Components of Food
If you are trying to make heart-healthy changes to your lifestyle and diet, it's helpful
to know some basics about nutrition, starting with the components of food.
Facts about calories
You need enough calories to give you energy, but no more than you can burn off. This
is called an energy balance.
If you take in more calories than you burn, you gain weight.
If you take in fewer calories than you burn, you lose weight.
If you balance the two, you maintain your weight.
Even when you are dieting, you shouldn't cut back calories so much that you don't
meet your energy needs. The number of calories you need depends on your age, gender,
and activity level.
Facts about dietary cholesterol
Remember that "cholesterol-free" does not mean "fat-free."
Dietary cholesterol is a fat-like substance found in all foods from animals. This
includes egg yolks, meat, poultry, fish, milk, and milk products.
Because your body makes cholesterol, you don't need it in your diet. But most people
eat foods that contain cholesterol, so it's important not to eat too much cholesterol.
The amount of cholesterol you eat can affect your blood cholesterol levels.
Types of fats
Fatty acids are the basic chemicals in fat. They may be saturated, polyunsaturated,
monounsaturated, or trans fats. These fatty acids differ in their chemical makeup
and structure, and in the way in which they affect your blood cholesterol levels.
Is used by the liver to manufacture cholesterol
Can raise blood cholesterol levels, particularly the LDL or "bad" cholesterol level.
This raises your risk for heart attack and stroke.
Should make up no more than 10% of your daily calories.
Saturated fat can be found in meats, whole dairy products, butter, cocoa butter, coconut,
and palm oils.
Examples of polyunsaturated fats include safflower, sunflower, corn, and vegetable
oils, and soybean oils.
Examples of monounsaturated fats include olive and canola oils.
These are byproducts of hydrogenation. This is a chemical process used to change liquid
unsaturated fat to a more solid fat. Trans fats will be found in an ingredients list
as a partially hydrogenated oil. Trans fatty acids are similar in structure to saturated
fat. They may have a great impact on raising total cholesterol and LDL cholesterol
levels. You should avoid trans fats as much as possible.
Examples of trans fats include stick margarine and fats found in commercially prepared
cakes, cookies, and snack foods.
Your total fat intake should be no more than 30% of your daily calories.
Facts about fats
All fats contain about the same number of calories teaspoon for teaspoon. There is
no low-fat fat.
Fat is the most concentrated source of calories. It supplies more than twice as many
calories per gram as either carbohydrates or proteins.
Most people get too much fat in their diet. This adds to health problems, like obesity,
high blood cholesterol, and heart disease.
Coconut and palm oils have no cholesterol, but they are high in saturated fat. You
should avoid these fats.
Facts about fiber
Soluble fiber is found in foods like oat bran and dried beans. It can lower blood
cholesterol in some people.
Insoluble fiber is found in foods like wheat bran. It helps with weight control because
it makes you feel full. It does not help lower cholesterol.
Facts about sodium
Salt is the main source of sodium in most people's diets.
Sodium and salt are not the same. A teaspoon of table salt contains 2,300 milligrams
Sodium is a mineral needed to keep body fluids at a healthy level. It is also important
for nerve function. It is found naturally in some foods, but most of the sodium in
the average diet comes from seasonings and ingredients added to foods.
You need some sodium for good health, but most people get more than they need. In
some people, too much sodium in the diet can raise blood pressure. This raises the
risk for heart disease and stroke.