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“I never put on weight whatever I eat. Guess I just have a really fast metabolism.” If you’ve ever heard this and rolled your eyes—or simply wondered what it actually means—you’re not alone.

Your body’s metabolism can play a vital role in maintaining a healthy weight. If you’re underweight according to a body mass index calculator—and a health care professional has ruled out an underlying medical problem—a super-efficient metabolism might be the cause.

Read on to find out more about metabolism and what to do if you want to gain weight healthily or bulk up a little.

What Is Metabolism?

The most important thing you can do to gain weight is to create a calorie surplus, but using healthy foods
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Giles Yeo, a principal research associate at the Institute of Metabolic Science at the University of Cambridge, describes metabolism as “one of the steps in which we take to extract energy from food.

“There are two steps. The first step is digestion. We eat and it gets down to the gut. And the nutrients are then transferred across the gut wall: carbs, fats, sugars.

“Metabolism is the breaking down of these nutrients within the cell into energy. And people can have faster and slower metabolism—more or less efficient metabolism.”

Despite the great advances in scientists’ understanding of how the human body works, Yeo explains that there is still more to learn about metabolism.

Feet on bathroom scale with tape measure
Feet on bathroom scale with tape measure. If you think you might be underweight, try a body mass index calculator.
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“Is metabolism on average fully understood? Pretty much. Is the difference between your metabolism and my metabolism and a Polynesian’s metabolism or a South Asian’s metabolism fully understood? No,” he said.

The process can also be difficult to measure.

“This is unlike food intake and genetic differences, about which more is known, because eating food is a physical thing you can weigh—it’s how much are you eating. The problem with metabolism is that you have to measure it,” Yeo added.

Metabolism is measured either through the output of heat, or via the outputs of a change in ratio of carbon dioxide to oxygen. This can be done precisely and accurately on an individual. Broadening such studies can be tricky, according to Yeo.

“The biological difference, the genetic differences between people, you need to be able to measure metabolism accurately. But at scale—tens of thousands, hundreds of thousands of people.”

How to Gain Weight With a Fast Metabolism

A skinny man with a fast metabolism
A skinny man kissing his biceps. If weight gain is a priority, combine a balanced diet with exercise.
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Although some people do have faster, or more efficient, metabolisms than others, the differences are less pronounced than is commonly thought.

“The biggest difference in your body weight is still going to be based on food intake rather than a metabolism, purely because we are designed to eat food a lot quicker than we are designed to burn energy. Because it’s what’s kept us alive,” he said Yeo.

Binging on chips and chocolates on your sofa may help you to put on pounds, but a diet high in saturated fats won’t do much for your health. It’s important to be active too.

“If you want to gain weight safely, then you want to gain weight with a balanced diet. Do physical training while eating well, because then the energy is more likely to be put into lean mass, rather than into your fat,” he explained .

“If you’re exercising, you’re exercising your muscles. And so it’s going into building the muscles. If you are sedentary, what you eat will be stored primarily as fat.”

Woman measures very thin waist with measuring
Woman measures very thin waist with tape. Eating disorders can lead to unhealthy weight loss.
Ralf Geithe/Getty Images

Not everyone attempting to gain weight is looking for a six-pack or athletic build. People recovering from serious illnesses often need a nutritionist’s help to regain the pounds they have lost. Conditions that can cause unhealthy weight loss include thyroid problems, celiac disease, diabetes and cancer—as well as eating disorders and depression.

Cancer cells, for example, require more energy than healthy cells, so a cancer patient can be burning more calories when they are at rest. Many sufferers also experience nausea and loss of appetite linked to their cancer or to chemotherapy. People with cancers of the mouth or throat may find chewing or swallowing painful.

Yeo believes protein shakes can be an excellent option in these circumstances, despite saying: “I used to be very rude about them.”

He added: “It is more efficient to have the protein shakes and protein powders because you can get a lot more protein. The other reason you may choose to use protein shakes is they deliver the protein into you relatively evenly throughout the day.”

Protein shakes can also help older people who find themselves losing weight through simple loss of appetite—putting their health at risk. Yeo said: “You begin to lose muscle mass and so supplementation when you’re old can also be helpful.”

Two happy and fitess seniors doing exercise
Two older people exercising in a gym. It’s not uncommon to lose your appetite in later life, but you can keep your weight healthy if you eat well and stay active.
Fabio Camandona/Getty Images

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