Biological Substances Used For Energy, Growth, And Bodily Function

1614 Words Sep 28th, 2015 7 Pages
Background/Introduction

Nutrients are environmental substances used for energy, growth, and bodily functions by organisms. Those that are needed in large amounts are called macronutrients. There are three major macronutrients required by humans, carbohydrates (sugar), lipids (fats), and proteins. Each of these macronutrients provides energy in the form of calories. Carbohydrates are easily metabolised, which means chemically broken down, and used as the body 's primary fuel source. All of our bodily tissues have the ability to use the simple carbohydrate, glucose, as energy. When the body uses carbohydrates for energy, it can use other macronutrients for other functions such as tissue growth and repair. Moreover, the brain, kidneys, muscles and heart need carbohydrates to function properly as carbohydrates aid in the synthesis of certain essential amino acids. Carbohydrates are primarily found in starchy foods, for instance, grain and potatoes, fruits, milk, and yogurt. Other foods like vegetables, beans, nuts, seeds, and cottage cheese contain carbohydrates, but in lesser amounts.

Protein is the major constituent of most cells, making up more than 50% of the dry weight. Protein defines an organism, and how it behaves, because the body is simply made of thousands of proteins. Proteins are used to produce new tissues for growth and tissue repair, and regulate and maintain body functions. Moreover, enzymes used for digestion, protection, and immunity are made of protein, and…

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