Your metabolism starts slowing down at age 18, and other facts about a widely misunderstood process
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Most of the energy you burn is from your resting metabolism.
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It is in every cell in your body. It refers to a series of chemical processes in each cell that turn the calories you eat into fuel to keep you alive.
The body's major organs — the brain, liver, kidneys, and heart — account for about half of the energy burned at rest, while fat, the digestive system, and especially the body's muscles account for the rest.
Metabolism can vary a lot between people, and researchers don't understand why.
2 people with the same size and body composition can have different metabolic rates. One can consume a huge meal and gain no weight, while the other has to carefully count calories to not gain weight.
Getting older slows down the metabolism.
The effect happens gradually, even if you have the same amount of fat and muscle tissue. So when you're 60, you burn fewer calories at rest than when you're 20.
There's a lot of hype around" speeding up your metabolism for weight loss, but that's just a myth.
While there are certain foods (coffee, chili, and other spices) that may speed the basal metabolic rate up just a little, the change is so negligible and short-lived, it would never have an impact on your waistline. Building more muscles, however, can be more helpful.
Drastic dieting can slow down your metabolism. This may be the body's way of vigorously defending a certain weight range, called the set point.
Researchers don't fully understand why this metabolic slowdown happens though.
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Not everyone overeats and becomes overweight, and not everyone who becomes overweight or obese develops illnesses like diabetes or heart disease.
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HIIT workouts generally combine short bursts of intense heart-pounding exercise (during which a person’s heart rate reaches at least 80 percent of its maximum capacity, usually for 1 to 5 minute...
...has to do with heart health: Intervals can boost cardio-respiratory health with a smaller time investment compared to continuous forms of exercise.
It's not about superior fat-burning capacity or bigger muscles, but about improved VO2 max, a measure of endurance that calculates the maximum volume of oxygen the body can use.
VO2 max is one of the best predictors of overall health.
People can burn comparable amounts of calories in HIIT routines lasting, compared to longer continuous exercise routines. But this doesn't mean that calorie burn translates into weight loss.
This is the problem with HIIT, just like with any other form of exercise: it’s much easier to lose weight by cutting calories in your diet than trying to burn excess calories.