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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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What happens if your B12 is dangerously low?

A vitamin B12 deficiency can cause megaloblastic anemia. Megaloblasts are immature red blood cells that are larger than normal. They usually have an odd shape, too. When you have anemia, your red blood cells have trouble getting oxygen to your tissues and organs.

webmd.com - What Happens if Your B12 Deficiency Is Left Untreated? - WebMD

Your red blood cells, nerves, and brain all depend on vitamin B12. But some people don’t get enough of this nutrient. When left untreated, a B12 deficiency can cause a number of health problems. Some are mild while others are more serious. Certain groups are more likely than others to have really low levels. Sometimes you may have a deficiency and not know it. You might want to ask your doctor to check your B12 levels if you fit any of the following:

You’re vegan or strict vegetarian.

You have an inflammatory bowel disease, like Crohn’s or ulcerative colitis.

You have celiac disease.

You’re older than 50.

You’ve had surgery on your stomach.

You have a family history of pernicious anemia.

A simple blood test can show if your B12 levels aren’t where they should be. Treatment, including shots or supplements, can help you get healthy. But if you ignore your deficiency, here are some of the things that can happen.

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