Showing posts with label TDEE. Show all posts
Showing posts with label TDEE. Show all posts

Monday, May 23, 2016

Weight Loss - The Internet is Filled with Stupid Ideas

As most of you know, I spend a lot of hours reading articles and blogs posted by other fitness minded individuals looking for “new” information or research, something I can use to improve my skills and understanding. Most of my time is spent on the weekends going through blog after blog and article after article looking for something unique. Instead of finding unique articles, I have been finding unique viewpoints on old material. There is value in having a disagreeing viewpoint when it comes to creating traffic, but sometimes, the foundation of disagreement is so stupid it can’t be ignored. Two posts I have seen lately are how a lady “stopped exercising and lost weight” and how “simply cutting carbs results in fat loss”. Total click-bait, but I fell for it and got sucked into the posts and scared for the thousands of people that would read and believe these posts.

Between the magic bullet articles that promote eliminating entire food groups, “detoxing” with lemon vinegar tea coffee bean extract, or “15 fast fat burning foods”, common sense about sustainable weight loss takes the backseat because it isn’t what people want to hear. People don’t want to hear that it isn’t quick or easy. They don’t want to hear that it takes time, effort, and a little bit of common sense. They don’t want to hear that sometimes you can do everything the way your favorite fitness icon does it and fail. Sometimes their lives are so hectic they just need the Disney ending to their struggle with eating, body-image, and fitness. Sadly, Walt didn’t figure out how to make fairy-tale magic happen for us.

This would have been a short post had it not been for the number of posts and messages we receive from similar cases. The lady that stopped exercising and lost weight was like so many people first starting out. She was doing everything right, or so she thought; five hour-long sessions per week, tracking her calories in, and tracking her calories out. Where she went wrong was instead of having weight training and cardio, she was only doing cardio like rowing, walking, etc. She also made the huge mistake of estimating her caloric burn and then eating back those calories. After some time of trying to lose weight this way, she was injured by her dog and unable to be active. Because there was no exercise, there were no calories to eat back and amazingly, she lost weight! This led her to the conclusion that not exercising and eating normally is the way to go instead of performing exercise, building muscle, and still eating in a deficit by not eating back your calories.

Many people forget that building muscle is healthy for our metabolism and believe that a low scale weight is all they need. When we move from active to couch potato, our body will waste muscle, especially when faced with a caloric deficit. Remember, a pound of muscle takes up less space in the body than a pound of fat, so while the scale drops, the tape measure may increase as the body loses muscle but builds up fat. In the evil scenario, we lose precious muscle and reduce our intake, slowing our metabolism. Similar to the “The Biggest Loser Scenario” where contestants lose weight only to regain it years later, losing weight only through reduced intake is likely to result in the regain of fat. When discussing TBL and the downfalls, I’ve had more than a few people misinterpret my objection to mean not eating at a deficit. That is not what I am suggesting at all. I am suggesting having a set number of calories regardless of whether you train or not. I am suggesting a small to moderate deficit caused primarily by activities, specifically resistance exercise. No matter how you cut it, weight loss requires some form of deficit.

Another factor the post brought to light is the concept of “eating back” exercise calories. One popular food / activity tracker in particular encourages you to eat back your exercise calories by giving you a low target and increasing your target intake as you exercise. I find this to be a poorly thought out recommendation for several reasons. Calorie labels / trackers rely on averages. As PN points out in “The Surprising Problem with Calorie Counting - Calories In” it is very hard to reliably say how many calories we are actually consuming. Further, calorie expenditure, even when monitored with a good heart rate monitor has a minimum 10% error. The second part of “The Surprising Problem with Calorie Counting - Calories Out” breaks down just how bad estimates are for predicting how many calories we burn through exercise. Combine the inaccuracy of calories listed on a label with the variance of calories burned and you have the beginning of a recipe for disaster when you attempt to eat back your calories.

Some believe that adjusted macros will create fat loss. Simply adjusting macro intake won’t translate to fat loss or weight loss with few exceptions. Yes, I acknowledge the concept of a recomposition, which is the process of building muscle and losing fat at the same time. No, your body doesn’t turn fat into muscle and no, it isn’t easy. The post proclaiming all that is needed to lose fat is reducing carbohydrate intake is a sad oversimplification. Regardless of how low you get your carbohydrate intake there are other factors:

Total caloric intake and deficit - if there’s no deficit, the body has no need to burn fat stores.

Stress - causes Cortisol release. Cortisol is a factor in the accumulation of visceral fat and sugar cravings.

Sleep - it’s our body’s chance to repair and recover. If you’re not getting enough sleep, you don’t recover, have a tendency to eat more, have impaired glucose control, and are likely to have higher Cortisol levels.

The solution:

Avoid the scale -
Like many others, I recommend limited use of the scale only to track patterns in weight gain or loss. Scales can be highly inaccurate measures and vary up to 10 lbs per day depending on our size. Unless you are severely overweight, there are better measures. If we only watch the scale, we risk losing the right kind of weight for the wrong kind.

Body Composition -
We know it’s possible to be at a “healthy weight” and have a high bodyfat percentage and that it’s possible to be “overweight” and have a low bodyfat percentage. There are hundreds of pictures of people that have gained weight yet become slimmer by building muscle. Even if the goal is to lower your weight, there needs to be a focus on building and maintaining muscle to keep burning calories. The result of losing muscle is a soft physique with less than ideal metabolism.

Hip & Waist Measures -
While body composition is one of the best, tracking changes in hip and waist circumference (two places we all tend to store fat) is a good indicator of our training and diet progress. There is also a high correlation of disease associated with people that have a high waist to hip ratio.

Tracking -
Track what you are eating, not necessarily taking calorie count as being exact, but understanding it is a range. When you find how much you can eat and maintain your weight for a week, decrease your calories by a minimal amount, say 10%. If you aren’t active, add some activity. No fancy gym necessary, but some basic bodyweight work to start.

Use the scale to track for weight changes, knowing that your weight can fluctuate +/- 10 pounds every day depending on your size. I like to keep a running five-day average, which will allow for those daily fluctuations.

Track progress using a variety of tools:  clothing fit, tape measure, progress photos, general feelings throughout the day. If two or more measures are moving in the right direction, you’re making progress, even if the scale isn’t moving.

Patience -
Be patient. Understand that most changes takes several weeks to show up and that good, lasting progress will take time, so if your goal is to be “bikini body” ready in 6 weeks, it may be time to re-think and re-plan.

Be patient through the failures, the slip-ups, and the lack of progress. Each time we don’t move forward is an opportunity to learn and make progress. Each opportunity allows us the chance to figure out to do it better and how to forgive ourselves when we make mistakes.

Thursday, June 25, 2015

The 1,200 Calorie Myth

The other day I encountered another poor soul led to believe that she must eat 1,200 calories per day in order to lose weight. After explaining why she was incorrect and how she'd been misled by the internet, I decided it was time to see how many cases actually line up with 1,200 calorie diets. Before I dive into the math behind this, I freely admit there are exceptions to every rule in fitness. The odds of someone being one of the exceptions is very small.

Weight loss can be simplified to a single statement, "eat fewer calories than you burn." Whether you perform exercise to raise your caloric burn level or you reduce your intake, weight loss occurs at a deficit. The bad news is that too big of a deficit results in muscle loss, hormonal damage, and metabolic slowdown. The end result is making weight loss harder. There are always exceptions in health and fitness, but chances are, needing 1,200 calories to lose weight isn't because of their body, but because of what they have done to their body.

It is suggested that the caloric deficit not exceed 500 calories below maintenance. Under the assumption that one must eat 1,200 calories to lose weight, that would mean the number of calories needed for maintenance is 1,200 + 500 = 1,700. With the simple multipliers used to convert RMR into TDEE, we can determine the corresponding RMR's.  The following table displays the five measures of activity along with the corresponding RMR that matches a TDEE of 1,700.

ActivityMultiplierCalories
Sedentary1.21,417
Light1.31,308
Moderate1.551,097
Heavy1.6251,046
Very Heavy1.9895

This simple analysis gives us two cases where 1,200 calories is below RMR. This is exquisitely bad over a long period of time as it is typically not sustainable, slows metabolism, slows growth and repair of tissue, and negatively effects hormone levels. The remaining three demonstrate an RMR highly unlikely to be found by anybody working out at the required level to reach a TDEE of 1,700.

In order to test large amounts of hypothetical data, I created a program to calculate RMR and BMI based on a set of conditions. The program was run with the following limitations:

Age: 18 - 64
Height: 4'11" - 6'0"
Weight: 103 -250 pounds

The test program reported no instances of a sub 1000 calorie RMR that would not be considered "Underweight." Further, of the 97,384 potential combinations based on the restrictions, there are 8% (7,703) cases of RMR between 1,000 and 1,200, with approximately 2% having a BMI classified as "Overweight" and .05% considered "Obese." Of those 2,030 cases, all of them are under 5'4" and older than 34 with the "Obese" starting at age 54. The lightest bodyweight meeting these qualifications is 129 pounds for a 4'11", 34 year old ranging up to a 146 pound, 5'4", 64 year old. If we look at RMR from each factor, RMR decreases with age and increases with weight. As weight typically increases with height, it can be seen that as height increases, so does RMR.

Again, the chances that the average female looking to lose weight falls into "1,200 calorie diet" are very slim.

As the calculations found, there are some exceptions to the "1,200 calories is not for you" rule, but chances are you aren't one of them. One exception is the person that has already damaged their metabolism by chronically under-eating. This metabolic slowdown may result in needing to eat 1,200 calories, but through proper diet, this can be reversed back to a more sustainable level. Another exception would be someone on a prescription medicine that impairs metabolic rate. The only other exception I will mention is under the direct care of a medical professional and they will have very specific reasons and guidelines for using the 1,200 calorie diet.

How Can I See Where I Am?

First, we need to find our RMR. From there, we can find our TDEE. Many calculators refer to BMR which is a very strict hospital monitored  measurement of the RMR and is typically slightly lower than RMR formulas estimate. In my opinion, BMR is not relevant unless you literally sit in bed and do absolutely nothing all day. While no formula is perfect for everybody, there are two that have the best RMR predictions for the largest population. Mifflin-St Jeor is the most recent formula developed and demonstrated a greater accuracy than previous formulas. Harris-Benedict is the second formula and is still used by many of the online calculators. In order to calculate the TDEE, the RMR is multiplied by an activity quotient. You can use the Z Strength Calculator to determine your RMR and TDEE and save yourself some time.

Now that we know our minimum (RMR) and maintenance (TDEE), we can create our deficit. The deficit should not force you below your RMR and should be no more than 500 calories below TDEE. I'm willing to bet fewer than five people reading this will calculate 1,200 calories as an appropriate deficit and remain above their RMR. In a perfect world, we would increase the space between our RMR and our TDEE by increasing activity, allowing us to lose weight while eating the most calories possible.

Again, if we eat too far below our TDEE, we risk slowing our metabolism, making it harder to lose weight. When this happens, the standard response is either a) eat less or b) be more active. Both options create a bigger deficit forcing the body to slow metabolism further. Remember, the human body has learned to survive over thousands of years and it will compensate to survive.

Regarding the Program Used to Gather Data

Using the limitations, the program calculated more than 97,000 combinations, finding fewer than 8,000 that resulted in an RMR of 1,200 or lower. In an attempt to relate these numbers to a common factor, it also calculated the BMI (Body Mass Index) for each of the combinations. The majority of these combinations resulted in a BMI below 22, which is well within the "Normal" range. While many of us agree BMI is a bad tool because more muscular people rank as "Overweight" or "Obese", it is a useful tool for the less muscular developing weight loss goals.