Learn: Water, Minerals, and Vitamins: Essential Nutrients for Health

What percentage of an adult's body weight is constituted by water?

About 60 percent

What are the main functions of water in the body?

Carries nutrients and waste, maintains structure of large molecules, participates in metabolic reactions, serves as a solvent, maintains blood volume, regulates body temperature, acts as a lubricant.

What is water balance?

The balance between water intake and water excretion that keeps the body's water content constant.

What condition occurs when water output exceeds water input?

Dehydration

What is water intoxication?

A rare condition in which body water content is too high.

What is hyponatremia?

A decreased concentration of sodium in the blood.

Which brain center controls water balance and thirst?

Hypothalamus

What hormone is released by the pituitary gland in response to low blood volume or concentrated salts?

Antidiuretic hormone (ADH)

What enzyme do the kidneys release in response to low blood pressure?

Renin

What hormone stimulates the reabsorption of sodium by the kidneys?

Aldosterone

What is the minimum amount of urine the body must excrete each day?

Approximately 500 mL

What are electrolytes?

Salts that dissolve in water and dissociate into charged particles called ions.

What is osmosis?

The movement of water across a membrane toward the side where the concentration of dissolved particles is greater.

What role do ions play in the body?

They help regulate acidity (pH) of fluids to maintain acid-base balance.

What are buffers?

Compounds that can reversibly combine with hydrogen ions to help keep a solution's acidity or alkalinity constant.

What is the primary role of the kidneys in maintaining acid-base balance?

They play the primary role in regulating the body's pH.

What is the average total water loss per day?

About 2½ liters

What is the main argument against the use of dietary supplements?

They may not be necessary if a balanced diet is consumed.

What is the main argument for the use of dietary supplements?

They can help fill nutritional gaps in the diet.

What is the role of the hypothalamus in hydration?

It initiates drinking behavior when the body is dehydrated.

What happens to urine concentration when a person drinks more water?

The urine becomes more dilute.

What is the significance of maintaining blood volume?

It is crucial for proper circulation and overall body function.

What are the functions of water in the body?

Carries nutrients and waste products, maintains structure of large molecules, participates in metabolic reactions, serves as a solvent, maintains blood volume, aids in temperature regulation, acts as a lubricant.

What are major minerals?

Essential mineral nutrients required in the adult diet in amounts greater than 100 mg/day.

What are trace minerals?

Essential mineral nutrients required in the adult diet in amounts less than 100 mg/day.

What is the principal electrolyte in extracellular fluid?

Sodium.

What is the role of sodium in the body?

Regulates extracellular fluid volume, maintains acid-base balance, essential for muscle contraction and nerve transmission.

What is the major negative ion of extracellular fluids?

Chloride.

What is the function of chloride in the body?

Maintains fluid, electrolyte, and acid-base balances; part of hydrochloric acid in the stomach.

What is the principal positively charged ion inside cells?

Potassium.

What is the most abundant mineral in the body?

Calcium.

What is the role of phosphorus in the body?

Second most abundant mineral; part of bones and teeth, buffers, DNA, RNA, and energy transfer.

What is magnesium's role in the body?

Critical for enzyme function, muscle function, and normal heart function.

What is sulfate needed for?

Synthesis of sulfur-containing compounds; plays a role in protein structure.

What is the role of iron in the body?

Component of hemoglobin and myoglobin; vital for oxygen transport and energy generation.

What is the function of zinc?

Activates over 2700 enzymes; important for immune function, digestion, and metabolism.

What is selenium's function?

Antioxidant; necessary for thyroid hormone function.

What is iodine's role in the body?

Integral part of thyroid hormones; regulates metabolism and growth.

What is the primary role of fluoride?

Prevention of dental caries.

What does chromium do in the body?

Participates in carbohydrate and lipid metabolism; enhances insulin activity.

What are the risks of dietary supplements?

Can cause nutrient imbalances or toxicities; foods are generally safer for nutrient absorption.

What is the recommended approach for nutrient deficiencies?

Improve food choices and dietary patterns rather than starting supplementation.

What can a potassium deficiency lead to?

Increased blood pressure, kidney stones, irregular heartbeats, muscle weakness.

What is the best source of dietary iron?

Animal protein; only 10-15% of dietary iron is absorbed.

What is the role of copper in the body?

Essential for hemoglobin formation, collagen synthesis, and iron utilization.

What is manganese's function?

Cofactor for enzymes; facilitates metabolic processes.

What are the consequences of relying on processed foods?

May lead to deficiencies in essential minerals.

What is the role of boron in the body?

Influences enzyme activity; may play a role in bone health and immune response.

What are vitamins?

Essential, non-kcaloric, organic nutrients needed in tiny amounts in the diet.

How do vitamins differ from energy nutrients?

Vitamins occur in foods in much smaller quantities and serve mostly as facilitators of body processes.

What are dietary supplements?

Products added to the diet containing vitamins, minerals, herbs, amino acids, or extracts.

What is bioavailability?

The rate and extent to which a nutrient is absorbed and used by the body.

What factors determine the bioavailability of a vitamin?

Efficiency of digestion, previous nutrient intake, other foods consumed, method of food preparation, and source of the nutrient.

What are precursors in relation to vitamins?

Compounds that can be converted into active vitamins, also known as provitamins.

Which vitamins are classified as fat-soluble?

Vitamins A, D, E, and K.

What are the main roles of Vitamin A?

Supports reproduction, vision, cell differentiation, immunity, and growth.

What deficiency symptoms are associated with Vitamin A?

Night blindness and susceptibility to infection.

What is the role of Vitamin D?

Helps regulate calcium and phosphorus in the body, supporting bone health.

What is the function of Vitamin E?

Acts as an antioxidant, protecting cells from damage.

What is the primary function of Vitamin K?

Essential for blood clotting and bone metabolism.

What are the water-soluble vitamins?

Includes the B vitamins and Vitamin C.

What is the role of Thiamin (Vitamin B1)?

Involved in energy metabolism and nerve function.

What is the significance of Folate (Vitamin B9)?

Crucial for DNA synthesis and cell division; deficiency can lead to anemia.

What are common food sources of Vitamin C?

Citrus fruits, strawberries, bell peppers, and broccoli.

What is the role of Choline?

Supports neurological development and is involved in making neurotransmitters.

What are phytochemicals?

Bioactive compounds found in plants that provide health benefits beyond basic nutrition.

What are functional foods?

Foods that provide health benefits beyond basic nutrition by altering physiological processes.

How can vitamin deficiencies affect disease resistance?

Severe deficiencies can weaken the immune system and increase susceptibility to infections.

What is the classic deficiency disease caused by lack of Vitamin C?

Scurvy.

What are the best food sources of folate?

Leafy greens, legumes, seeds, and fortified grains.

What health issues are associated with Vitamin B12 deficiency?

Can lead to anemia and neurological issues.

What are the symptoms of folate deficiency?

Anemia, fatigue, and weakness.

How does alcohol consumption affect folate levels?

Alcohol can impair absorption and increase the risk of deficiency.

What is the importance of a balanced diet in relation to vitamins?

A balanced diet ensures adequate intake of all essential vitamins for optimal health.