When people talk about the calories in food, what do they mean? A calorie is a unit of measurement — but it doesn’t measure weight or length. A calorie is a unit of energy. When you hear something contains 100 calories, it’s a way of describing how much energy your body could get from eating or drinking it.
Most foods and drinks contain calories. Some foods, such as lettuce, contain few calories. (A cup of shredded lettuce has less than 10 calories.) Other foods, like peanuts, contain a lot of calories. (A half of a cup of peanuts has 427 calories.)
You can find out how many calories are in a food by looking at the nutrition facts label. The label also will describe the components of the food — how many grams of carbohydrate, protein, and fat it contains. Here’s how many calories are in 1 gram of each:
* carbohydrate — 4 calories
* protein — 4 calories
* fat — 9 calories
That means if you know how many grams of each one are in a food, you can calculate the total calories. You would multiply the number of grams by the number of calories in a gram of that food component. For example, if a serving of potato chips (about 20 chips) has 10 grams of fat, 90 calories are from fat. That’s 10 grams X 9 calories per gram.
Some people watch their calories if they are trying to lose weight. Most kids don’t need to do this, but all kids can benefit from eating a healthy, balanced diet that includes the right number of calories — not too many, not too few. But how do you know how many calories you need?
Low calorie diets work on the simple principle that calories give us fuel for all the activities and functions our bodies undertake. Therefore, if you reduce calories to less than the body requires, it will burn fat to replace them.
How to Start a Low Calorie Diet
* Equip yourself with a calorie counter
Nowadays there are many books and publications with information on the calories contained in all kinds of food, both natural and ready meals. There is also extensive information online.
* Work out how many calories you are going to eat each day.
Usually this is around 1500 to 1800 for a woman per day with a sedentary lifestyle, a similarly inactive man would probably need around 2000-2200. If you are a very active person, though, you would need to increase your calorie intake by as much as 600 to 800 calories per day.
* Get into the habit of reading the labels on food
Many include the number of calories. Check whether the figure quoted is per pack, or by weight, or per portion.
* Work out which foods you can enjoy on your diet
Read your calorie counter and and stay within your calorie limits. It might help to work out a menu for the first week or two.
* Keep a food diary
It is so easy to say “Low calorie diets don’t work for me” or “I can’t lose weight, it must be my metabolism (or glands)” when the simple truth is that you forget to count the doughnut you had for elevenses or the icecream you ate to cool down and maybe the bar of chocolate you had because you were feeling a bit depressed. Take your food diary around with you and write down every single thing you eat, no matter how small or seemingly insignificant. Then, at the end of the first week, examine it carefully. Remember YOU are the one who wants or needs to lose weight so, if you cheat, you are only cheating yourself.
* Use a smaller plate than usual
It will make you feel less deprived and stop you putting too much food on your plate when serving out meals.
* Don’t feel guilty if you don’t ‘clean your plate’
There are worse crimes than not eating everything you are served.





