7.1

Diet

12 flashcards to master Diet

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Definition Flip

What is meant by a balanced diet?

Answer Flip

A balanced diet contains all the necessary nutrients (carbohydrates, fats, proteins, vitamins, minerals, fibre, and water) in the correct proportions to meet an individual's needs for growth, repair, and energy.

Example: athletes require more carbohydrates for energy than sedentary individuals.
Key Concept Flip

What are the principal dietary sources and importance of carbohydrates?

Answer Flip

Sources: Bread, pasta, rice, potatoes. Importance: Primary source of energy for bodily functions, such as muscle contraction during exercise or maintaining body temperature. Glucose is broken down in respiration to release energy.

Key Concept Flip

What are the principal dietary sources and importance of fats and oils?

Answer Flip

Sources: Butter, oils, nuts, fatty fish. Importance: Energy storage, insulation, and protection of organs. They also form cell membranes and are needed for hormone production, like testosterone and estrogen.

Key Concept Flip

What are the principal dietary sources and importance of proteins?

Answer Flip

Sources: Meat, fish, eggs, beans, lentils. Importance: Growth and repair of tissues, enzyme production, antibody formation.

Example: keratin is a protein forming hair and nails, and enzymes like amylase digest starch.
Key Concept Flip

What are the principal dietary sources and importance of Vitamin C?

Answer Flip

Sources: Citrus fruits, green vegetables. Importance: Formation of collagen (important for skin, tendons, and ligaments), antioxidant, and boosts the immune system. A deficiency leads to scurvy.

Key Concept Flip

What are the principal dietary sources and importance of Vitamin D?

Answer Flip

Sources: Sunlight exposure, oily fish, fortified milk. Importance: Absorption of calcium from the gut for strong bones and teeth. A deficiency leads to rickets.

Key Concept Flip

What are the principal dietary sources and importance of Calcium?

Answer Flip

Sources: Dairy products, leafy green vegetables. Importance: Formation of strong bones and teeth, blood clotting, and muscle function.

Example: calcium ions are crucial for nerve impulse transmission.
Key Concept Flip

What are the principal dietary sources and importance of Iron?

Answer Flip

Sources: Red meat, liver, green vegetables. Importance: Component of hemoglobin in red blood cells, which carries oxygen. Iron deficiency leads to anemia.

Key Concept Flip

What are the principal dietary sources and importance of Fibre (roughage)?

Answer Flip

Sources: Fruits, vegetables, whole grains. Importance: Adds bulk to the diet, aiding in peristalsis and preventing constipation. Fibre is mostly undigestible plant material.

Key Concept Flip

What are the principal dietary sources and importance of Water?

Answer Flip

Sources: Drinks, fruits, vegetables. Importance: Solvent for metabolic reactions, transport of substances, temperature regulation.

Example: water transports nutrients in blood and helps excrete waste in urine.
Definition Flip

What are the causes of scurvy?

Answer Flip

Scurvy is caused by a deficiency of Vitamin C in the diet. Without enough Vitamin C, the body cannot produce sufficient collagen, leading to weakened connective tissues.

Definition Flip

What are the causes of rickets?

Answer Flip

Rickets is caused by a deficiency of Vitamin D or calcium in the diet. Lack of Vitamin D impairs calcium absorption, resulting in soft and weak bones, especially in children. Sunlight is a source for Vitamin D production.

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6.2 Leaf structure 7.2 Digestive system

Key Questions: Diet

What is meant by a balanced diet?

A balanced diet contains all the necessary nutrients (carbohydrates, fats, proteins, vitamins, minerals, fibre, and water) in the correct proportions to meet an individual's needs for growth, repair, and energy.

Example: athletes require more carbohydrates for energy than sedentary individuals.
What are the causes of scurvy?

Scurvy is caused by a deficiency of Vitamin C in the diet. Without enough Vitamin C, the body cannot produce sufficient collagen, leading to weakened connective tissues.

What are the causes of rickets?

Rickets is caused by a deficiency of Vitamin D or calcium in the diet. Lack of Vitamin D impairs calcium absorption, resulting in soft and weak bones, especially in children. Sunlight is a source for Vitamin D production.

About Diet (7.1)

These 12 flashcards cover everything you need to know about Diet for your Cambridge IGCSE Biology (0610) exam. Each card is designed based on the official syllabus requirements.

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