Exercising but Not Losing Fat? Maybe This is the Problem by Dr. Michael Colgan

Dr Michael Colgan -- 14 March 2013
from Isagenix Nutritional Sciences

Image from compareweightlossprogram.com

One of my fat loss clients, has been steadily losing about one pound of fat per week on our nutrition and exercise program, 32 lbs overall. Eager to make a Size 4 for the summer, she thought she wasn’t losing enough. So she joined another gym and hired a trainer.

First week he had her jogging on the treadmill, a hard puff-and-pant exercise for an overweight girl who never jogged. He told her she had to keep going for 30 minutes or she would not lose any fat. Then she had to do an aerobics class for 30 minutes. But she was allowed an oatmeal muffin and some nice organic fruit juices to keep her going. She did both bouts of exercise for five days for one week, then came back to me exhausted, pleading that she had gained weight, and that perhaps ours was the best way.

As often occurs, there were several things wrong with the gym exercise she was given. First, the treadmill jogging was anaerobic for her. That is, she was puffing and panting, indicating a shortage of oxygen. Bodyfat is calorie dense. At 9 calories per gram it needs plentiful oxygen to enable the body to burn it. All endurance athletes know this well. Their VO2 max is the maximum aerobic effort they can make and still burn fat. Any greater intensity and they will turn anaerobic, stop burning fat, quickly burn up all their sugar, and hit the dreaded “wall”.

Second thing wrong; the trainer didn’t give her a diet beyond telling her some healthy things to eat, and he encouraged her to take fruit juice during exercise to keep her going. She told me she also had an oatmeal muffin and juice at the gym beforehand, “or I just couldn’t face it”. We estimated that she had at least 400 calories before starting and another 200-400 during the exercise, about 600-800 extra calories per day, a total of 3,000 – 4,000 extra calories for the five workouts. Bottom line. Any calories you put in your stomach before or during exercise to lose fat, will be preferentially used first by the body. So she was setting herself up to grow plump as a goose.

How much fat did she burn? If you could burn fat perfectly, (remember, no calories in the stomach and no panting) aerobic treadmill work or aerobics classes can use up to 200 calories of fat in an hour. So, if everything was perfect, she could burn a total of 1000 calories (about 4 ounces of fat) over the 5 workouts. Because of the mistakes in her program, likely she burned half that, probably only 500 calories (only 2 ounces of fat loss) over the whole 5 workouts. Meanwhile she ate an extra 3,000 – 4,000 calories, at least half of which would be turned to fat (6-8 ounces of fat gain) just to be able to do the workouts.

For comparison, steady housework uses about 130 fat calories per hour. It’s a good level of effort for burning fat, and costs nothing. Because you are in proximity to food, however, you have to resist eating anything, or you switch to burning mainly sugar. Two hours housework a day will burn far more fat than most gym workouts. Let’s consider perfect fat burning again: 2 hours housekeeping per day x 6 days a week = 12 hours. Twelve hours at 130 calories = 1,560 calories (6 ounces of fat loss) per week. Beats her gym workouts – no contest.

Whenever I see nonsensical gym programs for fat loss I turn back to the rigorous meta-analysis of 25 years of controlled research on exercise and fat loss published in The International Journal of Obesity. These were all medium intense gym programs for fat loss, supervised and motivated by university trainers. They counted only people who attended regularly for 4-6 hours per week. Average weight loss over all the studies was 6.4 lbs in 15 weeks. That’s an average loss of only 7 ounces a week.(1)

The researchers also examined studies that added a reasonable nutrition program to the exercise. Results got much rosier. The same meta-analysis examined the best of the exercise-plus-diet studies over 25 years. In 15 weeks, on a good diet plus 4-6 hours per week in the gym, subjects lost an average of 24.2 lbs. That’s a loss of 1.6 lbs per week.(1)

So, if we compare the exercise alone groups (loss of 6.4 lbs) with the exercise-plus-diet groups (loss of 24.2 lbs), adding the nutrition resulted in a loss of 17.8 lbs of fat. Now you know, no matter what anyone tells you, fat loss is mostly dependent on what and when you eat.

My client is back on her diet track now. After torturing herself very expensively in the gym for 5 hours, our body composition machine showed a gain of 4 lbs, about 3 lbs of water because her body was swollen from the effort, and about 1 lbs of fat. By working out until (in her own words), “my legs turned to Jello”, she had wiped out a week of the fat loss she was getting from a simple diet of two shakes and one meal a day. As I have written many times before, the usual exercise program is excellent at removing fat – but only from your wallet.

If you want to learn more secrets of weight loss go to The Healthy Helms Website.

 1. Miller WC, Koceja DM Hamilton EJ. A meta-analysis of the past 25 years of weight loss research using diet, exercise or diet plus exercise intervention. Int J Obesity, 1997;21:941-947.