A recent study showed that most American’s do not know how many calories they need to eat each day to maintain their weight. Honestly, I’m not surprised. This also means people do not know how much they need to eat to lose weight (for most of us, eating to gain weight is not an issue). In order to help you know your calorie needs, I’m republishing one of my first newsletters. It is longer than usual, and you’ll need a calculator, but by the time you are done, you’ll have a good idea about how many calories you need per day.
Your “Calorie Bank Account”
My goal was to have a short newsletter. Well, this one is longer than the others, but has some great information for you.
Each of us needs a certain number of calories in a day to maintain our weight. Eat less than that magic number over a period of days and you should lose weight. Eat more over a period of days and you gain weight. One way that helps people get their heads around this concept is to think about your daily calorie allotment as a “calorie bank account.” At the beginning of each day, you have a certain number of calories to “spend” through the food and beverages you choose to consume. How you spend those calories are up to you. Do you really want to spend your calories on a Snickers bar or would you rather have an apple and save them for dessert later?
The first place to start is to determine how many calories you have in your bank account. The best way to do this is to have a metabolic test done to measure your resting energy expenditure. However, not everyone has access to this equipment. The second best way to get a “best guess”, is to use an equation. I prefer the Mifflin-St. Jeor equation among all the ones out there. There are two steps to the equation. First you calculate your Basal Metabolic Rate (BMR) – basically the calories you’d need to stay alive if you were sleeping all the time. Then, you multiply that number by an activity factor to get an estimate of the number of calories you need per day based on your activity level. Get out a pencil, paper and calculator. . .
Now, before I give you the equation, here are a few words of CAUTION.
- The equation is an estimate. You need to pay attention to your weight to determine if the estimate is right. If you’re gaining and don’t want to, reduce the calories. If you’re losing and don’t want to, increase the calories.
- Be honest about the information you plug into the equation. Remember the saying “garbage in/garbage out”? Well, this is a prime example of that situation. If you aren’t honest about what you put in, you’ll probably get extra “garbage” on your waist, hips, thighs, etc.
Now. . . .Here are the Mifflin-St. Jeor equations. One is for men, the other for women:
- Male: BMR = 10×weight + 6.25×height – 5×age + 5
- Female: BMR = 10×weight + 6.25×height – 5×age – 161
Notes:
- Weight is in KG. Take your weight in pounds and divide by 2.2
- Height is in centimeters. Take your height in inches and multiply by 2.54.
- Age is in years.
Now that you’ve determined your BMR, you need to realistically determine your activity level. To get a better feel for your activity level, you can use Metabolic Equivalents (METs). I’ll include how to do this in another newsletter. The activity levels are:
- 1.200 = sedentary (little or no exercise)
- 1.375 = lightly active (light exercise/sports 1-3 days/week)
- 1.550 = moderately active (moderate exercise/sports 3-5 days/week)
- 1.725 = very active (hard exercise/sports 6-7 days a week)
- 1.900 = extra active (very hard exercise/sports and physical job)
Take your BMR and multiply it by your activity level (the number in front of the descriptions) and it gives you the calories you need for a day. You can also choose numbers between the given activity levels. For example, if you feel you are between moderately and very active, you could choose 1.6 or 1.65.
If you work out a lot and know the calories you burn during your workouts, I would recommend using the activity level of your daily life (e.g. sedentary or lightly active if you sit at a desk all day) then add on the calories from your workouts.
Example:
We will calculate the daily calories for a 40 year old female who weighs 155 pounds and is 5’8″ tall and works out hard 6 – 7 days a week. She has a sedentary job and sits at the computer most of the day.
- 155 pounds / 2.2 = 70.45
- 5’8″ = 68 inches x 2.54 = 172.72
- Female: BMR = 10×weight + 6.25×height – 5×age – 161
- BMR = (10 x 70.45) + (6.25 x 172.72) – (5 * 40) – 161
- BMR = 1423
- Total daily calories = BMR * activity level
- Total daily calories = 1423 * 1.725
- Total daily calories = 2455
Now that you know your total calories, what next? Well, if you want to lose or gain weight, you need to subtract or add calories to that number. A pound is approximately 3500 calories. If you want to lose one pound per week, you need to eat 3500 calories less per week, or 500 calories less per day. If you want to lose 2 pounds per week you need to eat 1000 calories less per day. If you want to gain, then add that amount to your total daily calorie number. Remember, safe and sustainable weight loss is considered no more than two pounds per week.
If our lady above wanted to lose weight, she would need to eat 1955 calories per day to lose 1 pound per week or 1455 calories per day to lose two pounds per week. The other side of the coin is that you can “add” calories to your bank account through additional exercise. This lady is pretty active already, so adding more may not be a good idea. However, if you are not very active, you can deposit calories into your account by being physically active.
Now that you know your daily calorie bank account balance, you can spend those calories with the foods you eat and beverages you drink. The best way to do this is just like keeping a checkbook register is to log your food (yeah, I hear the groans). However, studies have found that those who are successful at losing 30 pounds or more and keeping it off use food logs. One of my favorites is
FitDay. They have a free version on the web or a version you can download to your computer for a small fee. Another favorite is
Daily Plate which has a free version, an enhanced version for a small fee, and also has an iPhone app (Live Strong) that syncs with the internet version so you can track at your desk and on-the-go. I also like
VidaOne’s My Personal Diet. My Personal Diet has both a PC and mobile version. Both have a comprehensive list of foods which makes it pretty easy to enter in your daily intake. It does take a few days to get into the groove of using these programs, but they are an invaluable tool. If you don’t want an electronic food log, you can use a simple notebook. However, it is important to track the calories (at a minimum). Tracking carbohydrates, protein and fat is better. There are a lot of books out there that have calorie, carb/protein/fat information as well as online resources like
CalorieKing. The important thing is to track you food and drink (yes, don’t forget those liquid calories) to know where you stand.
Not sure if tracking your food is for you? Well, like other things I’ve suggested, try it for a few days and see what you think.