A calorie is a measure of food energy. One calorie is the energy amount that is needed for a one degree centigrade temperature raise of one gram of water. We have different caloric needs. However, we all need the calories from food in order to stay alive, be active and perform our daily activities.
How Many Calories Do I Need?
A lot of people are wondering ‘how many calories should I eat a day?’. One approach is to contact a nutritionist and get professional advice. In case you would like to determine your need even faster than that, you can use a calorie calculator. There are many such calculators available online. They estimate your daily calorie needs, based on the specific data you enter, eg. gender, age and so on. You can start following the recommendation and monitor how you feel for one week. After all, what these calculators provide is estimation; you can alter it to make sure you meet the needs of your body.
As a rough guideline, men generally need to eat around 2,000 to 2,500 calories and women 1,500 to 2,400 calories. However, this will be different by age group, weight, height, etc. Men that are 20 to 30 years old generally need up to 2,400 calories a day provided they don’t have too much physical activity. Women in the same age group typically need up to 2,000 calories a day, also provided they don’t exercise intensely. Men aged 31 to 50 need up to 2,300 calories a day, while women in the same age group up to 1,900 calories a day. Above the age of 50, men need up to 2,200 calories, while women up to 1,700 calories a day. If they have an more intense physical activity, both men and women will need more calories.
In the case of children, there is a similar gap between girls and boys in terms of caloric needs. In general children up to 3 years old need around 1,000 calories and the ones up to 8 years old, around 1,500 calories per day. The boys that are between 9 to 18 years old will need up to 3,000 calories a day, while the girls up to 2,200 calories a day.
Basal Metabolic Rate (BMR)
The basal metabolic rate or BMR is an important concept related to the daily calorie need. The BMR of an individual measures the amount of calories needed for the regular body processes, at your current weight level. A rough formula is to just multiply your body weight by 10. This means that if your weight is for example 140 lbs. then your BMR is 1400 calories per day. This rough formula does not take into account the physical activity, though. There are formulas that take this into account as well, eg. The Harris-Benedict or Katch-McArdle formulas.

How To Determine Your Activity Level
In order determine with greater accuracy your daily calories need, you do need to take into account your physical activity level. This means that you must understand if you are sedentary or active. To note, active can also mean lightly active, moderately active or extremely active.
Sedentary means that you virtually have no physical activity built into your lifestyle. You don’t do much at work and you also don’t exercise in your spare time. Then, if you regularly of for a minimal physical activity such as walking, then this means you are lightly active. In case you go for exercising or other physical activity that is more intense than walking, you are moderately active. And finally, if your work involves heavy physical activity or if you regularly do sports, you are extremely active.
One approach you can take in order to calibrate your diet with your need as per your physical activity level is to keep a two weeks diary. Record everything you eat and all the physical activity you do. You should try to keep the diet and physical activity schedule you typically have. Then monitor your weight. If you lost or gained weight, you can adjust your diet accordingly. In case you have roughly the same weight level, it means your diet is well suited to your activity level.
Calorie Rich Foods
These foods that are high in calories are usually rich in fats and carbs. They include for example butter, high fat cheese, mayonnaise, sweets, bread and so on. If you plan on losing weight, you should stay away from these foods as much as possible. You should double-check the calorie content of any food you plan to eat, as you may have surprises. For example, even some fruits are heavy in calories. Do you know how many calories there are in a banana? An average sized one contains 100 calories, so you need to eat them with care.
Negative Calorie Foods
These are the type of foods that need a lot of effort from your body in order to break them up and use them. Such foods burn actually more calories than they bring in, so they are ideal for those that plan on losing weight. Examples of such foods are: lettuce, spinach, celery, onions, broccoli, carrots, cucumbers, tangerines, cranberries, grapefruit, lemons, strawberries, apples.
More info about negative calorie foods can be found here:
- http://www.naturalnews.com/030912_negative-calorie_foods_burn_fat.html
- http://lifehacker.com/331319/fifteen-foods-that-burn-more-calories-than-they-contain
- http://www.mayoclinic.com/health/negative-calorie-foods/AN02040
Fat Burning Foods
There are certain foods that are believed to be beneficial for weight loss, either because they drive your metabolic rate up and help you burn more fat, or because they support the fat burning process in another way. Examples of such foods are: green tea, spinach, avocado, eggs, oily fishes, olives.
More about fat burning foods here:
- http://www.momswhothink.com/diet-and-nutrition/fat-burning-foods.html
- http://howtoburnfat101.com/fat-burning-foods/
Empty Calorie Foods
These are foods that can be quite heavy in calories, while providing no nutrients to your body. They do not bring you any benefits when you include them into your diet. They do however add a lot of calories to your daily intake. The best approach is to avoid them, as they typically have a negative effect on our health. The people trying to lose weight should definitely take them out completely from their menus. Such foods include: sweets, soft drinks, many types of fast food and so on.
More about empty calorie foods:
- http://www.cdc.gov/healthyweight/calories/index.html
- http://www.choosemyplate.gov/foodgroups/emptycalories.html
- http://caloriecount.about.com/foods-empty-calories-q639
In order to lose weight, you should in principle bring in fewer calories than your body consumes. This does not mean that you should lower your calorie intake to the extreme. This would probably result in weight loss short term, but it could severely affect your health and eventually block the weight loss process, as well.
A good approach is to determine your current caloric need in order to maintain your weight, as described above. Then, you can devise a plan so that your daily calorie intake is below your need, by a few hundred calories. You should not try to go for a dramatic drop in your daily calorie level. It is more important to have consistency over a longer period of time, rather than take a too radical approach.
In order to make sure you stay daily below a certain calorie level, you need to have knowledge on the calorie content in different foods. There are a lot of tables with such data available everywhere. It is not very convenient though to check the table out several times a day. Some people are fine with this approach, but some prefer more simplicity. You can also do such calculations for a short period of time until you get a feel on what is the caloric content of different foods portions. After that, you can just make rough estimations and quit making calculations for every meal. You need to find a way that works for you and that you can apply consistently, until you get results.
You also need to take into account that your body adjusts your metabolic rate in response to your diet. If you for example reduce your calorie intake, this will lead in the beginning to weight loss. However, your body adjusts gradually to the new circumstances, lowering your metabolic rate in order to match your new diet. Therefore, you are very likely to hit a plateau in your weight loss efforts. There is a solution to this, though – exercise!
Exercising raises your metabolic rate and helps prevent reaching a weight loss plateau. If you reduce your calorie intake and raise your physical activity level at the same time, this creates a synergy that greatly boosts the success of your weight loss efforts. In terms of exercise, you can start at the intensity point you are prepared for. You should not push your body unreasonably, but rather build-up the intensity in time. Consistency is vital, as in the case of every diet. Typically you need to do a lot of cardio exercises like running, swimming and so on. However, weight training for example also has a fat burning effect, as it drives-up your metabolic rate for several hours after you finish exercising.
For best results you need to continuously monitor and adjust both the calorie intake and the workout plan. Your metabolic rate is continuously changing in response to what you do and you need to manage this process well in order to lose weight. A personal trainer can provide support in developing the right exercise plan for you. This is a service you can benefit from at most gyms, but it is not a compulsory step you need to take.
Calorie Intake And Diets
If you are trying to lose weight, you have probably already researched a few diets. There are a lot of them and we are bombarded with more and more each day. However, a great care is needed when choosing a diet, as what works for someone does not necessarily work for us, as well.
The various diets have very different approaches to weight loss. Some of them promote an extremely low calorie intake for a certain period of time. For example, in the second phase of the HCG diet plan, you need to keep a roughly 500 calorie diet per day. The diet proponents claim that the hormone you need to take while on diet, i.e. HCG helps suppress appetite, so that you don’t starve. But it is still an example of an extreme calorie reduction.
There are other diets that do not focus on calorie reduction, but on the food selection instead. For example, if you follow the Atkins diet, you will take out the carbs from your diet. It is true that a lot of the high carbs foods are also very heavy in calories and you just take them out of your diet. But you can eat quite a bit more than in the case of a diet that restricts your calorie intake dramatically.
Another way to look at foods is not only in terms of the calorie content, but also in terms of glycemic index, i.e. GI. This is a measure of how foods affect blood sugar. The one with high GI drive a steep increase in blood sugar and this leads to weigh gain. The ones with low GI help keep a stable sugar level in the blood and facilitate weight loss. Even if you keep a diet and you are allowed to eat carbs for example, it is much more beneficial to consume low GI carbs. They will keep you full for longer and reduce cravings. Cut out pasta, fast foods plus sweets and increase your intake of veggies, some fruits, brown rice, quinoa and so on.
To conclude, the optimum calorie intake for you depends on your gender, weight, physical activity level and on your particular combinations of other factors that impact caloric need. There are calorie calculators and food calorie content tables available, to help you take control over your diet. However, you don’t need to spend all day with calculations. Developing a basic knowledge, gaining some experience and applying common sense will take you a long way. The best approach is to contact a nutritionist for professional advice. After that you can develop your own approach to keeping a healthy diet, with the right calorie intake level for you.
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