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Dear Barbara
I had my surgery in 2001. I started at 286 lbs and lost 146 lbs. I
kept it all off until 2005 when I gained 20 lbs. I just had a baby in
January and I gained another 30 lbs. I don’t know what my calorie
intake should be to lose my weight. Can you please help?
Melanie
Dear Melanie,
What an excellent question. We tend to get so wrapped up in how many
grams of protein and ounces of water we should be consuming that often
we totally forget that even after gastric bypass surgery, we are still
the product of calories in versus calories used. And if we don’t watch
calories, then the pounds will return.
There are a few ways to determine how many
calories you should be eating. Many weight loss surgery practices or
gyms have devices that fairly accurately determine how many calories
you use each day. You breathe into a tube for these devices and after
about 15 minutes you are given the total number of calories you
consume daily.
There are also consumer devices that you wear on
your arm that determine your daily caloric expenditure. Body Bugg and
SenseWear are two such devices. They run about $400.
However if you don’t have access to devices,
there is a reasonably accurate formula that you can use called the
Harris-Benedict formula which will give you something called your
basal metabolic rate (BMR) to determine how many calories you use.
To figure out your calorie expenditure using this
formula
For women the formula is:
655 + (4.3 x weight in pounds) + (4.7 x height in inches) – (4.7 x age
in years) = BMR (Women)
For men the formula is:
66 + (6.3 x weight in pounds) + (12.9 x height in inches) – (6.8 x age
in years) = BMR (Men)
Then you have to determine your Activity Level.
This is where it gets tricky.
If you are sedentary: BMR x 20 %
If you are lightly active: BMR x 30 %
If you are moderately active (You exercise 3 to 4
times per week): BMR x 40 %
If you are very active (You exercise intensely 5
or more days per week): BMR x 50 %
If you are extra active (You do hard labor or are
in athletic training, or exercise intensely 5 or more days
per week for 3 or more hours per day): BMR x 60 %
Add your Activity Level number to your BMR =
Daily Calorie Expenditure
As an example if Melanie now weighs 190 lbs., is
5’6” tall, is 32 years old and is lightly active (I am just making
up her height, age and activity level), this is how many calories she
uses:
655 + (4.3 x 190) + (4.7 x 66) – (4.7 x 32) OR
655 + 817 + 310.2 – 150.4 = 1631.8. This would be Melanie's BMR
Since she is lightly active:
1631.8 x .3 = 489.54 (Activity Level)
1631.8 + 489.54 = 2121.34 calories used in a day.
To lose 1 pound of weight, you have to consume
3500 calories less than what you eat. If you want to lose 1 pound per
week, you have to eat 500 less calories per day than what you eat. If
you are not losing weight then you have miscalculated your activity
level or you are not correctly calculating the calories of the food
you are eating. This is particularly true if you aren’t weighing and
measuring your food.
Therefore Melanie should consume 2121.34-500 =
1621.34 calories per day to lose a pound per week.
I hope
this makes sense to you and thank you, Melanie, for the question. |