Low Fat Diets
& Weight Control
Carolyn Classick-Kohn,MS,RD
There
are several reasons why a low fat diet (20-30% of total
calories) is the best diet to follow for losing weight and
maintaining a healthy body:
-
Although any diet that is reduced in calories will cause
weight loss, a low fat diet has been found to be the best
choice for weight maintenance. If you follow a
low fat diet to lose weight, you don’t need to learn new
eating habits to maintain the weight you lost – you’re
already doing what you need to do.
-
Low fat diets are low in caloric density. In other words, a
low fat diet contains foods that are bulky and filling like
whole grains, fruits, and vegetables. So, you can eat a
greater quantity of these foods because they have a lower
caloric value than foods containing a lot of fat. Just
compare 200 Calories worth of celery versus eating 200
Calories worth of potato chips! A lower fat diet looks and
feels like a lot of food, which can be satisfying, and this
helps with weight control.
-
Last, and most important, is the fact that a low fat diet is
the best choice for lowering risk of heart disease,
diabetes, and certain cancers – the killer diseases. It is a
therapeutic diet as well as preventive – if you’re not
following a lower fat diet now, chances are eventually you
will be advised to do so by a physician because the common
risk factors for heart disease and diabetes are so
prevalent. A low fat diet really is a diet for life.
How
Low Can You Go?
If your diet is too low in fat, it can become quite
tasteless, boring, and difficult to eat. In addition, you
need at least 3% of your calories as essential fat, the fats
your body can’t make on its own. Unless there is a medical
need, going below 20% of calories as fat won’t add much
benefit and takes away from the pleasure and taste of food.
For most people, 25-30% of calories as fat is a very good
goal. This is why most of the diets I plan have this
composition. But, not all fat is alike! Read on…
Fats: Not Created
Equal!
Although all fats have the same number of calories per gram
(9 calories per gram, the most calorically dense nutrient),
the type of fats you choose make a huge difference in the
effect upon the body. All fats are either converted to fuel,
or if they are extra calories, will be converted to body fat
as a form of storage energy. But in the process, different
fats have a profoundly different effect on the arteries.
This is why your diet plan is carefully balanced, so that a
majority of your fat comes from “good” fat, and so that you
don’t get too much “bad” fat, the kind that contributes to
heart disease, high blood pressure, and atherosclerosis.
To make things simple, you can think of all types of food
fat fitting into three categories:
Saturated fat:
these are hard fats like shortening, coconut oil, palm oil,
cocoa butter (fat in chocolate) and animal fats like lard,
butter, dairy fat, the fat in the skin of poultry or between
the muscle of animals like steak fat. Anything made with
these fats (like store-bought baked goods, cookies,
crackers, etc.) are sources of saturated fat as well. There
is no question now that these types of fats are linked to
the formation of plaque (the stuff that blocks coronary
arteries) and contribute to heart attacks. Whether you are
trying to lose weight or not, your diet should contain LESS
than 10% of calories as saturated fat. For example, for
people who need 2000 Calories a day, this translates to
about 20 grams of this type of fat a day. If you are
following a reduced calorie plan and your calorie needs are
1400, the saturated fat should be only 15 grams or less per
day. If you are at high risk for heart disease, you should
eat even less saturated fat, 7% of calories rather than 10%.
Use this information to evaluate the healthfulness of a
food. Read the label, clearly if a dessert has 10 grams of
saturated fat per serving, you’re going to need to really
avoid other sources of saturated fat throughout the day to
meet this health goal. Butter has about 7 grams of saturated
fat in one tablespoon!
PersonalDiets™
Eating Guidelines &
Plan-A-Meal
are designed to keep the saturated fat low in your diet.
Choose very lean meats, low-fat and fat-free dairy products,
and avoid hard spreads like butter and stick margarine.
Monounsaturated Fats:
In a heart healthy diet, these fats used to be considered
kind of neutral, not bad, but not great either. Now these
fats are the preferred fats to use, because they have been
found to lower LDL (low-density lipoprotein – the bad
cholesterol) and raise HDL levels – (high-density
lipoproteins – the “good” cholesterol). Good sources of
monounsaturated fat include olive oil, Canola oil and Canola
soft margarine, as well as salad dressings made from these
fats. Other sources are avocados, olives, peanut oil, and
nuts like cashews, macadamia, and pistachios.
This is why it is recommended that you include mostly olive
oil or Canola oil when cooking or baking with fat. Most
commercially produced foods do not use these fats, a good
reason to try and cook from “scratch” whenever possible!
Polyunsaturated Fats:
These
are fats that are liquid at room temperature and are mostly
of vegetable origin. Most vegetable oils like corn,
safflower, and seed oils like cottonseed are
polyunsaturated. Margarine and salad dressings made from
these fats are a good source of polyunsaturated fat as well.
These are also “good” fats, but they do not have a desirable
effect upon HDL levels like monounsaturated fats. Include
some of these types of fats in your diet as a good source of
essential fatty acids, but use more of the monounsaturated
fats when you have control over the type of fat in cooking.
Summary
To summarize eating less fat (25-30% of calories for most
people) is a key nutritional goal. This means controlling
the amount of fatty foods and fat spreads, and following
your eating guidelines for your particular amounts. Beyond
that, get smart about the types of fats you choose – it’s
easy to find “good” fats, and it will make a big difference
to your arteries.
This article on fats is just an introduction, and is
simplified to get us thinking about the two basic concepts
of eating right: eat less fat, and choose the right type of
fats. Other issues, like “trans fatty acids” and “omega-3
fatty acids” are important topics, and are addressed in our
member's only support center.
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