Low Fat Diets

Key points
- High fat intake contributes to excess body weight, since a gram of fat has about twice as many calories per gram as carbohydrates and proteins.
- Fat gets all of the attention for many good reasons.
- It's true that a diet high in fat can lead to weight gain.
- A low-fat style of eating is important for maintaining a healthy weight and preventing heart disease.
Why Is it Important to Reduce Fat Intake?
High fat intake contributes to excess body weight, since a gram of fat has about twice as many calories per gram as carbohydrates and proteins.
Whether you are trying to lose weight, lower blood cholesterol levels or simply eat healthier, you'll want to limit total fat intake.
Why Do Most Diets Focus on Reducing Fat?
Fat gets all of the attention for many good reasons. Consider these facts: Fat can raise cholesterol levels in the blood. A high cholesterol level is a leading risk factor for heart disease.
In addition, some fatty foods (such as bacon, sausage, and potato chips) often have fewer vitamins and minerals than low-fat foods. (Note: Protein sources, especially red meat and dairy products, often contain fat. Lean meat, fish, poultry without skin, beans, tofu, low-fat yogurt, low-fat milk, low-fat cottage cheese and tuna fish packed in water are good, low-fat sources of protein.)
As mentioned, fat has about twice as many calories per gram as carbohydrates and proteins. A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories. In other words, you could eat twice as much carbohydrates or proteins as fat for the same amount of calories.
Will I Lose Weight if I Eat Low-Fat Foods?
It's true that a diet high in fat can lead to weight gain. But it takes more than just eating low-fat foods to lose weight. You must also watch how many calories you eat. Remember, extra calories even from fat-free and low-fat foods get stored in the body as fat. Many times people replace high-fat foods for high-calorie foods, like sweets, and gain weight rather than lose weight.
To lose weight, you need to burn more calories than you eat. You can achieve this goal by exercising and by eating less fat and calories. Exercise burns calories. Consult with your doctor before starting an exercise or diet program.
How Much Fat Should I Eat?
A low-fat style of eating is important for maintaining a healthy weight and preventing heart disease. The American Heart Association recommends limiting total calories from fat to less than 30%. That's about 65 grams of fat or less a day if you eat 2,000 calories a day.
How Can I Know How Much Fat I am Eating?
Learn about the foods you eat. Fat and calorie listings for individual foods can be found in nutrition books at your local library and on food packages.
Read nutrition labels on food packages. Nutrition labels show the number of grams of fat per serving. They also show the daily percentage of fat provided in each serving. In other words, if the daily percentage of fat per serving is 18%, each serving provides 18% of the total fat you should eat for the day. Choose a brand that has a lower fat percentage. (The daily percentage value is based on a number of calories listed on the nutrition label, usually 2,000. Your calorie needs may be higher or lower.)
Written and revised by
Andrey Nailor, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
health.am provides general information, not medical advice. Always consult a qualified health professional about your own health.
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