Molecules of life.docx - Molecules of life Carbohydrates proteins lipids(or fats are major nutrients that we need in large quantities We get these by

Molecules of life.docx - Molecules of life Carbohydrates...

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Molecules of life Carbohydrates, proteins, lipids (or fats) are major nutrients that we need in large quantities. We get these by eating them. They are broken down first and then reassembled into our own carbohydrates, proteins and lipids. This is because: most of the molecules in food are too large to pass through the absorbing surface of the gut wall the carbohydrates, proteins and lipids are reassembled in the form required, rather than other animal or plant versions Nutrient Major function Major sources Carbohydrates Source of energy, glucose is the main respiratory substrate Starch: potatoes, rice and wheat products, bread, cereals and pasta. Sugars: fruit, smoothies, fizzy drinks, chocolate and sweets Proteins Growth and repair Meat, eggs, cheese, beans, nuts and seeds Lipids Energy, make up part of cell membranes so essential for normal growth Butter and margarine, meat and processed meat, plant oils, oily fish, nuts and seeds Structures of carbohydrates, proteins and lipids Carbohydrates Carbohydrates in our diet include sugars and starches.

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