry an electric charge and are essential for fluid balance, nerve transmission, and muscle function. The main electrolytes in the body are sodium, potassium, chloride, calcium, magnesium, and phosphate.
Q7. Which vitamins and minerals act as antioxidants?
Background
Topic: Antioxidants in Nutrition
This question tests your knowledge of which nutrients help protect the body from oxidative damage.
Key Terms:
Antioxidant: A substance that prevents or slows damage to cells caused by free radicals.
Free radicals: Unstable molecules that can damage cells.
Step-by-Step Guidance
Define what an antioxidant is and why it is important for health.
List the main vitamins and minerals that function as antioxidants.
Stop before explaining the specific roles of each antioxidant nutrient.
Try solving on your own before revealing the answer!
Final Answer:
The main antioxidant vitamins are A, C, and E, as well as beta-carotene. The mineral selenium and certain phytochemicals also act as antioxidants.
Q8. What is the best way to store and prepare food so that you maintain vitamin and mineral bioavailability?
Background
Topic: Food Preparation and Nutrient Retention
This question tests your understanding of how cooking and storage methods affect the nutrient content of foods.
Key Terms:
Bioavailability: The proportion of a nutrient that is absorbed and utilized by the body.
Water-soluble vitamins: More sensitive to heat, air, and water.
Fat-soluble vitamins: More stable, but still can be lost during cooking.
Step-by-Step Guidance
Identify which vitamins are most sensitive to loss during cooking and storage (e.g., water-soluble vitamins).
List general strategies to minimize nutrient loss, such as reducing exposure to air, water, and heat.
Suggest cooking methods that help preserve vitamins and minerals, but stop before listing all specific techniques.
Try solving on your own before revealing the answer!
Final Answer:
To maintain vitamin and mineral bioavailability, minimize exposure to air, water, and heat. Use as little water as possible when cooking, reduce cooking time, and keep foods cool. Store produce properly and avoid overcooking to preserve nutrients.
Q9. What are phytochemicals? What are their functions and sources?
Background
Topic: Phytochemicals in Nutrition
This question tests your understanding of plant-based compounds and their health benefits.
Key Terms:
Phytochemicals: Naturally occurring compounds in plants that have health benefits.
Antioxidant: Many phytochemicals act as antioxidants.
Step-by-Step Guidance
Define what phytochemicals are and their general role in the body.
List some of the main functions of phytochemicals, such as acting as antioxidants or supporting heart health.
Identify common sources of phytochemicals, focusing on colorful fruits and vegetables, but stop before listing all color categories and examples.
Try solving on your own before revealing the answer!
Final Answer:
Phytochemicals are plant compounds that give fruits and vegetables their colors and have health benefits, including acting as antioxidants and supporting heart health. They are found in a variety of plant foods, especially colorful fruits and vegetables.
Q10. What are the functions of water in the body, where is it found, and what are its sources?
Background
Topic: Water in Human Nutrition
This question tests your knowledge of the roles of water, its distribution in the body, and dietary sources.
Key Terms:
Intracellular fluid: Fluid inside cells.
Extracellular fluid: Fluid outside cells.
Solvent, transport medium: Key functions of water.
Step-by-Step Guidance
List the main functions of water in the body, such as acting as a solvent and transport medium.
Describe where water is found in the body (intracellular vs. extracellular compartments).
Identify the main dietary sources of water, but stop before listing all possible sources.
Try solving on your own before revealing the answer!
Final Answer:
Water functions as a solvent, transport medium, temperature regulator, lubricant, and cushion for joints and organs. It is found in both intracellular and extracellular fluid compartments. Main sources include beverages (water, milk, juice) and foods with high water content.
Q11. What is alcohol, what are its health impacts, serving sizes, and how is it absorbed?
Background
Topic: Alcohol in Nutrition
This question tests your understanding of what alcohol is, its effects on health, standard serving sizes, and how it is processed in the body.
Key Terms:
Ethanol: The type of alcohol found in beverages.
Alcohol dehydrogenase: The enzyme that metabolizes alcohol.
Moderate consumption: Defined serving sizes for men and women.
Step-by-Step Guidance
Define what alcohol is and the type found in beverages.
List the standard serving sizes for beer, wine, and liquor.
Describe how alcohol is absorbed and metabolized in the body, but stop before explaining all health impacts.
Try solving on your own before revealing the answer!
Final Answer:
Alcohol (ethanol) is the type of alcohol found in beverages. Standard servings are 12 oz beer, 5 oz wine, or 1.5 oz liquor. Alcohol is absorbed in the stomach and small intestine, then metabolized in the liver by alcohol dehydrogenase. Moderate consumption is up to one drink per day for women and two for men. Excessive intake can be toxic and harmful to health.
