Most people think that metabolism peaks in our teenage years and then declines steadily as we get older. However, a new study published in the journal Science suggests that this is not the case.

The study, which was led by researchers at Duke University, found that metabolism actually peaks in infancy, then slows by about 3% each year until we reach our 20s. After that, it levels off and remains stable for decades.

The researchers were surprised by these findings, as they had expected to see a more gradual decline in metabolism with age. They believe that the reason for the plateau in metabolism in our 20s is due to the fact that our bodies are still growing and developing during this time.

After our 20s, metabolism starts to decline again, but at a much slower rate than previously thought. The study found that people in their 90s need 26% fewer calories each day than someone in midlife.

The reasons for the decline in metabolism in old age are not fully understood, but they are thought to be due to a number of factors, including:

• Loss of muscle mass: As we age, we lose muscle mass, which is metabolically active tissue.
• Decreased activity levels: Many people become less active as they age, which can also contribute to a decline in metabolism.
• Changes in hormones: Changes in hormones, such as testosterone and estrogen, can also affect metabolism.

The decline in metabolism with age can make it more difficult to maintain a healthy weight. However, there are things that you can do to help slow the decline, such as:

• Staying active: Exercise is one of the best things you can do to boost your metabolism. Aim for at least 30 minutes of moderate-intensity exercise most days of the week.
• Eating a healthy diet: Eating a healthy diet that is low in calories and high in nutrients can help you maintain a healthy weight and keep your metabolism revved up.
• Managing stress: Stress can lead to weight gain and a decline in metabolism. Find healthy ways to manage stress, such as exercise, yoga, or meditation.

By following these tips, you can help slow the decline in metabolism with age and maintain a healthy weight.

In addition to the study published in Science, other research has also shown that metabolism changes with age in different ways than previously thought. For example, a study published in the journal Nature Metabolism found that the amount of muscle tissue in the body declines more rapidly in women than in men. This is one reason why women are more likely to gain weight and develop obesity as they get older.

Another study, published in the journal Cell Metabolism, found that the way our cells use energy changes with age. As we get older, our cells become less efficient at using energy, which can lead to weight gain and other health problems.

The research on metabolism and aging is still ongoing, but it is clear that our metabolism does not decline as steadily as we once thought. By understanding how metabolism changes with age, we can take steps to slow the decline and maintain a healthy weight.