What is Metabolism?

MetabolismThis word “metabolism” is thrown around a lot these days.

You know that if yours is too slow you might gain weight.  But what exactly does this all mean?

Well, technically, “metabolism” is the word to describe all of the biochemical reactions in your body.  It’s how you take in nutrients and oxygen, and use them to fuel everything you do.

Your body has an incredible ability to grow, heal, and generally stay alive.  And without this amazing biochemistry you would not be possible.

Metabolism includes how the cells in your body:

  • Allow activities you can control (e.g. physical activity etc.).
  • Allow activities you can’t control (e.g. heart beat, wound healing, processing of nutrients & toxins, etc.).
  • And also allow storage of excess energy for later.

So, when you put all of these processes together into your metabolism, you can imagine that these processes can work too quickly, too slowly, or just right.

Which brings us to the “metabolic rate”.

Metabolic rate

This is how fast your metabolism works, and is measured in calories (yup, those calories!).

The calories you eat can go to one of three places:

  • Work (i.e. exercise and other activity).
  • Heat (i.e. from all those biochemical reactions).
  • Storage (i.e. extra leftover “unburned” calories stored as fat).

As you can see, the more calories you burn as work or creating heat, the easier it is to lose weight and keep it off, because there will be fewer “leftover” calories to store for later.

There are a couple of different ways to measure metabolic rate.  One is the “resting metabolic rate” (RMR), which is how much energy your body uses when you’re not being physically active.

The other is the “total daily energy expenditure” (TDEE), which measures both the resting metabolic rate, as well as the energy used for “work” (e.g. exercise) throughout a 24-hour period.

What affects your metabolic rate?

In a nutshell: a lot!

The first thing you may think of is your thyroid.  This butterfly shaped gland at the front of your throat releases hormones to tell your body to “speed up” your metabolism.  Of course, the more thyroid hormone there is, the faster things will work and the more calories you’ll burn.

But that’s not the only thing that affects your metabolic rate.

How big you are counts too!

Larger people have higher metabolic rates; but your body composition is crucial!

Muscles that actively move and do work need more energy than fat does.  So, the more lean muscle mass you have, the more energy your body will burn, and the higher your metabolic rate will be.  Even when you’re not working out.

This is exactly why weight training is often recommended as a part of a weight loss program.  Because you want muscles to be burning those calories for you.

The thing is, when people lose weight, their metabolic rate often slows down, which you don’t want to happen.  So you definitely want to offset that with more muscle mass.

Aerobic exercise also temporarily increases your metabolic rate.  Your muscles are burning fuel to move so they’re doing “work”.

The type of food you eat also affects your metabolic rate!

Your body actually burns calories to absorb, digest, and metabolize your food.  This is called the “thermic effect of food” (TEF). You can use it to your advantage when you understand how your body metabolizes foods differently.

Fats, for example, increase your TEF by 0-3%; carbs increase it by 5-10%, and protein increases it by 15-30%.  By trading some of your fat or carbs for lean protein, you can slightly increase your metabolic rate.

Another bonus of protein is that your muscles need it to grow.  By working them out and feeding them what they need they will help you to lose weight, and keep it off.

And don’t forget the mind-body connection.  There is plenty of research that shows the influence that things like stress and sleep have on the metabolic rate.

This is just the tip of the iceberg when it comes to metabolism and how so many different things can work to increase (or decrease) your metabolic rate.

References:

The post What is Metabolism? appeared first on No Limits Fitness.

About No Limits

No Limits Fitness provides step-by-step programs to help busy adults get the body they’ve always wanted, without restrictive diets or time-consuming workouts, so they can lead more fulfilling lives. Life is a much better experience in a strong, healthy body!

Recent Posts

The Single Biggest Predictor of Success With Your Fitness

By Juan Perez • 03 May, 2024
Every year millions of people make the resolution to improve their fitness. It’s not exactly a secret that the majority of these good intentions will quickly turn into empty promises. When you first get started, your excitement and energy are high and it’s easy to feel like you’re in control and that your will power alone will help you through the difficult days ahead. The reality is that you’ll probably have more days when you don’t “feel” like training. This is the reason we preach Standards Over Feelings because we understand how fundamental this is for human behavior. There have been several studies on human behavior that have helped identify the single biggest predictor of success when it comes to long-term consistency with your fitness. It’s not keeping a gym bag ready and with you at all times…although this helps. Setting your gym clothes out the night before is a great idea…but it’s still not the determining factor. Surprisingly it’s not even having an accountability partner. Schedule in advance when and where you’ll do your training. Everything else is simply in support of this habit. Being accountable to someone you don’t want to disappoint is incredibly helpful, but if you haven’t taken that first step, accountability falls short. Having been that accountability piece for hundreds of people, I’ve been ignored and ghosted more times than I can count. Even my sister stopped responding to text messages and phone calls at one point. (I called our mother but apparently you can’t put an adult on restriction). Scheduling in advance WHEN and WHERE you’ll workout is the single most important step to developing consistency with your fitness. This helps you develop integrity with yourself…if you say you’ll do something, that thing gets done. Period. Show up like a boss and bosses don’t cancel. Your training is time on your calendar dedicated to getting better. The workouts on your calendar become non-negotiable. You don’t wake up and see how you “feel” because you already know there will be days you don’t “feel” like it. In advance, you schedule your training where it best fits into your life with your responsibilities. Once you’ve planned your work, you show up and work the plan. If you fail to plan the work, you’re significantly increasing the likelihood of failure. Ask someone that has been remarkably consistent with their fitness if they know when and where they’ll workout.  This has already been decided. Their feelings aren’t involved in the process. If you truly want to be consistent with your fitness, this habit is a must: Schedule in advance when and where you’ll workout.

Crunch-Free Zone: 5 Exercises For Stronger Abs

By Will Matthiessen • 19 Apr, 2024
Crunches.  The go-to core exercise for a lot of gym goers. Yet, it’s one of the worst ab exercises you can do. Shocking, I know. You’re probably wondering why it’s one of the worst. Crunches put force on your spine and oftentimes strain on your neck. They force your spine into flexion, which is generally what people are told not to do in order to protect their back. Aside from the pressure it puts on your spine, crunches don’t activate your core muscles to the extent that a lot of other dynamic core exercises do. If your goal is to have sculpted abs like a lifeguard on Baywatch, crunches are not your solution. Aside from the aesthetic aspect, a strong core is important for your body’s balance and stability, posture, and reduction of back pain and other injuries. If you want to develop a rock hard core, here is a list of exercises better than the old fashioned crunches that you can start incorporating into your workouts: The Hard Style Plank Put your forearms on the ground and your arms set shoulder width apart. Your arms should be parallel to your body. Once you’re up in the plank, imagine squeezing your elbows to your knees and your knees to your elbows. Don’t be surprised if you start shaking like a leaf as soon as you create that tension. Dead Bugs Lie on your back with your arms straight up and your hands above your shoulders. Bend your legs at a 90-degree angle with your toes facing up at the ceiling. Imagine pushing your belly button into the ground and keeping your body tight enough to where if someone was pulling on your limbs, you’d be able to resist it. Next extend your right arm and left leg at the same time, without touching the ground. Keep pushing your belly button into the ground to avoid arching your back. The right leg that is still bent should stay completely still while the other leg is in motion. Bring your arm and leg back into the start position and then switch sides. When it comes to Dead Bugs, one of our favorite sayings applies: “Slowly is holy. Faster is disaster.” If you want to increase the intensity, add a kettlebell to the stationary arm. If you want to significantly increase the intensity, press the kettlebell once you’ve reached the fully extended position. Reverse Crunches Lie down flat with your back on the floor and your legs straight down, toes pointed up. Press your lower back into the floor and pull in your belly button as you lift your legs together up off the floor. Push your heels through the ceiling at the top and slowly lower them back to the ground. Fun, right? Double Kettlebell March Hold two heavy kettlebells in the racked position. Pull your belly button to your knees and your knees to your belly button to find max tension in your core. Once you feel that tension, slowly lift one knee up 90 degrees and then switch legs. Hollow Rocks I’ve saved the worst (I mean best) for last. Lay down on the ground with your legs a little bit off of the ground as well as your shoulder blades and head. With arms extended over your head, rock back and forth like a banana rocking back and forth on a counter. Or a see-saw…take your pick. Alright, now that I’ve given you the secret sauce to getting rock hard abs, it’s time to get to work people!

How To Lose Weight Without Counting Calories

By Juan Perez • 05 Apr, 2024
One of the first recommendations you’ll hear for someone wanting to lose weight is to begin by counting calories. Although weighing your food and counting calories does work for some people, the reality is that this approach to weight loss has an astonishingly high failure rate. If this strategy is “based in science”, why does it fail more than 95% of the time? The Top 3 Issues With Counting Calories The number of calories in the foods you eat are estimates. This is where the concept of counting calories being “based in science” can be misleading. The FDA allows companies to use 5 different formulas to estimate calories and a standard deviation up to 20% is acceptable. This means that something listed as 150 calories exists on a range between 120 calories and 180 calories. How ripe is your banana? The ripeness affects caloric availability. The second issue is that as individuals we each absorb a different amount of the calories from the food we consume. Thirdly, Americans are notoriously bad at determining healthy portion sizes. Our super-sized culture has heavily influenced our concept of a normal sized portion. The good news is that there is another way to lose weight without counting calories. The Three Pillars of Nutrition Whether or not you’re a card-carrying member of Camp Calorie Counters, the foundation of your nutrition is built upon three pillars: Food Quality, Food Quantity and Food Timing. Food Quality All calories are not created equal. The popular 100 calorie snack bags do not offer the same nutritional value as 100 calories from fruits or vegetables. When the majority of your meals are composed of minimally processed single ingredient whole foods (lean protein, fruits and vegetables), you’re more likely to get the micronutrients your body needs to thrive. Food Quantity As mentioned earlier, Americans aren’t known for our skills at eyeballing healthy portion sizes. Although using a food scale to determine portion sizes can be helpful, it isn’t always practical. This is the reason we recommend learning to use your hand as a guide to determine portion sizes. You can’t take a food scale with you everywhere you go but you’re always allowed to bring your hands!
Show More
Share by: