Diet Success Means Knowing all About Calories


Written on August 6, 2008 – 1:47 pm | by Jeff Ainslie

success One of our most common questions on the show is “How many calories should I be eating”? Here is a post that I wrote about 8 months ago, that I’m re-posting so everyone can figure this out or remind themselves of how to do it.

If you never want to go on a diet again, the simplest way is to start eating like a person at your goal weight and keep doing it. You will lose weight faster at the start and it will slow as you approach your goal weight, but you will never be “on a diet” again.

First of all, you need to know your BMR (basal metabolic rate), which is how many calories your body burns in a day to stay alive. If you were asleep for 24 hours, your BMR would be the amount of calories you would burn.

Here is an online BMR Calculator.

To get a realistic measure of the total calories that you burn in a day, you need to multiply your BMR by a number that represents how much activity that you do in a day.

  • If you get little or no exercise, multiply your BMR by 1.2.
  • If you exercise lightly or take part in easy sports one to three times a week, multiply your BMR by 1.375.
  • If you are moderately active — three to five times a week — multiply your BMR by 1.55.
  • If you are very active — hard exercise or sports six to seven times a week — multiply your BMR by 1.725.
  • If you are extra active — very hard exercise or sports and a physical job — multiply your BMR by 1.9.

Here are some ballpark figures that I worked out for a weight loss of 50 lbs.

5’5″ woman, 30 years old who exercises lightly (BMR x 1.375)

175 lbs – 2165 calories per day
125 lbs – 1850 calories per day

If this woman eats 300 calories per day less on a continuous basis, over time she will lose 50 lbs and maintain that weight. With eating 300 calories less per day, she can expect to lose about 0.6 lbs per week at the start.

5’10″ man, 30 years old who exercises lightly (BMR x 1.375)

225 lbs – 2950 calories per day
175 lbs – 2550 calories per day

If this man eats 400 calories per day less on a continuous basis, he will also have a 50 lbs weight loss. With eating 400 calories less per day, he can expect to lose about 0.8 lbs per week at the start.

This is how most people put on weight in the first place. They simply eat a few more calories per day on a continual basis and over time they store more and more fat. They eat the calories of a heavier person, and gradually become that heavier person.

It is clear that diets don’t work because as soon as people go off of a diet, they start eating like they did before the diet. The best approach is to know your goal weight and then figure out how many calories per day you will need to eat to maintain that goal weight.

Start to eat your “maintenance” calories at the start of your weight loss. If you eat like a thinner person, you become that thinner person. You will gradually lose the weight and never feel deprived along the way. It’s not a sexy weight loss plan, but it works in the long term.

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  1. 6 Responses to “Diet Success Means Knowing all About Calories”

  2. By hernan on Oct 13, 2008 | Reply

    thanxs for all the good info……

  3. By Audrey on Jan 25, 2009 | Reply

    Hey there-

    I’m a new listener and really enjoy your podcasts. I’m dabling around on your site to help me map out my weight loss plan. I am currently following the weight watchers plan as it allows me to easily track my calories and lists the calorie information in many of my favorite foods online. It also promotes portion control and monitoring my daily food intake.However, after listening to your show, I have a few concerns with the program.

    #1: Weight Watchers allows a weekly allowance of 35 “bonus” points (or 1750 calories). This is by far my favorite part of the program as it allows me to enjoy some not-so-healthy foods. However, on a previous podcast, you mentioned that one of the keys to weightloss is keeping within your calorie range on DAILY basis. So, my first question is, if I save all of these points for a one “all-out” day, and eat these calories over and beyond my daily allowance (29 points or 1450 calories) am I really doing myself any good?
    #2: I’m 25 years old weight 229 pounds and am 5’10. According to the BMR calculator, I have a BMR of 1854.7 calories. I’m moderatly active so this equates to 2874.79 calories. My goal weight is 165 pounds with a BMR of 2442.80 as a moderatly active woman. This is approx. a difference of 432 calories a day. My concern is Weight Watchers has me eating less than that, even if I divide the 35 bonus points evenly over the week (1700 daily calories). The difference in my goal weight BMR (2442.80)and my current weight watchers calories allowance (1700) is 742.80. Is this a healthy allowance? I must say that WW also allows you eat “activity points” that you earn through the week which may make up for the difference, but I just wanted to get your take in general on the program and the math.

    I appreciate any feedback you may have.

    Thanks!

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