Unless you are very naive, you probably have already figured out that there exists no miracle diet, wonder pill, or high-tech fitness device that will do the job for you. All the commercial nonsense that you see on TV, in the magazines, and even in your local pharmacy only have one goal: getting your money.
Most of the information that I present here is public knowledge, based on scientific understanding, proven by scientific methods and decades of experience by dieticians, drug-free bodybuilders, and other people who have successfully reduced their body fat. As you will read, the most successful method to lose body fat in a sustainable manner is through a combination of reducing daily calorie intake (how much you eat and drink), eating correctly (what you eat and drink), hunger control (what and how you eat and drink), and physical activity (exercise).
It is not my intention to tell here a very extensive story that explains every aspect in a detailed and highly scientific manner. I rather prefer to keep this a concise and practical guide that can be used by anybody, irrespective of age and background. If you want to know more on any specific topic, I advise you to consult wikipedia.org or search the internet.
Reducing your Daily Calorie Intake
Body fat is stored energy that the body will only use during periods in which there is not enough energy directly available from your food intake. The amount of energy is expressed in terms of calories. One kilogram (2.2 lbs) of body fat represents about 7,700 calories. The only way to reduce your body fat is by lowering your daily food intake so that the body starts burning the stored energy supplies (body fat) to get the energy it needs.
The body needs energy (calories) to perform its basic functions to stay alive (body temperature, thinking, breathing, digesting food, etc.) and to perform physical work (walking, working, exercise, etc.). The total number of calories that your body uses daily depends on your gender, age, length, weight, muscle mass, and physical activity. The simplest (but not so accurate) method to estimate your daily caloric need is to multiply your body weight in kg by 33 (or multiply your body weight in lbs by 15). More advanced formulas to calculate your daily caloric need can be found on the net. The most accurate way to determine your personal daily caloric need is to count your average daily caloric intake during a long period of stable body weight. You can also try out my calculator to estimate your daily caloric need.
The only way to reduce your current body fat is by letting your body burn more calories than you eat and drink. This can basically be accomplished in two ways: by keeping your daily caloric intake below your daily caloric need, or by increasing your physical activity so that your daily caloric need increases above your daily caloric intake. Simply said: eat less and move more.
If you want to lose body fat, it is recommended to eat between 15 and 30% calories less than your daily caloric need. In order not to shock and block your metabolism, which is very contra-productive, always change your calorie intake gradually. I recommend you to do it in steps of 5 or 10% and letting your body adjust for at least a couple of weeks between consecutive changes.
An average weight loss between 2 and 5 pounds (1 kg = 2.2 lbs) per month is best to reach a sustainable long-term result. Note that, as your body weight goes down, you will have to further decrease your daily calorie intake to stay below your new daily caloric need, and because your metabolism will gradually slow down during a calorie restricted diet. Daily calorie levels should never drop below 1200 calories for women or 1600 calories for men of average stature.
When you finally have reached your target body weight, increase your calories very slowly (over a period of several months) back to your new daily caloric need. If you do it too fast, you will start gaining weight again, and might end up even fatter than you were before your diet.
There exist four different kinds of nutrients that contain calories: proteins, carbohydrates (carbs), fats, and alcohol. Let's take a closer look at them.
Proteins
One gram of protein contains 4 calories. Sources of protein are: chicken, turkey, meat, fish, eggs, milk, quark cheese, yogurt, protein powder, nuts, beans, peas, and soy. Proteins from animals (meat, poultry, milk, fish) are more nutritious than proteins from plants (nuts, beans, peas, soy).
Carbohydrates
Carbohydrates (carbs or sugars) contain 4 calories per gram. Sources of carbohydrates are: oats, potatoes, yams, rice, pasta, table sugar, fruit, vegetables, bread, couscous, candy, sweet drinks, fruit juice, milk, cookies, chocolate, corn, cereals.
Fats and oils
Fats and oils contain 9 calories per gram. Sources of fats are: butter, oil, fat meat, fat fish, sausages, egg yolks, sauces, fat milk, cheese, cookies, fries, chips, nachos, nuts, olives, chocolate. Fats from animals are worse for your cardiovascular health than oils from plants.
Alcohol
One gram (1 ml) of alcohol contains 7 calories. For example: 1 liter of sweet wine (15% alcohol, 15% sugar) contains 150 ml of alcohol (= 1050 calories) + 150 g of sugar (= 600 kcal) = 1650 calories per liter. As a comparison: non-fat milk contains only 340 calories per liter and orange juice contains 425 calories per liters.
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