Examples of common reasons why metabolic rates decrease:
- low thyroid hormone
- your history of dieting
- your size and body composition
- your activity level
- lack of sleep
We’ll briefly touch on each one below and we promise to give you better advice than just to “eat less and exercise more”.
Low thyroid hormones
Your thyroid is the master controller of your metabolism. When it produces fewer hormones, your metabolism gets throttled. The thyroid hormones (T3 & T4) tell the cells in your body when to use more energy and become more metabolically active. Ideally it should work to keep your metabolism just right, but there are several things that can affect it and throw it off course. Things as complicated as autoimmune diseases or as simple as mineral deficiencies (e.g. iodine or selenium) for example.
Tip: Talk with your doctor about having your thyroid hormones tested.
Your history of dieting
When people lose weight, their metabolic rate often slows down. This is because the body senses that food may be scarce and attempts to adapt by trying to continue with all the necessary life functions with less food. While dieting can lead to a reduction in amount of fat, it unfortunately can also lead to a reduction in the amount of muscle you have. As you know, more muscle means faster resting metabolic rate.
Tip: Make sure you’re eating enough food to fuel your body without overdoing it.
Your size and body composition
In general, larger people have faster metabolic rates. This is because it takes more energy to fuel a larger body than a smaller one. However, you already know that gaining weight is rarely the best strategy for increasing your metabolism. Muscles that actively move and work need more energy. Even muscles at rest burn more calories than fat. This means that the amount of energy your body uses depends partly on the amount of lean muscle mass you have.
Tip: Do some weight training to help increase your muscle mass.
Your activity level
Aerobic exercise temporarily increases your metabolic rate. Your muscles are burning fuel to move and do “work” and you can tell because you’re also getting hotter. Even little things can add up. Walking a bit farther than you usually do, using a standing desk instead of sitting all day, or taking the stairs instead of the elevator can all contribute to more activity in your day.
Tip: Incorporate movement into your day. Also, exercise regularly.
Lack of sleep
There is plenty of research that shows the influence that sleep has on your metabolic rate. The general consensus is your body needs 7-9 hours of sleep every night.
Tip: Try to create a routine that allows at least 7 hours of sleep every night.
Recipe (Selenium-rich): Chocolate Chia Seed Pudding
Serves 4
- ½ cup Brazil nuts
- 2 cups water
- nut bag or several layers of cheesecloth (optional)
- ½ cup chia seeds
- ¼ cup unsweetened cacao powder
- ½ teaspoon ground cinnamon
- ¼ teaspoon sea salt
- 1 tablespoon maple syrup
Blend Brazil nuts in water in a high-speed blender until you get smooth, creamy milk. If desired, strain it with a nut bag or several layers of cheesecloth.
Add Brazil nut milk and other ingredients into a bowl and whisk until combined. Let sit several minutes (or overnight) until desired thickness is reached.
Serve & Enjoy!
Tip: Makes a simple delicious breakfast or dessert topped with berries.
References:
http://www.precisionnutrition.com/metabolic-damage
http://www.precisionnutrition.com/thyroid-and-testing
http://www.precisionnutrition.com/all-about-energy-balance
https://authoritynutrition.com/6-mistakes-that-slow-metabolism/
https://authoritynutrition.com/10-ways-to-boost-metabolism/
http://summertomato.com/non-exercise-activity-thermogenesis-neat