Nutrition Flashcards
_ is the sum of all the interactions between an organism and the food it consumes.
Nutrition
_ are organic and inorganic substances found in foods that are required for body functioning.
Nutrients
Foods differ greatly in their _ (the nutrient content of a specified amount of food), and no one food provides all essential nutrients.
nutritive value
Carbohydrates, fats, protein, minerals, vitamins, and water are referred to as _, because they are needed in large amounts (e.g.,hundreds of grams) to provide energy
macronutrients
_ are those vitamins and minerals that are required in small amounts (e.g., milligrams or micrograms) to metabolize the energy-providing nutrients.
Micronutrients
_ are composed of the elements carbon (C), hydrogen (H), and oxygen (O).
Carbohydrates
Two basic types of Carbohydrates: simple carbohydrates () and complex carbohydrates ( and _).
sugars
starches and fiber
_ are biologic catalysts that speed up chemical reactions.
Enzymes
_ is a major source of body energy.
Carbohydrate metabolism
Carbohydrates are stored either as _ or as _. _ is a large polymer (compound molecule) of glucose.
glycogen
fat
Glycogen
Amino acids, organic molecules made up primarily of carbon, hydrogen, oxygen, and nitrogen, combine to form _.
proteins
Amino acids are categorized as _ or _.
essential
nonessential
_ are those that cannot be manufactured in the body and must be supplied as part of the protein ingested in the diet.
Essential amino acids
_ are those that the body can manufacture.
Nonessential amino acids
_ contain all of the essential amino acids plus many nonessential ones.
Complete proteins
_ lack one or more essential amino acids (most commonly lysine, methionine, or tryptophan) and are usually derived from vegetables.
Incomplete proteins
Protein metabolism includes three activities:
anabolism (building tissue), catabolism (breaking down tissue), and maintaining nitrogen balance.
_ are organic substances that are greasy and insoluble in water but soluble in alcohol or ether.
Lipids
_ are lipids that are solid at room temperature; _ are lipids that are liquid at room temperature
Fats
oils
_, made up of carbon chains and hydrogen, are the basic structural units of most lipids.
Fatty acids
_ are those in which all carbon atoms are filled to capacity (i.e., saturated) with hydrogen; an example is butyric acid, found in butter.
Saturated fatty acids
An _ is one that could accommodate more hydrogen atoms than it currently does.
unsaturated fatty acid
Fatty acids with one double bond are called _; those with more than one double bond (or many carbons not bonded to a hydrogen atom) are _.
monounsaturated fatty acids
polyunsaturated fatty acids
, the simple lipids, are the most common form of lipids.
Glycerides
_ (which have three fatty acids) account for more than 90% of the lipids in food and in the body.
Triglycerides
_ is a fatlike substance that is both produced by the body and found in foods of animal origin.
Cholesterol
For these reassembled products to be transported and used, the small intestine and the liver must convert them into soluble compounds called _. _ are made up of various lipids and a protein.
lipoproteins
Converting fat into usable energy occurs through the use of the enzyme hormone-sensitive _, which breaks down triglycerides in adipose cells, releasing glycerol and fatty acids into the blood.
lipase
A _ is an organic compound that cannot be manufactured by the body and is needed in small quantities to catalyze metabolic processes.
vitamin
_ include C and the B-complex vitamins: B1 (thiamine), B2 (riboflavin), B3 (niacin or nicotinic acid), B6 (pyridoxine), B9 (folic acid), B12 (cobalamin), pantothenic acid, and biotin.
Water-soluble vitamins
_ include A, D, E, and K.
Fat-soluble vitamins
_ are found in organic compounds, as inorganic compounds, and as free ions.
Minerals
_ are those that people require daily in amounts over 100 mg.
Macrominerals
_ are those that people require daily in amounts less than 100 mg.
Microminerals
_ is the relationship between the energy derived from food and the energy used by the body.
Energy balance