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Are you skinny if you have a fast metabolism?

A fast metabolism does not necessarily lead to thinness. In fact, studies show that people with overweight/obesity often have fast metabolisms. Their bodies need more energy to keep basic body functions going.

my.clevelandclinic.org - Metabolism: What It Is, How It Works and Disorders

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Overview

What is metabolism?

Metabolism refers to the chemical (metabolic) processes that take place as your body converts foods and drinks into energy. It’s a complex process that combines calories and oxygen to create and release energy. This energy fuels body functions.

What does your metabolism do?

Your metabolism never stops, even when your body is at rest. It constantly provides energy for basic body functions, such as:

Breathing.

Circulating blood.

Digesting food.

Growing and repairing cells.

Managing hormone levels.

Regulating body temperature.

What is the basal metabolic rate (BMR)?

Your basal metabolic rate (BMR) refers to the minimum number of calories your body needs to function while you’re resting. This amount varies from person to person. Your BMR fulfills 60% to 70% of the energy your body uses. Rapid weight loss and aggressive calorie restriction decrease your BMR — this is one reason why weight loss is usually not linear and may stall at some point.

How does the body use the rest of its energy?

Your body uses about one-tenth of its energy to process food into fuel. The remaining energy fuels your physical movement.

How does metabolism affect weight?

Many people blame metabolic problems for weight struggles. But your metabolism naturally regulates itself to meet your body’s needs. It’s rarely the cause of weight gain or loss. In general, anyone who burns more calories than they take in will lose weight.

What’s the difference between a fast metabolism and slow metabolism?

Someone with a fast metabolism or fast BMR burns a lot of calories even while at rest. If you have a slow metabolism or slow BMR, your body needs fewer calories to keep it going. A fast metabolism does not necessarily lead to thinness. In fact, studies show that people with overweight/obesity often have fast metabolisms. Their bodies need more energy to keep basic body functions going.

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Does a fast metabolism make you age faster?

podiumrunner.com - Does a High Metabolism Make You Age Faster? - PodiumRunner

A new study accepted for publication in the Journal of Clinical Endocrinology & Metabolism claims that people with higher metabolic rates age faster and die younger than people without them, Science Daily reports. “We found that higher endogenous metabolic rate, that is how much energy the body uses for normal body functions, is a risk factor for earlier mortality,” said the study’s lead author, Reiner Jumphertz, according to Science Daily. This conclusion only applies to resting metabolic rate, not to energy expended during exercise. Researchers evaluated 652 healthy Pima Indian volunteers. They tested 24-hour energy expenditure (energy expended at rest, as determined in a respiratory chamber) in 508 volunteers and resting metabolic rate in 384 of the volunteers over a period of 11 to 15 years. During the study period, 27 participants died of natural causes. Researchers linked higher energy expenditure with an increase in risk for natural morality. The findings may explain, Jumphertz said, why “reductions in metabolic rate, for instance via low calorie diets” may benefit human health. Before you start jumping around thrilled that you will live longer than your naturally skinny friends who can eat anything because they have high metabolisms, consider this: a study highlighted in Science Daily in 2009 found exactly the opposite, although the test subjects were mice. The study, published in 2009 in the journal Physiological and Biochemical Zoology, found that mice with high metabolisms live just as long as those with slower metabolisms. I seems to me like the study with Pima Indian volunteers was of such small scope–both numerically and ethnically–that it hardly can be deemed conclusive. So party on, those of you who feel lucky to have high metabolisms. It might be a while before scientists decide your metabolism is or isn’t a blessing.

What do you think?

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